Proportional flow controller, method, dwelling-side unit, heating-service water system and building

Abstract

The invention relates to a proportional flow controller for use in a heating-service water system having a service water line and a heating water line, wherein: the service water line has a service water inlet, a measuring element and a service water outlet, and the heating water line has a heating water inlet, a valve and a heating water outlet; the measuring element has a deflection transmission surface which is operatively connected to a measuring chamber in the service water line and is designed to react to pressure and / or a flow impulse such that pressure and / or flow in the service water line cause the deflection transmission surface to deflect; the deflection transmission surface is mechanically connected to a deflection part; the deflection part has an operative connection to the valve; the deflection transmission surface acts upon a restoring spring during the deflection of the deflection part; a membrane seal having a sealing membrane is provided between the deflection part and a fixed housing part of the proportional flow controller; the fixed housing part has a cap which forms a deflection space around the space where the deflection of the deflection part takes place and / or around a restoring spring; and the cap has a mechanical anti-rotation element.

Description

[0001] Proportional flow controller, process, home station,

[0002] Heating-hot water system and building

[0003] The invention relates to a proportional flow controller, a method, a home station, a heating and domestic water system and a building.

[0004] In other words, the invention relates to various aspects of a technical concept in the field of heating and domestic water systems, in particular to a device for proportional control of flow rates within a heating and domestic water system. The focus is on the mechanically controlled interaction between a domestic water line and a heating water line, with both lines being linked via an integrated control unit in the form of a proportional flow controller. Such systems typically serve to supply individual residential units with heat and hot water, ensuring the most precise possible adjustment to individual consumption requirements while simultaneously maintaining hygienic standards and operational reliability.

[0005] The invention also relates to a heating-service water system for heating service water with a flow controller for regulating a heating water volume flow as a function of a service water volume flow requested at at least one tap.

[0006] The state of the art already features variously designed control systems for hydraulic flow control in such systems. In particular, mechanically responsive valve and diaphragm systems are known that react to pressure changes in the supply network and thus enable control of the respective branch flows. Nevertheless, technical challenges remain, including the reliable decoupling of the media flows, the dynamically precise control of the actuators, and the geometric modularity of the control components. Furthermore, simple assembly and the reduction of mechanical complexity are of great interest. DE 296 14 765 U1 discloses a flow controller (referred to throughout this patent application as a "proportional flow controller") and explains its use in two-way and three-way systems.

[0007] DE 202008 006054 U1 discloses a proportional flow controller with an O-ring sealing system.

[0008] EP 3 184 916 A1 discloses a proportional flow controller with a reduced working space.

[0009] A so-called PM controller that is widely known on the market is disclosed in DE 10 2016 008 097 A1.

[0010] All prior art documents cited here are understood to be “fully disclosed by reference” with regard to their complete disclosure content.

[0011] The invention is based on the object of providing an alternative or an enrichment to the state of the art.

[0012] For example, the object of the invention may be to create a technical solution that allows for proportional flow control in a compact manner while maintaining both structural integrity and functional expandability. At the same time, the invention may implement the mechanical connection of individual components, particularly in the area of ​​sealing technology and housing coupling, in a manner that allows for a maintenance-friendly and operationally stable design.

[0013] A1

[0014] This object is achieved according to a first aspect of the present invention by a proportional flow controller which is used in a heating and domestic hot water system and has two separate media lines, namely a domestic hot water line and a heating water line. The domestic hot water line comprises a domestic hot water inlet, a measuring element and a domestic hot water outlet, while the heating water line has a heating water inlet, an actuator and a heating water outlet. The measuring element is designed in such a way that it comprises a so-called stroke sensor surface which is operatively connected to a measuring chamber arranged within the domestic hot water line and reacts in response to pressure conditions or flow pulses of the domestic water. It is provided that such an application of the stroke sensor surface results in a translatory movement, i.e. a stroke.The stroke sensor surface is mechanically connected to a so-called stroke part, which in turn has a operative connection to the actuator of the heating water line. This creates a direct mechanical coupling between the flow in the domestic water line and the control position in the heating water line, achieving a proportional adjustment between the two lines.

[0015] During the stroke triggered by the medium, the stroke sensor surface acts against a return spring, which returns the valve to its original position once the pressure is removed. A diaphragm seal featuring an elastically flexible sealing diaphragm is provided between the stroke part and a stationary housing section of the proportional flow controller. This sealing device serves to guide the stroke part in a media-separated manner and ensures that no leaks occur in the flow paths. The stationary housing section, in turn, is provided with a cap, which forms the so-called displacement chamber, i.e. the volume range in which the stroke part is actuated during its movement and / or in which the return spring is housed. Finally, a mechanical anti-twist device is provided to prevent unintentional rotation of the cap relative to the rest of the housing.

[0016] The following terminology is used to explain this:

[0017] In the context of this application, the term "proportional flow controller" refers to a device for controlling the flow behavior in one medium line, in which the manipulated variable - typically a valve or a variable cross-sectional opening - is directly physically coupled to change a measurable flow variable in another line. The proportional flow controller therefore does not operate independently or with external electronic control, but rather is mechanically coupled and proportions in response to flow changes. The "domestic water line" is the part of the heating and domestic water system through which drinking water is piped for consumer purposes, in particular for decentralized hot water preparation. It typically comprises a supply line (domestic water inlet), a measuring section with optionally integrated measuring or control elements, and a discharge line to the consumer (domestic water outlet).One possible design of the process water line is a flow channel with a defined cross-section, in which the measuring chamber is also located.

[0018] The "measuring element" is a functional component that is in direct contact with the medium in the service water line and responds to physical properties of the medium, such as pressure or flow impulse. In a preferred design, the measuring element is a diaphragm surface or a piston element coupled to the stroke sensor surface.

[0019] The "stroke sensor surface" is a mechanically stressable surface element that is set into a stroke movement by applying medium pressure or flow force. The stroke sensor surface can be designed as a planar or curved surface, preferably elastically deformable, such as an elastomeric membrane or a metallic diaphragm plate.

[0020] The "stroke" refers to the translational movement of the stroke part resulting from the movement of the stroke sensor surface. The stroke is preferably guided linearly along an axis and generates a mechanical actuating force.

[0021] The "lifting part" represents the connecting link between the stroke sensor surface and the actuator. It transmits the movement caused by the medium to the actuator and can be designed as a rod, thrust element, or piston mechanism. Depending on the design, the lifting part can have a rigid or articulated coupling.

[0022] The "active connection to the actuator" means that there is a mechanical coupling through which the actuator is displaced or adjusted depending on the movement of the lifting part. The actuator itself can be designed as a valve cone, throttle valve, or slide. The "return spring" is an elastic element that generates a counterforce to the stroke and thus ensures a defined rest position of the lifting part. The return spring can be a coil spring, leaf spring, annular spring, or torsionally elastic element.

[0023] A "diaphragm seal" refers to a sealing device between the movable lifting part and a stationary housing part, in which an elastic sealing membrane is clamped in a radially or axially sealed manner. The diaphragm seal allows relative movement of the lifting part while maintaining the sealing function.

[0024] The "stationary housing" is the structural part of the regulator, in which the lifting mechanism is guided. It also serves as a bearing for the sealing diaphragm and the return spring.

[0025] The "cap" is a housing element that forms an interior space—the so-called displacement chamber—around the stroke part and, if applicable, the return spring. The cap can be designed as a mounted or screwed-in housing cover and fulfills protective, guiding, and fastening functions.

[0026] The "mechanical anti-twist device" refers to a technical measure for securing the cap in a defined position relative to the rest of the housing. This can be achieved, for example, through fitting grooves, locking teeth, asymmetrical contours, or screw positions.

[0027] A2

[0028] An optional version is characterized by the fact that the cap and the fixed housing part have an interoperating alignment aid.

[0029] This design represents an additional measure for precise assembly alignment and serves to ensure a defined positional relationship between the cap and the rest of the housing. A geometric coupling between the two components achieves precise positioning, preventing any misalignment and simultaneously ensuring reproducibility of the assembly position.

[0030] The following terminology should be explained: The "alignment aid" is a functional structural element that specifies or fixes the geometric orientation of two components relative to one another during assembly. The alignment aid can include a mechanical guide, such as a tongue and groove connection, a dowel pin hole, a locking lug with a counter-profile, or an asymmetrically designed positive fit that prevents twisting or tilting. The alignment aid can be an integral component of the cap and the stationary housing part or can be interposed as a separate element. A preferred embodiment provides an axial guide groove on the cap, which interacts with a corresponding guide web on the housing part. Alternatively, a coaxial toothing can also be provided, in which relative rotation is prevented by intermeshing tooth profiles.

[0031] One advantage of this design is the secure and precise positioning of the cap during assembly, which in turn supports the sealing function of the diaphragm seal and increases the mechanical strength of the entire regulator assembly. Furthermore, the clear orientation allows for subsequent disassembly and reassembly in the identical position, simplifying maintenance processes and reducing sources of error.

[0032] In conceivable variants, the alignment aid can also be combined with a locking function, so that audible or tactile resistance is overcome when the end position is reached. The alignment aid can also be provided with an optical marking that allows visual verification of correct alignment. In an alternative design, the alignment aid can also function as a bayonet lock, in which a defined rotational position is fixed by a locking mechanism. A combination of several alignment features, such as a tongue-and-groove guide combined with an additional locating pin, is also possible to make the assembly guide redundant and error-tolerant.

[0033] A3

[0034] An optional design is characterized by the cap having a tensioner, particularly a lever mechanism or a union nut, which interacts with the fixed housing part via a thread. This design contributes to the detachable yet force-locking attachment of the cap to the housing part and allows easy removal without tools or with minimal effort. The use of a tensioner optimizes the mechanical connection between the cap and the housing, particularly with regard to the preload of the diaphragm seal and accessibility for maintenance or replacement.

[0035] The following terminology is used to explain this:

[0036] A clamp is a mechanical device for axially pressing one component against another, preferably via a threaded connection. A union nut can serve as a clamp, which is screwed onto an external thread on the stationary housing part and presses a cap collar or flange area against the housing. Alternatively, a lever mechanism can be used, for example, in the form of an eccentric or a locking lever design, in which a preload is generated by a lever movement.

[0037] One advantage of this design is the easier assembly of the cap and the defined clamping force, which ensures a consistent sealing effect of the diaphragm seal. Furthermore, tool-free removal is possible, which is particularly important in tight installation spaces. The threaded connection also allows for sensitive adjustment of the preload.

[0038] The clamp can be designed as a knurled nut with gripping surfaces, a quick-release fastener with a spring mechanism, or a bayonet coupling. Combinations such as a union nut with a locking lug to prevent accidental loosening are also conceivable.

[0039] A4

[0040] An optional design is characterized by the fact that the cap has a collar and holds the sealing membrane with the fixed housing part on the outside, while the sealing membrane is held on the inside on the lifting part.

[0041] This design provides targeted fixation of the sealing membrane at two different connection points, which is particularly important for media-separated sealing with a simultaneously moving lifting part. The functional separation of the holding areas ensures defined clamping of the membrane on both the housing side and the side of the moving control element. This ensures that the sealing membrane is not displaced, distorted, or tilted in an uncontrolled manner during the lifting process of the lifting part. This not only increases the service life of the sealing element but also leads to permanent maintenance of the sealing effect under varying pressure conditions. Especially in the operation of a heating and domestic hot water system with frequent load changes, temperature gradients, and cyclical stress, the double-sided fixation of the membrane offers a significant improvement over conventional, single-sided membrane solutions.

[0042] The following terminology is used to explain this:

[0043] The "collar" is an area molded onto or applied to the cap, which is usually designed in a ring-shaped manner and forms a mechanical contact or clamping surface for other components. The collar can protrude axially or be offset radially and, in the design described here, functions as a holding element for the outer peripheral area of ​​the sealing membrane. The collar can be coupled to the membrane in a form-fitting, force-fitting or material-fitting manner, for example by means of a press connection, snap-in locking, screw clamping or by means of an integrally integrated sealing lip. In a particularly preferred design, the collar lies between the cap and the union nut, whereby the latter presses the sealing membrane against an annular bearing surface of the housing part when tightened.

[0044] The "sealing diaphragm" is a flexible, elastically deformable element that creates a fluid-tight seal between the media space between the moving lifting part and the stationary housing part. The diaphragm allows a certain degree of freedom of movement of the lifting part while simultaneously maintaining its sealing function. In this design, the diaphragm is held in two positions: on the outside of the housing part (in particular via the collar of the cap) and on the inside of the lifting part. The internal mounting on the lifting part can be achieved by clamping, gluing, shaped toothing, or by a separate fixing device, such as a groove with a retaining ring or stepped toothing with a retaining shoulder. The "external mounting on the stationary housing part" refers to the attachment point of the diaphragm at which it is fixed to a non-moving component using a force-fitting or form-fitting method.In the preferred embodiment, this fixation is achieved by the collar of the cap, which presses the sealing membrane against a flat sealing surface of the housing.

[0045] The "internal support on the lifting part" ensures that the innermost part of the sealing membrane remains firmly connected to the moving lifting part, so that the membrane is carried along during lifting movements and can deform in its elastic center without detaching from the component or shifting. This is essential to prevent wrinkling, leaks, or material fatigue.

[0046] A key advantage of this double-sided mounting is that the membrane always remains pre-stressed and its deformation occurs exclusively within the elastic range. This minimizes the risk of stress cracks, material aging due to overstretching, or abrasion due to frictional contact. The controlled stress distribution also significantly increases the fatigue strength of the sealing membrane, especially under cyclic loading caused by changing flow conditions, pressure surges, or thermal expansion.

[0047] In conceivable variants, the collar on the cap can be designed as a flanged metal ring enclosing a membrane made of elastomer or PTFE materials. A flat, laminated membrane can also be provided, the outer holding region of which is integrally bonded to the collar material, for example, by vulcanization, coextrusion, or overmolding. The internal fastening can be achieved by an axial groove in the lifting part, into which a plastic or stainless steel clamping ring is inserted. Alternatively, a clamping disc can be provided, which is pressed axially against the center region of the membrane, thus ensuring play-free fixation on the lifting part.

[0048] Combinations with other sealing elements such as support rings, centering lips, or secondary seals are also possible to further improve the mechanical stability and functionality of the sealing membrane. In a particularly preferred design, the two holding regions of the sealing membrane are each slightly curved, resulting in a uniform elastic deflection when pressure is applied, resulting in a particularly long-lasting lifting movement without material stress.

[0049] A5

[0050] An optional design is characterized by the fact that a union nut with an external knurling is provided as a tensioner, which engages around the collar of the cap and interacts with its internal thread with an external thread on the fixed housing part, so that the union nut, when tightened, strengthens the sealing effect of the diaphragm seal and at the same time strengthens the sealing membrane against twisting.

[0051] This design aims to achieve precise and repeatable clamping of the cap, while simultaneously optimizing the sealing effect and ensuring the diaphragm seal is held securely against twisting. The use of a union nut with external knurling allows for ergonomically simple handling, especially in confined spaces or in applications where tools are not recommended. Furthermore, the interaction of the union nut, collar, and external thread creates a positive connection that withstands both axial forces and twisting torques, thus permanently securing the positioning and functionality of the sealing membrane.

[0052] The following terminology is used to explain this:

[0053] The union nut is a ring-shaped connecting element with an internal thread that is screwed onto a corresponding external thread for the axial fixation of a component. In the context of this embodiment, it serves to force-fit the cap against the stationary housing part by pressing the collar of the cap into a defined contact position. The union nut can be made of metal or high-strength plastic and is preferably cylindrical or polygonal to enable manual or tool-assisted operation. The external knurling is a structured surface of the union nut, which ensures particularly good grip. It can be designed as a circular knurling pattern, as a knurled grip zone, or as a profiled outer contour (e.g., grooved, knurled, or with stepped grips).The external knurling makes it easier to tighten and loosen the union nut manually, especially if it is to be operated without tools.

[0054] In this design, the "cap collar" serves not only as a holding surface for the sealing membrane, but also as an axial stop for the union nut. The union nut engages over this collar and transfers a preload force to the sealing membrane via the contact surface.

[0055] The "internal thread of the union nut" is the screw thread cut into the inside of the ring body, which is screwed onto a corresponding "external thread on the stationary housing part." This threaded connection serves to transmit axial force between the two components. Depending on the design, it can be a metric ISO thread, a trapezoidal thread, or a fine pitch thread.

[0056] The sealing effect of the diaphragm seal is enhanced by the controlled pressing of the sealing diaphragm against the sealing seat. This is achieved by the axial force of the union nut, which is transferred via the collar of the cap and the diaphragm to the housing seat. Adequate preload prevents leakage and simultaneously ensures an elastically resilient sealing position.

[0057] The "twisting resistance of the sealing diaphragm" describes the effect of the annular clamping between the union nut, collar, and housing preventing rotational movement of the sealing diaphragm relative to the lifting part or the housing. This is particularly important under dynamic operating loads, as a twisting torque could otherwise impair the service life or function of the diaphragm.

[0058] A key advantage of this design is the easy readjustment of the preload by retightening the union nut, as well as the ability to perform assembly quickly and without tools. Furthermore, the even force distribution along the collar ensures a flat contact surface for the sealing membrane, which in turn helps prevent leaks or wrinkling.

[0059] In advantageous variants, the union nut can also be equipped with a locking device, such as an integrated spring latch, a locking pin, or a self-locking thread pitch. A torque limiting element can also be integrated to standardize the preload force. Likewise, the outer knurling can be provided with colored markings or tactile symbols to visually or haptically verify the correct installation position.

[0060] A6

[0061] According to a sixth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, characterized in thatthat the domestic water line also has a cross access.,

[0062] This design expands the proportional flow controller with an additional functional access point in the domestic water line, enabling increased variability and expandability of the controller architecture. The cross access can be used for numerous technical purposes, for example, for the integration of sensors, safety components, or maintenance elements, without disrupting or structurally modifying the main flow path. This results in increased flexibility in the controller's field of application and adaptability to specific system configurations. The following terminology is used to explain this:

[0063] The "cross access" is an additional opening or connection point on the service water line that is not aligned with the flow direction, but rather transversely or radially to the main flow direction of the medium. It serves as optional access to the interior of the line and can be used for retrofitting or factory integration of additional components. The cross access can be designed as an axially extending nozzle, a lateral sleeve, or a front-end opening.

[0064] A "domestic water line" in the sense of this definition is the part of the heating and domestic water system in which the drinking water for the user area circulates. The integration of a cross-inlet into this line requires particular technical care, as hygiene requirements, pressure conditions, and flow characteristics must be taken into account. The cross-inlet must not negatively influence the laminar flow and must be permanently sealed against the ambient pressure.

[0065] A key advantage of introducing cross access is the ability to install additional functional components directly on the regulator. This allows pressure sensors, temperature sensors, flow switches, or safety valves to be installed without creating separate installation points in the piping system. Furthermore, cross access allows for simplified flushing, venting, or cleaning of individual branch sections, reducing maintenance effort and improving operational reliability.

[0066] In preferred designs, the cross access can have a standardized connection thread, for example, an external thread of size V* or >2", allowing the direct use of commercially available screw connections and accessories. Alternatively, a quick-coupling system or a bayonet lock can be integrated. The cross access can be closed at the factory with a blind plug, which can be easily removed if necessary. It is also conceivable for the cross access to be equipped with a functional component from the outset, such as a combined temperature-pressure sensor or a flush valve with a non-return valve. In summary, the cross access significantly expands the application spectrum of the proportional flow controller and offers a structurally elegant solution for subsequent or application-specific adaptation of the controller to individual system requirements.

[0067] A7

[0068] An optional embodiment is characterized in that the transverse access has a transverse access nozzle, in particular having an external thread, wherein the transverse access nozzle is preferably closed fluid-tight with a threaded cap when not in use.

[0069] This design specifies the structural implementation of the previously described cross access and functionally implements it as a nozzle with an external thread. The cross access nozzle forms the technical interface between the domestic water line and external attachments or closure devices. The provided closure via a threaded cap ensures that no leaks occur when not in use, prevents foreign substances from penetrating the system, and simultaneously guarantees hygienic sealing. This results in a safe, flexible, and practical design that can be easily adapted to various applications.

[0070] The following terminology is used to explain this:

[0071] The "cross-access nozzle" is a tubular or sleeve-shaped attachment at the cross-access of the domestic water line, which preferably protrudes at right angles to the main flow direction. The nozzle enables the mechanical and hydraulic connection of external components such as sensors, valves, or connecting lines. In a preferred design, the cross-access nozzle is made of metallic or plastic-based material and is either an integral part of the housing or screwed on separately. The "external thread" on the cross-access nozzle is a standardized thread profile on the outside of the nozzle that allows connection with standardized screw fittings. This can be, for example, a cylindrical or tapered Whitworth thread, a metric ISO thread, or a special sanitary thread. The external thread serves both to accommodate a threaded cap and to connect to a functional component.

[0072] The "threaded cap" is a screwable closure element with an internal thread that can be screwed onto the external thread of the cross-access nozzle. The cap seals the nozzle fluid-tight and simultaneously protects it from mechanical influences, dirt ingress, and germ contamination. In a preferred design, the cap is made of corrosion-resistant plastic or stainless steel and can also include a seal, such as an O-ring or flat gasket.

[0073] A key advantage of this design is its ease of use: The threaded cap can be screwed on and off without tools, allowing for quick activation or deactivation of the cross access as needed. At the same time, the external threaded connector offers high connection compatibility with commercially available accessories, significantly increasing retrofitability.

[0074] In some variants, the cross-access nozzle can also be combined with an integrated backflow preventer, a filter insert, or an automatic vent. A self-draining design is also conceivable, in which the cap has a defined leakage opening to drain standing water when opened. In particularly hygiene-critical applications, the cap can also be sealable or equipped with a safety lock to prevent unauthorized opening.

[0075] Overall, the design with cross-access nozzle and threaded cap allows for modular expandability of the control system while ensuring operational reliability and hygienic safety - an advantage that is particularly important in modern, low-maintenance building technology systems.

[0076] A8 An optional version is characterized by the fact that the proportional flow controller has two cross accesses.

[0077] This version expands the previously described controller design by providing not just a single cross access, but two functionally similar or different cross accesses. This allows for increased functionality, flexibility, and redundancy in the controller's application. The two cross accesses can be used both in parallel—for example, for the simultaneous integration of various functional units—and sequentially, for example, for different operating modes, test cycles, or later upgrades. Furthermore, the two cross accesses can be arranged in different geometric positions or orientations, enabling optimal adaptation to structural conditions or specific system requirements.

[0078] The following terminology is used to explain this:

[0079] The "two cross accesses" are two independent additional access points to the service water line, which are not arranged in the longitudinal direction but rather transverse to its flow direction. They can, for example, be positioned opposite each other, laterally offset, axially staggered, or end-to-end. Both accesses are preferably designed with a cross access nozzle each, as described above.

[0080] One advantage of this design is the increased connection variety. For example, a first cross-access port can be equipped with a sensor, while the second is reserved for maintenance purposes. Alternatively, one access port can be equipped with a safety valve for normal operation, while the second is used for temporary venting or flushing. This also allows for the simultaneous integration of temperature and flow sensors without having to create additional installation locations in the pipe network.

[0081] The dual equipment also provides a degree of redundancy, so that in the event of a defect or scheduled maintenance at one access, the other access remains usable. This significantly increases the operational reliability of the entire system. In preferred designs, both cross accesses are equipped with identical external threads and each sealed with a threaded cap. Alternatively, different connection formats can be provided, for example, one cross access with a quick-release coupling, the other with a screw thread. Combinations with automatic pressure relief, check valves, hygiene locks, or integrated sensors are also conceivable.

[0082] In summary, the version with two cross accesses represents a particularly versatile, expandable and reliable variant of the controller, which offers optimal conditions for both current system requirements and future retrofits.

[0083] A9

[0084] An optional design is characterized in that the proportional flow regulator has exactly two cross inlets and that the two cross inlets are arranged coaxially on opposite sides of the proportional flow regulator and each have a half-inch thread to the outside and an open opening into the measuring chamber to the inside from the two opposite sides.

[0085] This design refines and substantiates the previously described variant with two cross ports, providing a symmetrical and precise coaxial arrangement of the ports. The term "coaxiality" implies a common axis along which the two cross ports are precisely opposite each other. This not only ensures a geometrically balanced design of the regulator, but also allows for particularly effective use of both ports for flow compensation, sensor placement, or bidirectional flow measurement. The connection via standardized half-inch threads further increases connection compatibility, while the open opening into the measuring chamber enables direct fluidic communication between the ports and the central regulator area.

[0086] The following terminology should be explained: The "exactly two cross accesses" are two clearly distinguishable connection points, explicitly defined in number and position. This is not merely a minimum number, but a specific definition of two access points for controlling, monitoring, or servicing the controller's interior.

[0087] The "coaxial arrangement on opposite sides" means that both cross ports are positioned along a common central axis and are located on exactly opposite surfaces of the regulator. This alignment enables uniform pressure conditions and a symmetrical installation pattern, which is particularly advantageous in series production or when mounted in confined housings.

[0088] The "half-inch thread" refers to a standardized connection thread in the 1 / 2-inch range, which is widely used in building services, especially in plumbing. It is preferably a cylindrical or conical Whitworth pipe thread, which allows for a robust, tight, and mechanically stable connection. The outer thread position facilitates the connection of commercially available fittings, measuring devices, or closure elements.

[0089] The "open port into the measuring chamber" describes the inner closure of the cross-access, which is in direct fluidic connection to the measuring chamber. This enables direct flow or measurement data acquisition without intervening flow obstructions. In this design, for example, a sensor can directly detect the flow state in the center of the measuring chamber or a return of fluids to the core area can be achieved.

[0090] A key advantage of this design is the symmetrical construction and the associated structural balance of the regulator. This simplifies assembly, reduces the risk of distortion during installation, and allows for even pressure distribution within the housing. Furthermore, a wide range of application possibilities arise: The coaxial cross ports can be used, for example, for flow sensors with differential pressure measurement, where one sensor can access both flow directions simultaneously. In certain variants, the coaxial ports can also fulfill different functions – for example, one for sensor technology, the other for flushing purposes – or alternatively, they can be equipped with shut-off ball valves, quick-release couplings, or automatic shut-off valves. It is also conceivable for one of the ports to serve as a redundant safety connection, providing an immediate alternative in the event of a failure of the first.

[0091] The precise design with two coaxial, standardized half-inch connections thus opens up a modular, reliable and at the same time easy-to-install design of the proportional flow controller, which can demonstrate its advantages in various system scenarios.

[0092] A10

[0093] An optional design is characterized in that one or both cross accesses have a safety valve and / or a flow switch and / or a temperature sensor and / or another sensor.

[0094] This version extends the technical functionality of the previously described cross accesses by allowing the integration of additional safety devices or sensor components. This transforms the proportional flow controller into not only a hydraulic control device, but also a modular platform for system monitoring, operational data acquisition, and protective measures. The ability to integrate various types of sensors or safety-relevant fittings directly into the controller body opens up a wide range of application possibilities in modern heating and domestic hot water systems with increased demands on system diagnostics and safety.

[0095] The following terminology is used to explain this:

[0096] The "safety valve" is a self-opening safety device that allows pressure to be released to the atmosphere or into a return system when a defined operating pressure is exceeded. It protects the system from excessive overpressure, for example, due to thermal expansion or blockages in the piping system. The safety valve can be spring-loaded or diaphragm-controlled and is preferably factory-calibrated to a specific set pressure. In this design, the safety valve is mounted directly on the cross-access port, so it reacts immediately to the pressure in the measuring chamber.

[0097] A flow switch is a sensor or switching device that detects the presence, direction, or velocity of a fluid flow. It can be designed as a mechanical impeller sensor, a reed switch with a flow piston, or an electronic flow sensor. The flow switch delivers an electrical signal as soon as a minimum flow is reached or exceeded, and can thus be used to control pumps, alarm devices, or control logic modules.

[0098] The "temperature sensor" is used to measure the temperature of the medium in the domestic water line and can be implemented as a thermocouple, resistance temperature detector (RTD), or thermistor. Its position in the cross-access port places it particularly close to the hydraulic center of the controller, enabling precise measurement without thermal distortion caused by the housing walls or environmental influences.

[0099] The term "another sensor" encompasses all other conceivable measuring or detection devices that can be mounted on a cross-access point, such as pressure sensors, conductivity sensors, flow sensors, pH probes, or multi-function combination sensors. The integration of digital communication modules for forwarding and further processing, either wired or wireless, is also conceivable here.

[0100] In a further variant of this design, the cross access can also be configured as a multifunctional measuring and control point, in which several of the aforementioned components are combined in a modular manner. For example, a compact module could be implemented that functions simultaneously as a flow switch, temperature sensor, and safety unit. Such a module could be attached to the cross access via a quick-release coupling without the need for tools, making the controller particularly maintenance-friendly and flexible for use in changing requirements. Furthermore, the integration of several sensor types enables continuous recording of relevant operating parameters in real time, supporting a data-based control strategy in the higher-level heating control system. This is particularly advantageous for smart building technology solutions where increased efficiency, error prevention, and remote monitoring are key aspects.

[0101] The use of standardized sensor connections facilitates compatibility with different system manufacturers and increases interchangeability during service. The proximity of the cross access to the measuring chamber of the proportional flow controller also enables very precise and fast sensor response times.

[0102] A further advantage lies in the ability to assign different cross accesses to specific functions. For example, a first access can be permanently equipped with a temperature sensor, while a second access can be used temporarily for measurement campaigns, test operations, or rinsing processes.

[0103] It is also conceivable to combine this version with digital interfaces such as M-Bus, Modbus, or KNX, allowing the measured values ​​from the proportional flow controller to be read directly into the central control technology of the building system. Equipped with appropriate sensor units, the controller thus becomes an intelligent element of the overall system, not just passively controlling but actively contributing to operational optimization.

[0104] This extended functionality combined with minimal structural effort makes the proportional flow controller particularly suitable for use in demanding systems with high system integration, extensive sensor architecture or strict safety requirements.

[0105] A11

[0106] According to an eleventh aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided,by means of which the lifting part realizes the operative connection and, when lifted, actuates the actuator in the direction of the stroke, wherein the push rod comprises an austenitic stainless steel, in particular stainless steel 1.4301, 1.4307, 1.4401, 1.4404, 1.4571, 1.4435, 1.4541 or 1.4016, preferably 1.4401, and in particular consists thereof, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line.

[0107] This version expands the controller's design with a continuous connecting rod, which bridges the mechanical connection between the sanitary and heating sides of the controller and simultaneously enables reliable power transmission between the lifting part and the actuator. The choice of material for the connecting rod plays a key role, as it must not only be mechanically highly resilient, but also corrosion-resistant and compatible with the media—especially with regard to the dual media environment of domestic hot water and heating water.

[0108] The following terminology is used to explain this:

[0109] The "push rod" is a rod-shaped mechanical connecting element used to transmit a linear movement between two functional units. In this design, the push rod connects the lifting part located on the sanitary side with the actuator on the heating side. It is axially guided and transmits the lifting movement precisely and without loss. "Austenitic stainless steel" refers to a specific alloy class of stainless steels characterized by its high chromium and nickel content and excellent corrosion resistance, mechanical strength, and good formability. Typical representatives of this group are the material numbers mentioned in the claim, such as 1.4301 (V2A), 1.4404 (V4A), 1.4571 (Ti-stabilized stainless steel), or 1.4435 (high-alloy V4A with improved acid resistance).These materials are proven in the sanitary and heating sectors because they remain resistant to drinking water, condensates, heat-conducting media and chemically aggressive additives.

[0110] The "sanitary side of the proportional flow controller" describes the controller section assigned to the domestic water line, i.e., the part of the system that comes into contact with hygienically sensitive drinking water. Accordingly, the materials used in this area must be selected to meet applicable drinking water hygiene requirements.

[0111] The "heating side" is the section of the regulator associated with the heating water line. Since these systems typically involve closed circuits with circulating heating water, different temperature and pressure conditions must be considered than on the plumbing side. The connecting rod bridges the interface between the two sides and must simultaneously meet hygiene requirements and withstand the thermal and mechanical stresses of the heating system.

[0112] A key advantage of this design lies in the continuous mechanical power transmission along the entire regulator axis, coupled with the reliable choice of material for both media chambers. The austenitic stainless steel design of the push rod offers excellent resistance to corrosion, stress cracking, material fatigue, and thermal expansion. Furthermore, the material is biocompatible and meets the requirements of DIN EN 10088 and relevant drinking water regulations.

[0113] In advanced versions, the push rod can be additionally provided with surface finishes, such as a passivation layer, a PTFE coating, or an electropolished surface, to minimize friction losses and improve cleanability. A multi-part push rod with an articulated coupling or a telescopic design are also conceivable, allowing for compact designs with a long stroke length.

[0114] The continuous design of the push rod across both sides of the controller thus represents a particularly robust, durable and media-compatible construction that is suitable for both conventional and state-of-the-art heating and domestic hot water systems.

[0115] A12

[0116] An optional version is characterized by the fact that the push rod on the sanitary side is coupled to the lifting part with a mechanical coupler and on the heating side has its own spring for resetting during lifting.

[0117] This design expands the existing push rod concept with a targeted mechanical decoupling and reset function, enabling optimized kinematics and increased operational reliability of the proportional flow controller. By coupling the push rod with a separate mechanical coupler on the plumbing side, the push rod can be flexibly connected to the lifting part, with the geometry and play being specifically adjustable. The return spring on the heating side, in turn, supplements or replaces the action of a central return spring on the plumbing side and contributes to the uniform return of the control components to their starting position, particularly in the case of asymmetric loads or dynamic pressure surges.

[0118] The following terminology is used to explain this:

[0119] The "mechanical coupler" is a coupling element that creates a detachable or positive connection between the push rod and the lifting part. It can be designed, for example, as a clamping piece, bayonet lock, plug-in connection, locking coupling, or spring-locking system. The coupling enables easy assembly, defined positioning, and, if necessary, mechanically limited relative movement between the components, for example, to compensate for manufacturing tolerances or thermal expansion.

[0120] The "sanitary side" is the section of the proportional flow controller where the lifting part is moved by the influence of the domestic water flow. Connecting the push rod to the lifting part via a mechanical coupler ensures that the lifting movement is fully transmitted to the push rod without creating excessive mechanical stress.

[0121] The "return spring on the heating side" is an elastic element that acts axially on the connecting rod and returns it to its original position after the end of its stroke. It can be designed as a helical compression spring, disc spring, or annular spring and is preferably located in a spring seat between the heating side of the housing and a stop on the connecting rod. This spring-loaded return is particularly advantageous when the return forces on the sanitary side are insufficient or when a controlled return flow must be ensured even under changing pressure conditions.

[0122] A key advantage of this design is the improved dynamics of the control process, as the spring force can be adjusted specifically. Furthermore, the dual return mechanism—sanitary spring and heating spring—achieves symmetrical load distribution and mechanical decoupling. This increases the service life of the components and reduces wear.

[0123] In preferred variants, the mechanical coupler can be made of a vibration-damping material or contain a damping insert to absorb shock forces. The return spring can be designed progressively, so that the return travel increases with increasing spring force, thus ensuring smooth return with end-position damping. It is also conceivable that the return spring can be preloaded or adjusted without tools, for example, via a threaded clamping system with a locking mechanism. This design contributes overall to more precise control characteristics, greater mechanical relief, and improved maintainability of the controller.

[0124] A13

[0125] According to a thirteenth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided,by means of which the lifting part realizes the operative connection and, during the stroke, actuates the actuator in the direction of the stroke, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and the heating side housing part forms the heating water line, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, wherein a seal of the push rod is provided, characterized in that the seal within the sanitary side housing part has a sealing chamber extending longitudinally along the push rod, in which the seal has two spaced-apart O-rings, namely a sanitary-side O-ring and a heating-side O-ring,which form a lubrication chamber between them containing a quantity of lubricant, wherein the lubricant can comprise, in particular, an oil, graphite, grease, powder, and / or paste. This design introduces an innovative sealing concept that secures the push rod in the axial direction via a longitudinally oriented sealing chamber. The special arrangement of the O-rings and the intermediate lubrication chamber contribute to minimizing friction losses in the movable push rod, maintaining the sealing function over the long term, and extending the service life of the sealing system. At the same time, the lubrication chamber prevents premature material fatigue of the O-rings and protects the sealing system from contamination or dry running.

[0126] The following terminology is used to explain this:

[0127] The "sealing chamber" is an axially extending cavity within the sanitary side housing section, specifically designed to accommodate and guide sealing elements. It is designed so that the push rod remains axially movable, but is simultaneously sealed radially against fluid leakage by sealing elements. The sealing chamber can be cylindrical, multi-stage, or stepped to accommodate different sealing elements one after the other.

[0128] The "two spaced-apart O-rings" are annular elastomer seals, each located on the circumference of the push rod and sealing against the inner wall of the sealing chamber. Their axial spacing creates a defined gap between the O-rings, which serves as a lubrication chamber. The O-rings can be made of FKM, EPDM, silicone, or other suitable elastomers approved for contact with both process water and lubricants.

[0129] The "sanitary side" and "heating side" positions of the O-rings refer to their position relative to the regulator architecture. The sanitary side O-ring is positioned closer to the domestic water inlet, while the heating side O-ring is positioned closer to the housing transition to the heating side. Both act in an axial direction against the respective fluid pressure.

[0130] The "lubrication chamber" is the space between the two O-rings, which contains a quantity of lubricant. This chamber acts as a permanent friction-minimizing unit and can also absorb light contaminants or particles before they reach the sealing lips. The "lubrication chamber" is the substance introduced into the lubrication chamber to reduce friction and wear. It can be in the form of liquid oil, pasty grease, solid-based graphite, or a powdered lubricant. The preferred design uses a water-insoluble, temperature-stable grease that remains in the chamber for the entire service life of the regulator.

[0131] A key advantage of this design is its long-lasting sealing effect while simultaneously minimizing sliding friction on the push rod. The double seal with lubricant decoupling ensures high operational reliability, even with frequent actuation cycles or thermal load changes. Furthermore, lubricants with anti-corrosive properties can be used, which also protect the metal surfaces of the push rod.

[0132] In some variants, the lubrication chamber may have a small refill opening or be combined with a reserve chamber that automatically replenishes lubricant in the event of a gradual loss of lubricant. It is also conceivable that a capillary fleece is integrated into the chamber, which distributes the lubricant evenly and also acts as a dust barrier.

[0133] This design therefore represents a technically sophisticated and practical solution for the permanent, movement-tolerant and low-maintenance sealing of the push rod in a proportional flow controller.

[0134] A14

[0135] An optional version is characterized by the fact that the sealing chamber has another sanitary side O-ring in addition to the sanitary side O-ring.

[0136] This design expands the sealing system by adding an additional O-ring on the sanitary side in addition to the existing O-ring on the sanitary side. This double seal on the inlet side of the sealing chamber significantly increases the sealing effect and creates a redundant seal against the domestic water area. Especially with increased demands on hygiene, safety, and sealing reliability, this variant offers a design optimization to protect against leaks, material fatigue, or seal failure during continuous operation.

[0137] The following terminology is used to explain this:

[0138] The "additional sanitary-side O-ring" is an additional sealing ring positioned in front of the original O-ring, which also seals radially against the connecting rod and axially against the inner wall of the sealing chamber. This second O-ring acts as the first barrier against the process water and protects the O-ring behind it as well as the lubrication chamber from direct water contact, contamination, or microbial colonization. The arrangement can be designed so that the two O-rings form their own small intermediate chamber, which, depending on the design, can remain empty or be filled with a hygroscopic protective substance.

[0139] A "sanitary-side O-ring" is – in the sense of this definition – a ring-shaped, elastic sealing element that is positioned axially closer to the domestic water inlet than the other sealing elements. The additional placement of a second such O-ring increases the security of the separation between the hygienically sensitive domestic water area and the internal sealing system.

[0140] A key advantage of this design is its increased sealing resilience: Should one O-ring lose its sealing function due to aging, material fatigue, or improper installation, the second O-ring takes over. Furthermore, the service life of the entire sealing unit is extended because the load is distributed across two sealing elements. This double seal can also better absorb and compensate for pressure peaks.

[0141] In preferred variants, the two sanitary-side O-rings are guided in separate, axially arranged annular grooves, ensuring a defined distance. Alternatively, a support disc or intermediate sealing ring can be provided between the two O-rings to distribute the sealing force specifically or to further stabilize the chamber between them. It is also conceivable for one of the two O-rings to be made of a particularly chemical-resistant or pressure-elastic material, while the other is designed for high restoring force or thermal stability. This allows combined sealing functions to be realized in a compact design.

[0142] This design contributes significantly to increasing the operational reliability of the proportional flow controller and allows its use even under particularly demanding operating conditions, such as high hygiene pressure, alternating thermal loads or in systems with particularly sensitive usage profiles such as drinking water systems in medical facilities or residential complexes with increased protection classification.

[0143] A15

[0144] An optional design is characterized by the fact that the sealing chamber is arranged in the sanitary-side housing part, but preferably the sanitary-side O-ring is mounted water-free.

[0145] This design represents a further refinement of the sealing concept, in which the sealing chamber is structurally located entirely within the sanitary-side housing section. This architectural integration creates a clear functional separation of the sealing chamber from adjacent component zones, particularly from the heating-side area. At the same time, a special measure is provided to store the sanitary-side O-ring in a water-free environment. This means that the O-ring is not permanently exposed to liquid media but is positioned in an isolated chamber zone, resulting in a significantly extended material service life, reduced diffusion stress, and greater seal resilience.

[0146] The following terminology is used to explain this:

[0147] The "sealing chamber" is the axial space in the housing specifically designed to accommodate the O-rings and, if applicable, the lubricant chamber. In this version, this chamber is designed to be fully integrated into the housing body of the sanitary component, simplifying manufacturing and allowing for a compact design. The axial arrangement of the chamber in the sanitary housing promotes maintenance-friendly accessibility and allows for the sophisticated integration of sealing elements and guide contours.

[0148] The "sanitary-side O-ring" is the one of the two axially arranged sealing rings positioned closest to the inlet area of ​​the service water. In the present design, this ring is specifically placed in a chamber zone that is not continuously flowed through by the medium during normal operation. This so-called "water-free mounting" means that the O-ring is located outside of the direct contact zone with the flowing medium—for example, through a small blind-hole chamber, a recessed groove, or a capillary-breaking housing geometry.

[0149] A key advantage of water-free storage is the significant reduction in material stress on the O-ring. The sealing material is thus less exposed to the thermal, chemical, and microbial stresses of the process water, which slows down the aging of the elastomer and maintains a consistent sealing effect over long periods of operation. At the same time, the risk of calcification, biofilm formation, or diffusion processes on the O-ring surface is reduced.

[0150] In preferred variants, water-free storage can be achieved through a double construction of the sealing chamber, in which the O-ring is located behind a small recess in the housing through an annular groove. Alternatively, the chamber zone can be provided with a minimal pressure equalization channel that vents standing water during assembly without permanently wetting the O-ring. An additional dust protection lip or a capillary-active material insert can also be provided to keep the chamber dry.

[0151] This design is particularly suitable for demanding operating conditions where a long-lasting sealing function and reduced maintenance requirements are required. This applies, for example, to systems with increased hygiene standards, high temperature cycles, or difficult-to-access installation locations where maintenance-free functionality is required.

[0152] A16

[0153] According to a sixteenth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided,by means of which the lifting part realizes the operative connection and, when lifted, actuates the actuator in the direction of the stroke, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, wherein a seal of the push rod is provided between the sanitary side and the heating side, characterized in that the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and the heating side housing part forms the heating water line, wherein the two housing parts are connected to one another, namely with a surrounding collar,The sleeve is designed as a sleeve enclosing the other housing part and preferably extends from the heating-side housing part and encloses the sanitary-side housing part along a surrounding section, with a stuffing box provided between the sleeve and the enclosed housing part within the surrounding section. This design represents a structurally particularly robust and simultaneously functionally optimized solution for connecting the two housing parts of the proportional flow controller. The design of a surrounding collar in the form of a sleeve that concentrically surrounds the other housing part creates a force-locking and centered connection unit. The stuffing box integrated within the surrounding section serves as a high-performance sealing device that ensures reliable sealing even under dynamic stress, thermal expansion, or slight relative movement between the housing parts.

[0154] The following terminology is used to explain this:

[0155] The "surrounding collar" is an axially extended housing section, shaped to completely or partially concentrically enclose the other housing section. In this case, the surrounding collar is designed as a "sleeve"—that is, a tubular, usually cylindrical component with an internal contact surface for the enclosed housing section. The sleeve preferably extends from the heating side housing section and forms a form-fitting mount for the sanitary side housing section.

[0156] The "surrounding section" is the axial section over which the sleeve encloses the enclosed housing part. This section serves not only for mechanical centering and force transmission but also as a seal against the escape of fluids or the ingress of air. Depending on the design, the surrounding section can be smooth, grooved, conical, or stepped.

[0157] The stuffing box is a sealing device located in the space between the sleeve and the enclosed housing section within the enclosure. It preferably consists of several layers of sealing fiber or graphite material that are compressed axially or radially, thereby creating a circumferential sealing effect. The stuffing box can also be designed as an elastomeric sealing collar or multi-part packing ring. It is particularly suitable for compensating for movement, absorbing thermal expansion, and ensuring permanently tight connections. A key advantage of this design lies in the combination of precise housing centering, highly effective sealing, and design flexibility. The sleeve allows for easy assembly, a stable connection between both housing parts, and secure guidance of the connecting rod. At the same time, the stuffing box ensures low-maintenance and long-lasting sealing, even under changing operating conditions.

[0158] In preferred variants, the stuffing box can be axially preloaded or compressed using an adjustable compression device. A multi-zone seal with differentiated material layers (e.g., graphite inside, PTFE outside) is also conceivable, as is a tool-free, removable connection of the housing components using a bayonet lock or quick-release ring instead of screw connections.

[0159] This design ensures a particularly reliable and easy-to-install design of the proportional flow controller and contributes significantly to the sealing and functional reliability of the entire system.

[0160] A17

[0161] An optional design is characterized in that the two housing parts are tightened against each other within the enclosure by means of a toggle, in particular by means of a self-centering toggle screw with a threaded hole in the sleeve.

[0162] This design complements the previously described sleeve geometry with a targeted mechanical securing of the connection between the heating side and the sanitary side of the proportional flow controller. A toggle is provided as a fastening mechanism, which keeps the enclosed housing part centered within the sleeve and simultaneously secures it with a defined clamping force. The use of a self-centering toggle screw ensures even force application along the circumferential direction and prevents tension or deformation in the area of ​​the enclosure. The toggle screw allows for simple, quick, and tool-free assembly and disassembly, which significantly improves ease of maintenance. The following terminology is used:

[0163] A toggle clamp is a mechanical fastening device in which an axial clamping force is generated by turning a lever, handle, or screw, clamping two components together. The toggle clamp can be operated manually and enables a detachable yet stable connection. It replaces or complements traditional screw connections and is particularly suitable for repeatedly detachable assembly units.

[0164] The "self-centering toggle screw" is a screw element with a handle or toggle that, through its geometry or additional guide structures, ensures automatic centering during assembly. This can be achieved, for example, through a conical screw tip, a spherical bearing surface, or a positive centering mount. The toggle screw is preferably equipped with a handle that allows tool-free operation.

[0165] The "threaded hole in the sleeve" is a screw receptacle with an internal thread integrated into the sleeve geometry, into which the toggle screw is screwed. Tightening the toggle screw exerts a clamping force on the enclosed sanitary side panel, securing it in the sleeve with a positive and force-fitting fit.

[0166] A key advantage of this design is its high installation efficiency: The regulator can be quickly and safely installed or removed as needed without compromising the sealing function of the stuffing box. The thumb screw also ensures even stress distribution, significantly reducing the risk of leaks or material deformation.

[0167] In preferred variants, the thumbscrew can be equipped with a locking mechanism, a locking spring, or a safety catch to prevent accidental loosening. It is also conceivable for several thumbscrews to be evenly distributed around the circumference of the sleeve to achieve a particularly homogeneous clamping force distribution. This design represents a particularly easy-to-install, service-friendly, and mechanically stable variant of the housing connection in the proportional flow regulator and is ideally suited for applications with varying service intervals, demanding installation conditions, or increased safety requirements.

[0168] A18

[0169] According to an eighteenth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator,wherein the proportional flow regulator comprises a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and the heating side housing part forms the heating water line, wherein the two housing parts are connected to one another, characterized in that one of the two housing parts has a threaded bore of size M3, M4 or M5, wherein the threaded bore is preferably aligned transversely to a longitudinal direction of the proportional flow regulator and / or one of the two housing parts has a threaded bore in the form of a fastening eye, preferably arranged on an inlet nozzle or outlet nozzle, especially on the domestic water line.

[0170] This version extends the proportional flow controller with a mechanical interface for mounting or attaching external components, particularly through the targeted integration of standardized threaded holes. This offers a wide range of practical applications – be it for permanently securing the controller in a system installation, for attaching additional components such as sensor holders, mounting plates, or covers, or for attaching tools for maintenance. The selection of standardized thread sizes ensures high compatibility with commercially available accessories.

[0171] The following terminology is used to explain this:

[0172] A threaded hole is a cylindrical hole with an internal thread that accommodates a screw, bolt, or set screw. Sizes M3, M4, or M5 correspond to metric ISO threads, which are widely used and readily available. They enable a mechanically resilient connection with standardized screw fasteners and are particularly common in plant engineering.

[0173] The threaded hole oriented "transverse to the longitudinal direction" describes a spatial orientation of the hole that is perpendicular to the main axis of the regulator. This arrangement facilitates the attachment of fastening elements to the front or side surfaces and ensures a particularly stable mounting of the regulator without compromising the flow components.

[0174] The "mounting eye" is a special geometric design of a threaded hole, in which it is integrated into a ring-shaped, reinforced portion of the housing, which visually and functionally resembles an eyelet or lug. The mounting eye allows for the secure attachment of not only screws but also hooks, tensioning straps, wire clamps, or other connecting elements. It is preferably positioned at points on the regulator subject to particularly mechanical stress, such as an inlet or outlet connection.

[0175] An advantage of this design is the increased installation reliability and flexible adaptability to different installation situations. The regulator can be precisely positioned, fixed, or aligned without the need for additional mounting aids. Temporary fixation during maintenance can also be quickly implemented. In preferred variants, the threaded hole can be equipped with a flat, recessed inlet zone to enable flush screwing with countersunk screws. A combination of several mounting points, for example in the form of a hole pattern, is also conceivable to implement various mounting configurations.

[0176] This design significantly simplifies installation, increases operational reliability through stable fastening options, and allows tool-free retrofitting of accessories or brackets - a contribution to the modular system architecture of modern heating and domestic hot water systems.

[0177] A19

[0178] According to a nineteenth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator,wherein the proportional flow regulator on the heating side has a front inlet in addition to the heating water inlet, wherein the domestic water inlet, the domestic water outlet, the heating water inlet, the heating water outlet and the front inlet each have an external threaded connector, characterized in that all five external threaded connectors have flat-sealing %-inch threads.

[0179] This design features a standardized and uniform connection geometry, significantly increasing the ease of installation and compatibility of the proportional flow controller with standard building technology components. The consistent use of flat-sealing male threaded connectors in the 1 / 4-inch format ensures a safe, reliable, and easy-to-implement connection to adjacent piping elements, valves, or installation units.

[0180] The following terminology is used to explain this:

[0181] The "external threaded connectors" are tubular connection sections with an external thread profile that allows for a screw connection with a corresponding internal thread. They form the transition point between the proportional flow controller and external piping elements. The threads are designed according to common standards, such as DIN EN ISO 228-1.

[0182] The "flat-sealing % inch thread" refers to a threaded connection in which the sealing effect is achieved not by conical thread flanks, but by a flat sealing washer or a flat seat gasket between the opposing end faces of the screw connection partners. This is widely used in drinking water and heating technology and allows for a controlled, media-independent sealed connection. The inch size % corresponds to a nominal diameter of approximately 26.44 mm and is standardized and widely available.

[0183] A key advantage of this design is its system compatibility: Since all connection points feature identical, standardized threads, a flexible selection of suitable piping systems, fittings, and connecting elements is possible. This not only simplifies initial installation but also subsequent maintenance work or modifications, as no special accessories are required.

[0184] In preferred variants, each of the externally threaded connectors can also be provided with a chamfer, a hexagonal shoulder, or a mechanical marking to facilitate installation and ensure a defined tightening torque. It is also conceivable for the front inlet to be offset or angled to enable installation even in confined spaces. This design contributes significantly to the standardization and simplification of system architecture, reduces the susceptibility to errors during installation, and supports cost-effective serial assembly in building construction.

[0185] A20

[0186] According to a twentieth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided,by means of which the lifting part realizes the operative connection and, during the stroke, actuates the actuator in the direction of the stroke, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, characterized in that the proportional flow controller on the heating side has, in addition to the heating water inlet, a front inlet, wherein the front inlet has an externally threaded nozzle, wherein the push rod in the neutral position protrudes axially from the nozzle by a maximum of the size of a nozzle diameter.

[0187] The following terminology is used to explain this:

[0188] The “forehead inlet 1is an additional entry point for heating water on the front of the heating side housing section, i.e., in the axial extension of the controller. It is primarily used to provide an alternative or supplementary heating water supply that functions independently of the side-mounted heating water inlet. This arrangement allows for greater flexibility when installing the controller in confined system geometries or with star-shaped piping.

[0189] The "external threaded socket" refers to a tubular connector with an external thread, designed for screw connection with a corresponding fitting—such as a pipe fitting or coupling. The flat-sealing design of this socket enables a secure, drip-free connection without conical thread sealing, which increases ease of maintenance and promotes the reusability of the connection.

[0190] The statement that "in the neutral position, the push rod protrudes axially from the nozzle by a maximum of one nozzle diameter" describes the design configuration of the regulator in the resting state. This defines that in its middle or unloaded position, the push rod does not protrude beyond a functionally disruptive distance, but remains at most within a range limited by the outer diameter of the front inlet. This serves to prevent mechanical collisions during system operation and to protect the push rod during assembly.

[0191] A key advantage of this design is the regulator's expanded connection geometry. The additional front inlet allows for more flexible heating water flow, which is particularly advantageous for varying installation positions or renovation projects. The front side is particularly suitable for vertical installation situations or through-bolt connections.

[0192] In preferred versions, the front inlet can be factory-fitted with a protective cap or a quick-release coupling to enable immediate system connection. Alternatively, a closure option with a blind cap is also available if the front inlet is not to be used. The front inlet can also be combined with a special centner bevel or a rotatable connection flange to further increase ease of installation. This design makes the proportional flow controller even more universally applicable, easier to install, and more adaptable in practical system installations.

[0193] A21

[0194] An optional design is characterized in that the front inlet has a nozzle cap and a tensioner, in particular a lever mechanism or a union nut, which interacts with the nozzle of the front inlet by means of a thread.

[0195] This version expands the design of the front inlet by providing a specific closure or fastening mechanism. The combination of a nozzle cap and a clamp creates a functional assembly that either secures, closes, or functionally expands the front inlet – depending on the specific design. The clamp represents the central fastening element, reliably pressing the cap against the nozzle, thus creating a secure seal, mechanical fixation, or even a functional connection.

[0196] The following terminology is used to explain this:

[0197] The "nozzle cap" is a hollow body or cover element that is slipped axially over the external threaded nozzle of the front inlet. It can serve simply as a seal or to enclose additional functional elements such as return springs, sensors, or adapter components. The nozzle cap can be form-fitting or additionally secured with threads, locking lugs, or sealing profiles.

[0198] The "tensioner" is a mechanical fastening element that connects the nozzle cap to the nozzle in a force-fitting manner. The preferred design is a union nut with an internal thread that presses the cap against a sealing surface or collar support when tightened. Alternatively, a lever mechanism can be provided, such as an eccentric or snap lock, which enables a tool-free connection and secures the cap through a pivoting movement.

[0199] The "thread with the nozzle of the front inlet" refers to the screw connection between the clamp and the nozzle, which is used to clamp the cap. This thread can be standardized or specially profiled and is designed to achieve a defined tightening torque to ensure the permanent sealing function.

[0200] A key advantage of this design is its structural modularity and ease of maintenance. The cap's detachable connection allows the front inlet to be opened, cleaned, or exposed for additional functional units as needed. The clamp allows for easy handling, especially in confined spaces, and minimizes the risk of leaks due to inadequate assembly.

[0201] In preferred versions, the clamp can be equipped with a locking step, a torque limiter, or a visual marker for visual or tactile monitoring of assembly quality. A tool-free quick-release version is also conceivable, in which the clamp is spring-loaded and can be locked in place with a quarter turn.

[0202] This design contributes significantly to the versatility of the proportional flow controller by enabling flexible adaptation to different installation situations as well as a reliable closure or connection at the front inlet - be it as a passive sealing closure or active interface module.

[0203] A22

[0204] An optional design is characterized by the nozzle cap having a collar and a union nut, particularly one with an external polygon, serving as a tightening element. This union nut engages around the collar of the nozzle cap and, with its internal thread, interacts with an external thread on the nozzle, so that the union nut seals the front inlet when tightened. This design represents a particularly mechanically stable and easy-to-assemble variant of the connection between the nozzle cap and the front inlet. By designing the nozzle cap with an integrated collar and clamping it using a form-fitting, circumferential union nut, a permanent, flat-sealing connection between the components is achieved. The design is suitable both for pure sealing and for the functional coupling of additional modules to the front inlet.

[0205] The following terminology is used to explain this:

[0206] The "collar of the nozzle cap" is a radially extending projection or shoulder on the outer circumferential surface of the nozzle cap. It serves as a positive contact surface for the union nut and transfers its axial clamping force directly to the cap. The collar can be designed as a cylindrical collar, conical shoulder, or stepped shoulder. In the preferred design, the collar is annular, ensuring even force distribution across the entire circumference of the cap.

[0207] The union nut is a rotating sleeve with an internal thread that slides over the collar of the nozzle cap and screws onto the external thread of the front inlet. When tightened, the cap is pressed forcefully against the front inlet, with axial clamping being provided by the collar. The union nut can be provided with an external polygon, such as a hexagon, a twelve-pointed star, or a knurled surface, to allow for easy handling with tools or manually.

[0208] The internal thread of the union nut is matched to the external thread of the front inlet, enabling a tight, tight screw connection. The sealing effect is not achieved via the thread flanks, but rather via the frontal contact of the nozzle cap with a sealing surface on the nozzle or via an additional sealing element, such as a flat gasket or an O-ring in a groove.

[0209] A key advantage of this design is its reliable sealing effect combined with a robust mechanical connection. The union nut is easy to install and remove, yet still allows a defined clamping force on the collar. Furthermore, the clear separation of the sealing and retaining functions offers design advantages – the collar ensures secure fixation, while the seal is specifically created using separate sealing elements.

[0210] In preferred variants, the union nut can be equipped with a locking mechanism, a safety tab, or a lock nut to prevent accidental loosening due to vibration or pressure changes. A tool-free quick-action union nut with a snap-in mechanism is also conceivable, especially for systems requiring frequent servicing.

[0211] This design therefore represents a particularly practical, leak-proof and durable connection unit in the area of ​​the front inlet, which simplifies installation and at the same time increases the operational reliability of the proportional flow controller.

[0212] A23

[0213] An optional design is characterized by the nozzle cap enclosing one end of the push rod.

[0214] This design complements the functionality of the nozzle cap in that it not only serves as a closure cap or sealing module, but also forms a protective and guiding enclosure for the front end of the push rod. This integrated arrangement creates a combined assembly that mechanically shields the push rod at its end, controls its freedom of movement, and simultaneously protects the adjacent system from any external influences or damage.

[0215] The following terminology is used to explain this:

[0216] The "front end of the push rod" is the axial end of the push rod on the side facing away from the sanitary side housing, typically in the area of ​​the front inlet. This is the outermost section of the rod, which, when not actuated, may protrude from the front inlet or rest there in its rest position. This end area is particularly exposed to mechanical stress, contamination, or corrosion and therefore deserves structural protection.

[0217] "Enclosure by the nozzle cap" means that the interior of the cap is designed to fully or partially accommodate the end of the push rod. The housing can be cylindrical, conical, or stepped and can also be equipped with a guide contour, a dust protection lip, or a damping element. The cap acts not only as a protective housing but also as a guide sleeve, which supports the central position of the push rod and compensates for unwanted lateral forces.

[0218] A key advantage of this design is the mechanical protection of the push rod against unintentional stresses, such as those caused by assembly tools, mechanical foreign objects, or vibrations during operation. Furthermore, the housing prevents dirt, dust, or water from penetrating the movable sealing points of the rod end, thus protecting the functional unit from wear and corrosion over the long term.

[0219] In preferred variants, the housing can be provided with axial clearance so that the push rod is guided within the cap during stroke movements without mechanical blockage. An integrated sliding bushing or a defined axial guide can also be provided to further stabilize the movement. Alternatively, the interior of the cap can be equipped with an elastic stop, which acts as a damper at maximum stroke and gently decelerates the front end of the push rod.

[0220] This design thus contributes to the operational reliability, longevity and mechanical integrity of the proportional flow controller and at the same time represents an elegant solution for the structural closure of the front inlet.

[0221] A24 An optional design is characterized by the fact that the nozzle cap encloses a spring that acts on the push rod during the stroke.

[0222] This design expands the functional role of the nozzle cap beyond a purely protective or connecting unit to an active component that provides the return force for the push rod. The nozzle cap serves not only as an outer housing, but also as a structural enclosure for a spring that acts on the push rod and returns it to its original position after the lifting process has been completed. Such return springs are of great importance for the functional reliability of proportional flow controllers, particularly for ensuring a defined neutral position when not actuated and for preventing uncontrolled readjustments or dead positions in the system.

[0223] The following terminology is used to explain this:

[0224] The "spring" is an elastic mechanical element that compresses or expands during the stroke of the push rod, thereby storing potential restoring energy. Once the load is removed, the spring releases this energy, ensuring the push rod automatically returns. The spring can be designed as a helical spring (compression spring), a leaf spring, or even a disc spring. A cylindrical compression spring with linear or progressive spring characteristics is preferred.

[0225] "Enclosure by the nozzle cap" means that the interior of the cap is dimensioned and designed in such a way that the spring is axially guided and protected against jamming. The cap can have a spring guide on the inside, such as a central guide lug, a guide channel, or a centering bushing. The cap also acts as an axial end stop for the spring, allowing a defined preload to be set.

[0226] The spring acts as a "return spring" on the push rod, compressing during the rod's stroke and then, thanks to its elasticity, pushing the push rod back toward its original position. It can act directly on the end of the push rod or via an interposed coupling element. In preferred versions, the spring rests between a stop surface in the cap and a shoulder of the push rod.

[0227] A key advantage of this design lies in the compact integration of the return mechanism and cap structure. This creates a functional unit with fewer components, simplified assembly, and improved ease of maintenance. By placing the spring inside the nozzle cap, it is also protected from external influences, extending its service life and maintaining a constant return force.

[0228] In other variants, the spring can be adjusted using a variable preload device, such as an adjustable end cap, a tension thread, or a compression bar. A combination with a damping unit—such as an elastomer buffer or a viscous damper sleeve—is also possible to make the return of the push rod particularly smooth and controlled.

[0229] This design increases the technical maturity of the proportional flow controller and enables an autonomous, purely mechanically feedback control process that operates independently of external energy sources - a particular advantage for energy-efficient and low-maintenance system architectures.

[0230] A25

[0231] According to a twenty-fifth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator,wherein the proportional flow regulator comprises a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and the heating side housing part forms the heating water line, wherein the two housing parts are connected to one another by a surrounding collar which is designed as a sleeve surrounding the other housing part and preferably extends from the heating-side housing part and surrounds the sanitary-side housing part along a surrounding section, characterized in that the sleeve has a coaxially rotatable bearing relative to the enclosed housing part, wherein a maximum angle of rotation is limited by a first stop and a second stop.

[0232] This design specifically enhances the connection between the heating and plumbing side housing sections in that the sleeve is not rigidly mounted, but rather rotatably mounted, thus allowing controlled relative rotational movement between the two housing units. However, the freedom of movement is specifically limited by a first and a second stop, between which the angle of rotation is variably adjustable. The rotational adjustment option can be used to influence fluidic parameters, connection positions, or adjustment mechanisms in a defined manner.

[0233] The following terminology is used to explain this:

[0234] A "coaxially rotatable bearing" refers to a mechanical arrangement in which the sleeve is mounted concentrically to the longitudinal axis of the proportional flow controller and can be rotated about this axis. The bearing can be realized by a sliding or rolling contact, e.g., using bearing bushes, sliding surfaces, or an integrated ball bearing, with the bearing forces being supported axially or radially.

[0235] The "first stop" and the "second stop" are structural limiting elements that define the extent of the sleeve's possible rotational movement relative to the enclosed housing part. They ensure that the sleeve can only move within a limited angle of rotation, thus preventing uncontrolled rotation or exceeding the functional limit positions. The stops can be designed as fixed lugs, pins, bolts, radially projecting projections, or housing cutouts that engage mechanically when the respective end stop is reached.

[0236] A key advantage of this design is the ability to finely adjust the regulator to a desired position during installation or operation without having to loosen the sealing or connecting units. The rotatable bearing allows, for example, connection nozzles to be aligned to defined positions, flow cross-sections to be adjusted, or internal control structures to be activated. At the same time, the limited angle of rotation protects against mechanical overload and ensures ease of use.

[0237] In preferred variants, the sleeve can be provided with a locking mechanism, such as a locking gate, a clamping spring, or a positive toothing, to enable reproducible positioning in discrete locking positions. It is also conceivable to integrate a scale or a visual indicator to visually check the sleeve's position.

[0238] This design makes the proportional flow controller not only more functionally versatile, but also easier to install, more reliable in operation and more flexible in plant engineering applications.

[0239] A26

[0240] An optional design is characterized by the fact that the sleeve has an elongated hole with a tangential extension, whereby the elongated hole defines the two stops.

[0241] This design concerns the concrete structural implementation of the previously described stop limit of the rotating sleeve. The elongated hole not only serves as a component for motion guidance, but also fulfills the function of a mechanical stop limit by physically defining the maximum possible rotational movement of the sleeve relative to the enclosed housing part. The tangential extension of the elongated hole precisely guides and limits the range of motion of the sleeve.

[0242] The following terminology is used to explain this:

[0243] The "slot" is an opening or recess in the sleeve wall that extends tangentially—that is, along a circular path around the longitudinal axis of the proportional flow regulator. It can be slit-shaped, curved, or designed as a longitudinal opening and forms a guide for a stop element located in the enclosed housing part. The slot thus defines the maximum adjustment angle of the sleeve.

[0244] The "tangential extension" describes the orientation of the slotted hole in a circumferential direction around the sleeve's rotational axis. This geometric alignment allows precise control of the rotation angle and enables uniform force transmission during the twisting movement. The shape of the slotted hole directly determines the range of motion allowed to the sleeve relative to the housing part.

[0245] A key advantage of this design is the simple, yet extremely robust, and permanently resilient limitation of relative torsional movement. The mechanically guided movement within the slotted hole ensures controlled, backlash-free movement, while reliably preventing any torsional movement beyond the desired range. The solution is easy to install, simple to manufacture, and allows for high manufacturing tolerances while maintaining a clear function.

[0246] In preferred variants, the slot can be provided with additional positive-locking recesses that create defined locking positions. It is also conceivable for the slot to not be completely open, but rather designed as a recessed guide track within a double-walled sleeve to prevent external contamination. This design allows for particularly reliable and permanently low-maintenance control of the rotational position between the sleeve and the housing part, thus contributing to the longevity and ease of use of the entire proportional flow controller.

[0247] A27

[0248] An optional embodiment is characterized in that the enclosed housing part has a stop element, in particular a radially projecting bolt.

[0249] This version specifies the design of the component that, in conjunction with the elongated hole in the rotating sleeve, forms the stop limit for relative rotation. While the elongated hole on the sleeve defines the geometric range of motion, the stop element located on the enclosed housing part ensures that this range cannot be mechanically exceeded. The stop element is therefore an essential component of the angle of rotation control.

[0250] The following terminology is used to explain this:

[0251] The "stop element" is a fixed mechanical component or component section positioned so that it abuts the ends of the slotted hole when the sleeve is rotated, thus acting as a physical rotation stop. It transmits the stop force at a specific point and ensures that the sleeve cannot be rotated beyond the intended range of motion. The stop element can be designed, for example, as a pin, nose, web, projection, or bolt.

[0252] The "radially protruding bolt" is a preferred embodiment of the stop element. It is aligned transversely to the longitudinal axis of the regulator and protrudes from the housing part towards the sleeve, so that it lies in the area of ​​the elongated hole and can strike against its limits. The bolt can be pressed in, welded on, or fastened in a bore and enables a very compact and precise stop function. Such a bolt is particularly advantageous due to its mechanical robustness, particularly in cases of frequent adjustment or under dynamic loads. A key advantage of this design is the clear separation between the moving part (sleeve with elongated hole) and the stationary part (housing with bolt). This achieves high wear resistance, easy maintenance, and a stable, repeatable limitation of the adjustment travel. Furthermore, the stop element can be easily replaced or adjusted if necessary without dismantling the entire assembly.

[0253] In preferred variants, the bolt can be spring-mounted or equipped with elastic damping to make the stop process quiet and gentle on the material. It is also conceivable for the bolt to engage in a special guide groove within the elongated hole to achieve a defined locking function or additional positional security.

[0254] This design offers a simple, highly functional option for limiting movement and contributes significantly to the safe handling and technical longevity of the proportional flow controller.

[0255] A28

[0256] An optional version is characterized in that the proportional flow controller has a rotation angle-controlled flow cross-section sensor, so that when the sleeve is rotated relative to the enclosed housing part, the kvs value of the domestic water line and / or the heating water line is adjusted, in particular with the largest or smallest kvs value at the two stops.

[0257] This version expands the functional design of the proportional flow controller in that the previously described twisting situation between the sleeve and the housing part not only serves as a mechanical orientation or a locking function, but is also actively used to influence the flow. By integrating a twist angle-controlled flow cross-section sensor, the flow resistance in the domestic hot water and / or heating water line is specifically changed – depending on the current twist angle of the sleeve relative to the enclosed housing part.

[0258] The following terminology is used: The "angle-controlled flow area sensor" is a component or arrangement within the proportional flow controller that adjusts the effective flow area depending on the angle of rotation. This can be achieved, for example, by a movable orifice, a rotatable throttle structure, an iris-like element, or a sliding superimposed flow profile. The change in the flow area directly influences the volume flow and thus the flow coefficient of the controller.

[0259] The "kvs value" (flow rate) is a parameter used in valve technology and describes the volume flow in cubic meters per hour that flows through the control element at a pressure drop of 1 bar. It serves as a measure of the flow capacity of a valve or regulator. Targeted manipulation of the kvs value allows for sensitive adjustment of the control behavior to specific system requirements.

[0260] The "adjustment of the kvs value by rotating the sleeve" means that the mechanical rotation of the sleeve—within the angle defined by the slotted hole and stop element—causes a continuous or stepped change in the flow cross-section. This allows the regulator to be preset to the respective hydraulic situation during installation or readjusted during operation.

[0261] A key advantage of this design lies in the combination of mechanical simplicity and fluidic flexibility. The mechanical adjustment allows different operating modes, pressure ratios, or control characteristics to be set without the need for external control or electronic regulation.

[0262] In preferred variants, the position of the sleeve can be marked with a scale to make the currently set kvs value readable. Mechanical locking of the position via a locking toothing or a locking screw is also conceivable. Alternatively, the flow cross-section sensor can be designed as a pre-assembled insert module that is calibrated to a desired kvs value during production. This design opens up a new level of customization and adaptability for the system manufacturer and operator, allowing the proportional flow controller to be used not only as a passive flow element, but also as an actively adjustable system component.

[0263] A29

[0264] According to a twenty-ninth aspect of the present invention, the stated object is achieved by a method for selecting the kvs value on a proportional flow controller in a heating domestic water system, in particular on a proportional flow controller according to one of the preceding claims, wherein the proportional flow controller has a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and the heating side housing part forms the heating water line, wherein the two housing parts are connected to one another, in particular with a surrounding collar,which is designed as a sleeve enclosing the other housing part and preferably extends from the heating-side housing part and encloses the sanitary-side housing part along a peripheral section, characterized in that a potential heating-side housing part is selected from a plurality of different potential heating-side housing parts with a view to a desired kvs value or a desired kvs bandwidth, and this is connected to the sanitary-side housing part.

[0265] This method describes an alternative, structurally elegant way to adjust the kvs value of a proportional flow controller. Instead of influencing a standard controller housing through mechanical adjustment, the desired flow characteristic is determined during assembly by selecting a suitable heating-side housing component. This approach allows for targeted modularization of the controller system and opens up a wide variety of types while simultaneously reducing manufacturing costs.

[0266] The following terminology is used to explain this:

[0267] The "kvs value" is - as already explained - the characteristic value that indicates the flow rate at a pressure loss of 1 bar. Adjusting the kvs value is crucial for optimally matching the controller to the hydraulic conditions of the respective heating and domestic hot water system. A kvs value that is too high leads to insufficient control effectiveness, while a kvs value that is too low leads to increased pressure loss.

[0268] In the context of this process, "selecting a heating-side housing component" means selecting a housing component specifically for the respective application that is internally designed—for example, via orifices, guide vanes, inlet geometries, or nozzles—so that the resulting kvs value corresponds to the required system value. The rest of the controller, especially the sanitary side housing component, remains unchanged. This modular approach makes it possible to create a wide range of different controller configurations with just a few basic components.

[0269] A key advantage of this approach lies in its series production: There's no need to configure or mechanically adjust individual flow modules for each system configuration – instead, precise hydraulic tuning is achieved by simply replacing the heating-side component. This also provides the operator with an easy retrofit option if operating requirements change.

[0270] In preferred variants, the housing components can be selected based on standardized markings, such as engraving, color coding, or serial numbers. It is also conceivable that a digital data sheet documents the corresponding kvs value to increase design reliability. This process thus represents a particularly economical, low-maintenance, and standardized solution for kvs value adjustment and is ideally suited for use in modular heating and domestic hot water systems.

[0271] A30

[0272] According to a thirtieth aspect of the present invention, the stated object is achieved by an M4 holder for an adjustment tool for the sleeve heater.

[0273] This version concerns a supplementary component that further optimizes the operation and handling of the proportional flow controller by creating a dedicated interface for the use of an adjustment tool. The M4 bracket represents a specifically designed mechanical mount intended to reliably and repeatably secure an external tool—particularly for adjusting or locking a heater within the sleeve or on the sleeve itself. This increases operating convenience and allows adjustments to be made even when the controller is installed.

[0274] The following terminology is used to explain this:

[0275] The "holder" is a mechanical receiving element or structural device that is permanently connected to the proportional flow controller and serves to position, guide, or secure a tool. It can be designed as a threaded hole, threaded bushing, slip-on sleeve, bayonet connection, or clamping system.

[0276] The "M4" design refers to the size of the threaded interface according to metric standards. An M4 thread has a nominal diameter of 4 mm and a standard pitch of 0.7 mm. This thread size is widely used, offers good mechanical stability, and is ideal for screw fastening small to medium-sized tools. The "adjustment tool" is an external mechanical tool—such as a screwdriver, an Allen key, a socket wrench, a special rotary handle, or an adapter—that is connected to or coupled into the M4 holder to perform a mechanical adjustment on a control-relevant component. The adjustment can, in particular, relate to a heating function, such as adjusting a heating element or a thermostatically controlled control component inside or on the sleeve.

[0277] A key advantage of this design is the standardized accessibility of the adjustment mechanism. The M4 mount enables precise, secure, and repeatable coupling of the tool, significantly improving the operability of the controller—even in confined installation spaces. Furthermore, the tool can be mounted temporarily or permanently, for example, as part of a control panel, a test adapter, or a service unit.

[0278] In preferred versions, the M4 holder can be equipped with a protective cap to protect it from dirt or corrosion. A holder with a locking mechanism or a self-centering mount is also conceivable to ensure precise alignment of the tool.

[0279] This design contributes to ergonomic handling, improved maintainability and the system integration of technical service functions into the overall structure of the proportional flow controller.

[0280] A31

[0281] According to a thirty-first aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims 1 to 28 or 30, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided,by means of which the lifting part realizes the operative connection and, during the stroke, actuates the actuator in the direction of the stroke, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and the heating side housing part forms the heating water line, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, wherein a seal of the push rod is provided, characterized in that the seal within the heating side housing part has a sealing chamber extending longitudinally along the push rod, in which the seal has two spaced-apart O-rings and a third O-ring, preferably a sanitary-side O-ring and two heating-side O-rings,wherein a lubrication chamber with a quantity of lubricant is preferably formed between the sanitary-side O-ring and the two heating-side O-rings, wherein the quantity of lubricant can in particular comprise an oil, a graphite, a grease, a powder and / or a paste.

[0282] This design enhances the sealing structure of the connecting rod with an optimized sealing arrangement that not only separates the pressure zones on the sanitary and heating sides, but also ensures targeted lubrication of the movable connecting rod. The stepped sealing arrangement with three O-rings and the lubrication chamber provided between them improves the sealing effect and reduces wear.

[0283] The following terminology should be explained: The "sealing chamber" is a longitudinal space in the heater side housing section, designed concentrically to the push rod and used to accommodate the sealing and lubricating components. It forms a self-contained functional unit in which the sealing elements are housed.

[0284] The O-rings are ring-shaped, elastic sealing elements located radially between the connecting rod and the inner wall of the sealing chamber, providing a fluid-tight seal. The sanitary-side O-ring is located closer to the domestic water line, while the two heating-side O-rings are located on the opposite side of the lubrication chamber. The double heating-side seal serves to increase the sealing reserve and improve lubricant retention.

[0285] The "lubrication chamber" is an axial space between the O-rings filled with a lubricant. This lubricant reduces friction on the push rod during stroke, protects against corrosion, and extends the service life of the sealing elements. The lubricant can be oil, graphite, grease, a dry powder, or a viscous paste, depending on the application requirements.

[0286] A key advantage of this design is the improved sealing effect combined with an optimized service life of the moving components. The combination of a redundant O-ring seal and targeted lubrication contributes significantly to low maintenance and operational reliability. Long-term functionality is guaranteed, especially with high switching frequencies or under thermal stress.

[0287] In preferred variants, the lubrication chamber can be equipped with a refill port or a grease nipple to facilitate maintenance. A viewing window for checking the lubricant level or a capillary absorber for dosing are also conceivable.

[0288] This design makes the proportional flow controller more robust, more durable and contributes to long-term functionality in demanding system environments.

[0289] A32 According to a thirty-second aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided,by means of which the lifting part realizes the operative connection and, upon stroke, actuates the actuator in the direction of the stroke, wherein the proportional flow regulator comprises a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and the heating side housing part forms the heating water line, wherein the push rod extends from a sanitary side of the proportional flow regulator to a heating side thereof, wherein a seal of the push rod is provided, characterized in that the seal has a stuffing box within the heating side housing part.

[0290] This version concerns an alternative or supplementary design for sealing the connecting rod in the heater side housing, whereby a so-called stuffing box is used instead of or in addition to O-ring systems. The stuffing box serves to dynamically seal moving shafts or rods against escaping media and is a proven solution in mechanical and valve engineering.

[0291] The following terminology is used to explain this:

[0292] The stuffing box is a mechanical sealing arrangement consisting of a cylindrical cavity (stuffing box chamber), a stuffing pack inserted therein, and a compression system. The stuffing pack consists of fibrous or plastic materials—for example, PTFE, graphite, aramid fibers, or metal-coated threads—which are pressed radially against the connecting rod by axial compression, thus achieving a reliable sealing effect.

[0293] The stuffing box chamber is integrated into the heater side casing and is designed concentrically with the connecting rod. The compression system can be implemented using a stuffing box flange, a clamping nut, a sealing washer, or a spring compression. The stuffing box is particularly suitable for applications where continuous movement must be combined with a high sealing effect.

[0294] A key advantage of this design is the adjustability and high temperature and pressure resistance of the stuffing box. While O-rings must be replaced when material fatigue occurs, the stuffing box can be restored to its optimal sealing range simply by readjusting. Furthermore, the stuffing box is particularly resistant to thermal fluctuations, mechanical shocks, and chemical media.

[0295] In preferred variants, the stuffing box can be combined with a refill port, a lubricant impregnation, or a leak detector. It is also conceivable to use a combination of O-rings and a stuffing box for redundancy.

[0296] This design increases the operational reliability and long-term tightness of the proportional flow controller under demanding operating conditions and represents a robust alternative to conventional sealing systems.

[0297] A33

[0298] According to a thirty-third aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims 1 to 28 or 30 to 32, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, characterized in thatthat the heating water line also has a cross access to the heating water supply.,

[0299] This design functionally expands the heating water line by providing an additional access point perpendicular to the main line direction. The transverse access allows for the integration of additional components into the line or the implementation of additional functions such as venting, pressure measurement, or bypass routing. In particular, this design improves connection flexibility during installation as well as the maintenance and monitoring options of the control system.

[0300] The following terminology is used to explain this:

[0301] The "cross-access" is an additional branch or connection piece on the heating water line that is not in the direction of flow but is positioned at an angle – preferably orthogonal – to the line's longitudinal axis. It enables fluid communication with other system components or measuring devices.

[0302] The “heating water supply 1 is the section of the heating water line through which heating water is supplied to the proportional flow controller. Cross access in this area allows for the early integration of additional technical functions before the medium reaches the actuator area.

[0303] A key advantage of this design is the significantly increased functional modularity of the controller. The cross access can be used in a variety of ways—for example, for venting, for accommodating a temperature sensor, a pressure sensor, a sampling valve, or for temporarily introducing cleaning or disinfectant agents. A commissioning or maintenance interface can also be provided here. In preferred variants, the cross access can be provided with a threaded connection—for example, an internal or external thread—and closed with a plug or sealing cap when not in use. A tool-free quick coupling or a bayonet connection is also conceivable.

[0304] This design makes the proportional flow controller a versatile, adaptable component that also allows subsequent extensions or adjustments without complete disassembly.

[0305] A34

[0306] An optional embodiment is characterized in that the transverse access has a transverse access nozzle, in particular having an internal thread, wherein the transverse access nozzle is preferably closed fluid-tight with a threaded plug when not in use.

[0307] This version specifies the structural design of the cross access as described in the previous section. In particular, it defines that the cross access is designed as a nozzle, which provides a mechanical and hydraulic interface for external connections. The internal thread design allows for the connection of a wide variety of standardized or customized components.

[0308] The following terminology is used to explain this:

[0309] The "cross-access port" is a tubular extension that branches off from the controller's heating water inlet and serves as a defined connection port. It can be integrated into the housing or separately welded, screwed, or pressed in. Its position allows easy access for technical service or expansion work.

[0310] The "internal thread" is a rotationally symmetrical profile on the inner wall of the cross-access nozzle, which allows for the screw-in connection of external components. This can be a metric, inch, or specially standardized thread. The thread geometry ensures a secure, tight, and mechanically resilient connection.

[0311] The "threaded plug" is a screwable closure element that is screwed into the internal thread of the nozzle when the cross-port is not actively in use. The plug forms a fluid-tight barrier, preventing any medium from escaping. It can be fitted with a seal, such as an O-ring or washer, to improve the sealing effect.

[0312] A key advantage of this design is the structural provision of a standardized connection option that can be activated immediately when needed. The use of internal threads allows for the use of standard connection technology without the need for special accessories.

[0313] In preferred variants, the threaded plug can be provided with a gripping contour, such as an external hexagon or slot, to enable tool-free installation. A plug locking mechanism with a spring catch or locking pin is also conceivable.

[0314] This design supports the high level of serviceability, flexibility and modularity of the proportional flow controller and makes it an optimally adaptable component for complex heating and domestic hot water systems.

[0315] A35

[0316] According to a thirty-fifth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims 1 to 28 or 30 to 34, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, characterized in thatthat the heating water line also has a cross access to the heating water drain.,

[0317] This version complements the technology described in Section A33, but now adds a cross-access port to the heating water inlet rather than the heating water outlet. This additional interface offers a wide range of functional options, particularly for monitoring, maintenance, or the additional connection of external systems, including in the return line of the heating water system.

[0318] The following terminology is used to explain this:

[0319] The "cross-access" refers to an additional branch or connection port located in the area of ​​the heating water outlet. Its function is similar to that of the cross-access in the inlet area, but here it is primarily used to control the recirculated heating water or to integrate return-side components such as sensors, valves, or flushing devices.

[0320] The "heating water drain" is the section of the heating water line through which the heating water is led out of the controller after heat transfer. A cross-access port in this section allows for direct monitoring or manipulation of the returning heating water.

[0321] A key advantage of this design is the expanded access to both sides of the heating water flow—both the inlet and outlet—enabling comprehensive control, monitoring, and maintenance of the entire heating circuit. This supports a higher degree of transparency and system integration, especially with sophisticated hydraulic control concepts.

[0322] In preferred variants, the cross-access port can be designed as a nozzle with an internal thread and closed with a plug when not in use. The integration of a safety valve, a temperature sensor, or a flow switch is also technically feasible and can be implemented without great effort.

[0323] This design increases the technical flexibility and functional depth of the proportional flow controller and opens up new application possibilities, particularly in the context of service, monitoring and system diagnostics.

[0324] A36

[0325] An optional embodiment is characterized in that the transverse access has a transverse access nozzle, in particular having an internal thread, wherein the transverse access nozzle is preferably closed fluid-tight with a threaded plug when not in use.

[0326] This design is the complementary counterpart to the cross-access design in the heating water inlet area described in Section A34, with the specific design of the cross-access in the heating water outlet now being described. The technical implementation is similarly achieved by a nozzle with an internal thread, which offers a modular connection option and can be securely closed when not in use.

[0327] The following terminology is used to explain this:

[0328] The "cross-access port" is a defined connection extension on the heating water outlet of the proportional flow controller, providing a mechanically stable and hydraulically sealed interface for additional components or measuring devices. It can be integrated directly into the housing or screwed on and is designed for quick connection of external components.

[0329] The "internal thread" allows for tool-free or tool-assisted installation of standardized fittings, sensors, or valves. It can be designed as a metric or inch thread and enables reliable connection while maintaining a high sealing effect. The "threaded plug" is the preferred closure mechanism when the cross-access port is not actively used. It prevents heating water from escaping, protects against dirt ingress, and ensures unrestricted control function. The plug can be made of metal or plastic and can be provided with a seal.

[0330] A key advantage of this design is the structural preparation of the regulator for future requirements or service interventions. The operator or installer has the option of quickly reverting to the existing internal thread if necessary, without having to make any structural changes to the regulator.

[0331] In preferred variants, the cross-access nozzle can be provided with a sealing lip or a conical sealing surface to achieve additional sealing when screwing in components. A protective cap or color-coding for easier localization during system operation is also conceivable.

[0332] This design supports a modern, maintenance-friendly and adaptable controller architecture that offers a high degree of technical flexibility through simple means.

[0333] A37

[0334] An optional embodiment is characterized in that the proportional flow controller according to claims 33 to 34 and 35 to 36 has exactly two transverse inlets in the heating water line and that the two transverse inlets are arranged, preferably axially parallel, on the same side of the proportional flow controller.

[0335] This version expands the design of the cross accesses by specifying a specific geometric positioning and number of these accesses. The arrangement of exactly two cross accesses in the heating water line enables symmetrical and functionally coordinated expandability of the controller system, with the axis-parallel positioning on a common side of the controller offering particular advantages in terms of installation space, maintenance, and operation. The following terminology is used:

[0336] As previously described, "cross ports" refer to additional connection points in the heating water line, particularly in the inlet and / or outlet areas. The specification of "exactly two" cross ports means that the controller provides exactly two such interfaces at the factory or by design, which can support a targeted separation of functions or a defined connection logic.

[0337] The "axis-parallel" arrangement means that the two cross ports are geometrically aligned parallel to the regulator's longitudinal axis, which promotes a clean, space-saving, and easy-to-install design. This alignment facilitates integration into standardized piping geometries.

[0338] The "same side" arrangement of the controller refers to the housing orientation in one installation position. Both cross access ports are located on the same housing surface or side, which is particularly advantageous for wall mounting or in confined system configurations, as all connections remain centrally accessible.

[0339] A key advantage of this design lies in the structured modularity of the controller: For example, a sensor and a shut-off element, or a vent valve and a bypass connection, can be mounted side by side without increasing the complexity of the installation. Furthermore, installation is significantly simplified by one-sided access.

[0340] In preferred variants, the two cross ports can each be provided with a threaded connection and coded or dimensioned differently to avoid functional confusion. A factory configuration in which one of the two ports is already pre-assembled with a standard component (e.g., a vent valve) is also conceivable.

[0341] This design supports a technically sophisticated, user-friendly and standard-compliant connection architecture and makes the proportional flow controller a particularly flexible component in the context of modern heating and domestic hot water systems.

[0342] A38

[0343] According to a thirty-eighth aspect of the present invention, the stated object is achieved by a proportional flow controller, in particular according to one of the preceding claims 1 to 28 or 30 to 36, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, characterized in thatthat the heating water line additionally has one or two front-side transverse accesses on a front side, namely a first front-side transverse access into the heating water inlet and / or a second front-side transverse access into the heating water outlet, and additionally has one or two rear-side transverse accesses on a rear side, namely a first rear-side transverse access into the heating water inlet and / or a second rear-side transverse access into the heating water outlet.

[0344] This version features an expanded connection architecture for the heating water line, providing not only one-sided but also two-sided cross-accessibility. This significantly increases the controller's connection flexibility and achieves maximum adaptability to various installation positions and hydraulic system requirements.

[0345] The following terminology should be explained: The "front" and "back" refer to two opposite sides of the proportional flow controller's housing, which, when installed, can be oriented toward the control panel or wall, for example. The arrangement of additional cross access ports on both sides allows for targeted separation of functions, for example, for flow-side optimization or for the integration of parallel functional units.

[0346] The "front cross accesses" are connection ports on the front of the heating water line that provide additional access to the heating water inlet and / or outlet. The same applies to the "rear cross accesses."

[0347] A key advantage of this design is the complete freedom of connection in terms of installation direction. The operator can choose whether measurement, maintenance, or control components are located on the front or rear of the controller. Furthermore, parallel lines or return loops can be implemented by combining both sides.

[0348] In preferred variants, all cross access points can have identical, standardized connection geometries or, alternatively, can be coded differently in pairs to clearly identify functional assignments. Equipping them with pre-assembled blind plugs or quick-release couplings is also technically feasible.

[0349] This design makes the proportional flow controller a highly flexible, individually configurable unit for demanding heating and domestic hot water applications and at the same time allows modular expansion even after initial commissioning.

[0350] A39

[0351] An optional design is characterized by the fact that the cross accesses of the heating water line have exactly two different sizes, specifically a quarter inch and a half inch. This configuration specifies the geometric design of the cross accesses on the heating water line by differentiating them according to connection sizes. This enables a targeted functional separation of the cross accesses, which is particularly advantageous with regard to the integration of different components such as sensors, valves, or service connections.

[0352] The following terminology is used to explain this:

[0353] "Cross ports" are additional connection points in the heating water line that provide a fluid connection between the heating water flow and external elements. The size of a cross port refers to the diameter of the corresponding connection, which can be either an external or internal thread.

[0354] A "quarter-inch" connection (W) refers to a connection with a nominal size that typically corresponds to a thread diameter of approximately 13.2 mm. It is particularly suitable for small sensors, vent valves, or measuring probes. A "half-inch" connection (72") corresponds to a nominal size of approximately 21 mm and is suitable for larger flow components such as bypass valves, safety valves, or flow meters.

[0355] A key advantage of this design is the clear functional assignment of the connection sizes. Based on the physical dimensions, the operator can directly identify which connection point is intended for which component, minimizing the likelihood of incorrect assembly and optimizing the installation logic. At the same time, the different dimensions allow for differentiated hydraulic control or measurement data acquisition.

[0356] In preferred variants, each connection size can be provided with a specific marking, color coding, or engraving to facilitate differentiation even after installation. It is also conceivable for the connection sizes to be factory-equipped with corresponding function modules, enabling immediate operation without additional components. This design significantly increases the clarity, safety, and integration capabilities of the proportional flow controller and is particularly useful for complex systems with sophisticated sensor technology or modular expansion components.

[0357] A40

[0358] An optional embodiment is characterized in that the front side has a first size, preferably exclusively the first size, and the back side has a second size, preferably exclusively the second size, in particular the front side is a quarter inch and the back side is a half inch.

[0359] This design involves a targeted spatial allocation of the different connection sizes of the cross accesses, as described in the previous section. The fixed distribution of the connection sizes on different sides of the heating water line creates a clearly structured connection architecture that further simplifies operation and connection logic.

[0360] The following terminology is used to explain this:

[0361] The "front" and "rear" refer to two opposite sides of the proportional flow controller's housing. When installed, these sides may, for example, face the operator side or the wall side, respectively. The arrangement of the connection sizes on these opposite sides allows for clear functional separation and facilitates access to specific components.

[0362] The "first size" and the "second size" refer to two different connection dimensions for the cross access ports, specifically quarter inch (W) and half inch (72"). Assigning the first size exclusively to the front and the second size exclusively to the rear means that all front cross access ports are equipped with the smaller dimension and all rear cross access ports with the larger dimension. A key advantage of this design is the high level of clarity and the automatic function assignment based on position. For example, it can be specified that all sensor connections are always made at the front, while only high-volume components such as safety valves or bypass modules are connected at the rear. This reduces sources of error, facilitates service operations, and improves modularity.

[0363] In preferred variants, the connection areas can be further differentiated by color markings, coded connection adapters, or mechanical fittings. Factory pre-installation of standardized components for each connection side is also conceivable.

[0364] This design contributes significantly to standardization, user-friendliness and system integration and represents an important detail for the optimization of complex plant structures.

[0365] A41

[0366] An optional design is characterized by the fact that the cross inlets of the heating water line are all axially parallel to one another.

[0367] This design concerns the geometric alignment of the cross connections relative to each other and specifies that all cross connections provided in the heating water line run parallel to each other. This supports a particularly clean, technically sophisticated, and easy-to-install design of the proportional flow controller, with all cross connections aligned in a common direction.

[0368] The following terminology is used to explain this:

[0369] "Cross accesses" also refer to the side or front connection points in the heating water line through which external components can be connected or measurement, maintenance, or control components can be integrated. The number of cross accesses can vary depending on the system, but in this design, it includes at least two or more connections.

[0370] "Axis-parallel" means that the longitudinal axes of the cross access ports—that is, the direction in which they protrude from the controller housing—run parallel to each other. This can refer, for example, to a horizontal or vertical alignment. It is crucial that there is no offset, slanted, or irregular arrangement; instead, all cross access ports are positioned in the same direction.

[0371] A key advantage of this design is its high level of technical clarity and efficiency during installation. All connections can be routed along a common mounting rail or cable level, which not only optimizes space but also significantly improves accessibility for tools and maintenance personnel. The risk of confusion during installation is also minimized.

[0372] In preferred variants, the axially parallel arrangement can be combined with a grid or mounting device that supports a defined alignment of the connected components—such as sensors, valves, or fittings. This also significantly simplifies integration into housing designs with standardized hole patterns or rail guides.

[0373] This design represents an important element for system harmonization and standardized interface design in the area of ​​modern heating and domestic hot water systems.

[0374] A42

[0375] An optional version is characterized by the fact that the cross inlets of the heating water line all have an internal thread.

[0376] This version describes a specific technical design for the cross connections on the heating water line in the form of a standardized thread design. By choosing an internal thread as the connection geometry, a high degree of compatibility with commercially available fittings, sensors, and other system components is achieved. This significantly simplifies installation and contributes to the universal usability of the proportional flow controller in various system environments.

[0377] The following terminology is used to explain this:

[0378] The “cross accesses” are the connection ports in the heating water line already described several times, which are used to hydraulically and mechanically connect external components such as sensors, valves, shut-off devices or service connections.

[0379] The "internal thread" is a rotationally symmetrical profile on the inner wall of a cross-connection, allowing the screw-in connection of external components. The thread can be designed according to ISO metric, BSP, NPT, or other standards. The thread size depends on the functionality and flow requirements of the respective connection.

[0380] A key advantage of this design is its high connection flexibility and standard compatibility. The use of internal threads enables a simple, tight, and mechanically stable connection with commercially available components. Furthermore, the thread allows for the use of simple closure elements such as plugs or blind screws when not in use.

[0381] In preferred variants, the internal thread can be supplemented with a sealing chamfer, an O-ring seat, or a conical sealing surface to achieve increased sealing effectiveness. A combination with a flat gasket or sealing paste is also conceivable.

[0382] This design contributes significantly to the modularity, ease of maintenance and universal connectivity of the proportional flow controller and represents an industrial standard for professional use in the heating and domestic water sector.

[0383] A43 According to a forty-third aspect of the present invention, the stated object is achieved by a home station for use in a heating and domestic water system, as a transfer unit for heating heat and for decentralized domestic water heating using the heating heat, wherein the home station has a series of connections for connection to central building lines and to apartment lines, namely on the building side at least to a domestic water supply line, a heating water supply line and a heating water return line and on the apartment side at least to a cold and hot water line to taps in the apartment and to a heating flow of the apartment and to a heating return of the apartment, wherein the home station has a heat exchanger, in particular a counterflow heat exchanger, characterized in that the home station has a proportional flow controller according to one of claims 1 to 28 or 30 to 42.

[0384] This version describes the systematic integration of the previously described proportional flow controller into a higher-level, fully functional unit—namely, a home station. The use of the controller within such a station enables particularly precise yet decentralized control of the domestic water flow and heating energy within a single residential unit, independent of central control mechanisms.

[0385] The following terminology is used to explain this:

[0386] The "apartment station" is a compact technical unit that is connected to a building's central supply infrastructure and acts as a transfer point for heating and domestic water within an apartment. It takes on the task of receiving the heating water from the central circuit and making it available for both space heating and decentralized domestic water heating.

[0387] The "transfer point" refers to the hydraulic and thermal interface area where the centrally generated energy – in the form of heating water – is transferred and further processed. The installation of a proportional flow controller at this point ensures that both the flow rates and the temperature conditions within the apartment are optimally regulated. The "heat exchanger" is a technical component within the apartment station that transfers the transferred heating heat to the cold water circulating in the domestic hot water area. A counterflow heat exchanger is particularly effective here, as it directs cold domestic hot water against the flow direction of the heating water, thus achieving a particularly high heat transfer performance.

[0388] A key advantage of this design lies in the combination of two systems: the decentralized control capability of the proportional flow controller with the integrated supply interface of the home station. This enables particularly sensitive, user-friendly, and energy-efficient control of water flows within the residential unit.

[0389] In preferred variants, the home station can also include an electronic control unit, a consumption meter, a circulation pump, or a storage bypass module. The proportional flow controller forms the central control element for hydraulic adjustment.

[0390] This version represents a particularly practical application example for the previously described controller and demonstrates its integrative usability in the context of modern residential building technology.

[0391] A44

[0392] According to a forty-fourth aspect of the present invention, the stated object is achieved by a heating and domestic water system for a building with a plurality of apartments, with central heating water generation and a distribution of heating water and cold domestic water to a plurality of apartment stations for transferring the heating water to the plurality of apartments and for decentralized domestic water heating there using the heating water, characterized in that the heating and domestic water system has a plurality of apartment stations according to claim 43. This embodiment describes the use of the technical concept disclosed in claim 43 in a higher-level overall building technology system. The aim is to realize decentralized, efficient, and demand-adaptive heat distribution by systematically equipping a building with a plurality of such apartment stations—each with an integrated proportional flow controller.

[0393] The following terminology is used to explain this:

[0394] The "heating and domestic water system" is the overarching supply system of a building, serving both the heating of individual apartments and the supply of hot water. It consists of a central energy source (e.g., heat generator, district heating transfer station), a piping network for heating water, and a parallel distribution system for cold domestic water.

[0395] "Central heating water generation" refers to the technical device that brings the heating water to a defined temperature and feeds it into the heating network. This can be, for example, a boiler, a heat pump, or a district heating connection.

[0396] The "distribution of heating water and cold domestic water" includes all building-side piping systems that carry the media to the respective apartment stations. Domestic water heating is not centralized, but decentralized within the apartment stations.

[0397] A key advantage of this design is the combination of centralized generation with decentralized distribution and heating. The control technology remains on the apartment side, allowing for a high degree of customization of hot water supply and demand-based control of energy consumption. The proportional flow controller in the apartment stations also enables sensitive, automatic adjustment of the flow rates to the respective consumption situation.

[0398] In preferred versions, the heating and domestic hot water system can be equipped with central consumption recording, central monitoring, or a higher-level building management system. The integration of standardized apartment stations with controllers allows for high scalability and facilitates maintenance, diagnostics, and system optimization.

[0399] This design demonstrates the system compatibility and energy-efficient use of the inventive control technology in the context of modern building technology.

[0400] A45

[0401] According to a forty-fifth aspect of the present invention, the stated object is achieved by a building with a plurality of apartments and with a central heating water production and a distribution of heating water and cold domestic water to a plurality of apartment stations for transferring the heating water to the plurality of apartments and for decentralized domestic water heating there by means of the heating water, characterized in that the building has a heating domestic water system according to claim 44.

[0402] This version elevates the integration of the entire supply system to the level of the structural infrastructure. It describes a building whose technical design is based on the system and component principle outlined in the preceding claims. This completes the system loop – from the central energy source through the more distributed technical transfer unit to the individual control system in the apartment.

[0403] The following terminology is used to explain this:

[0404] The "building" in this context is a residential building—for example, an apartment building, a block of flats, or an apartment complex—that has a central heating supply structure. This includes all the necessary technical equipment to supply heating energy and domestic water centrally, but also to distribute it decentrally to individual residential units. The "multiple apartments" refers to the building being designed as a multi-unit property, in which each individual residential unit is supplied independently via its own apartment station. This enables independent use and regulation of energy consumption.

[0405] "Central heating water generation" refers to the building's heat source. This can be based on a wide variety of technologies – from gas condensing boilers and heat pumps to district heating connections and solar storage systems.

[0406] The "distribution of heating water and cold domestic water" encompasses the entire piping system that carries the media from the central source to the individual residential units. This term implies that a simultaneous supply of cold domestic water and heated heating water is planned, allowing for separate control within the apartment.

[0407] A key advantage of this design lies in the structural preparation of the entire system for the energy-efficient, low-maintenance, and customizable supply of the individual residential units. The building itself thus becomes the infrastructural support unit of an advanced, decentralized supply technology, the core of which is the combination of an apartment station and an integrated proportional flow controller.

[0408] In preferred variants, the building structures and utility shafts can also be modularly prepared for later expansion or adaptation. Furthermore, the building management system can be designed so that each residential unit can be individually monitored and controlled.

[0409] This design represents the architectural-systemic consequence of the heating and domestic hot water system according to the invention and describes the structural-technical realization of the previously developed component logic on the scale of the entire building.

[0410] It should also be clarified that the term "apartment" in the context of this patent application is not intended to refer exclusively to traditional residential units in the sense of private households. Rather, the term also encompasses functionally equivalent units such as office units, practice rooms, commercial spaces, studio apartments, or other self-contained units within a building, provided they are independently supplied with heating and domestic water via a residential station within the meaning of the present invention. The decisive factor here is not the type of use in the narrower sense, but the structural and technical delimitation of the unit within the overall supply structure.

[0411] Furthermore, for the purposes of the present patent application, it should be explained that indefinite articles such as "one," "two," or corresponding quantitative specifications are generally not to be interpreted as restrictive, but as generally open. They should therefore generally be understood as "at least one," "at least two," etc., unless expressly stated otherwise. A limitation to "exactly one," "exactly two," or a specific number is only intended if this is expressly stated in the respective individual case or is clearly evident to the person skilled in the art from the technical context and the overall understanding of the description, or can only be technically intended in this way.

[0412] Further exemplary embodiments

[0413] The following describes exemplary embodiments of the present invention without limiting the scope of protection. Rather, the following statements serve to illustrate technical variants that implement the features of the invention in a particularly advantageous manner.

[0414] In one embodiment, the proportional flow controller is completely modular, allowing individual components—in particular the measuring element, the actuator, the return spring, the sealing chamber, and the housing—to be manufactured, maintained, or replaced independently of one another. This allows for easy adaptation to different operating requirements and a cost-effective maintenance strategy. The sealing membrane is preferably designed as a multi-layer membrane, combining an inner carrier layer with a high-temperature or chemical-resistant outer layer. This can significantly extend the service life of the sealing system. Alternatively, a corrugated membrane with defined elastic characteristics can be used to optimize the return behavior.

[0415] In a further embodiment, the lifting part is made of a high-strength, corrosion-resistant material, such as hardened austenitic stainless steel or a metal-plastic composite structure. Such materials ensure precise response while simultaneously offering high load-bearing capacity.

[0416] Preferably, the return of the lifting part is effected not only by a spring but also by a magnetic return force. For this purpose, a permanent magnet can be provided in the area of ​​the lifting guide, which, together with a metallic counterpart in the lifting part, provides additional return. This can improve sensitivity at low flows.

[0417] Another feature concerns the design of the cross access. This is particularly advantageously equipped with a multifunctional connection module that can be configured as a sensor receptacle, valve interface, or flushing unit as required. A tool-free quick coupling can significantly simplify the connection process.

[0418] A design is also conceivable in which the push rod is not only guided linearly, but also runs in a guided guide sleeve equipped with a friction-reducing element (e.g., PTFE lining or ceramic sliding coating). This reduces mechanical stress and increases long-term stability.

[0419] In a preferred embodiment, the sealing chamber is provided with a leak indicator, for example in the form of a pressure sensor, a drip channel, or a color display panel, which triggers a visual indication when lubricant leaks out. This allows for early detection of impending seal wear. Preferably, the actuator can also be designed as a self-regulating valve unit, for example in the form of a thermostatic, electromechanical, or pneumatic valve, which is automatically adjusted by the signal transmitted from the lifting part. This allows precise control of the heating water flows in real time.

[0420] In particularly preferred variants, the entire controller can be integrated into a compact module that can be retrofitted into existing systems as a plug-and-play unit. This modular design allows for flexible scaling and easy integration into existing systems.

[0421] These and other embodiments illustrate that the teaching of the invention can be implemented in a variety of technical ways without departing from the underlying inventive concept.

[0422] Short character description

[0423] To further illustrate the present invention, preferred embodiments are explained in more detail below with reference to the figures in the drawing. They show:

[0424] Fig. 1 - a longitudinal section of a proportional flow regulator according to the invention, showing a connection piece open for use in three-way operation. The sectional view provides insight into the internal functioning of the regulator, particularly with regard to the position of the flow paths, the arrangement of the stroke sensor surface, the stroke part, the return spring, and the sealing diaphragm structure.

[0425] Fig. 2 - the proportional flow controller shown in Fig. 1 in a similarly oriented view of its front side. The external structural elements are visible here, in particular the positioning of the domestic water inlet and outlet, as well as the visible front connection in the open position. Fig. 3 - the proportional flow controller according to Figs. 1 and 2 in a similarly oriented front view, but with the cap in place on the heating-side front side. This embodiment shows the controller in a two-way operation variant, in which the front connection is closed and not actively used for fluid flow.

[0426] Fig. 4 - The proportional flow regulator according to Figs. 1 to 3 in a perspective oblique view. This illustration allows a vivid visualization of the external geometry of the regulator with the cap in place according to Fig. 3, particularly highlighting the course of the transverse access ports, the housing edges, the sealing area features, and the handle contours.

[0427] Fig. 5 - the proportional flow regulator according to Figs. 1 and 2 or Figs. 3 and 4 in a side view from the left. In this illustration, the displacement cap on the service water side comes to the fore, which structurally covers the area around the stroke of the lifting part and usually accommodates the return spring. Here, the position, shape, and possible clamping elements of the cap are visualized.

[0428] Fig. 6 - a rear view of the proportional flow regulator shown in Figs. 3 to 5. This illustration shows the rear housing, including any rear cross accesses, mounting holes, or fastening devices.

[0429] Fig. 7 - a detailed longitudinal section of the proportional flow controller according to Figs. 3 to 6. This figure shows in detail the structural design of internal components, in particular the sealing chambers, the push rod guide, the return spring mechanism, and the actuator coupling.

[0430] Fig. 8a - the proportional flow controller according to Figs. 3 to 7 in a front view with a schematic connection diagram for two-way operation. This illustration shows the typical wiring of the inlet and outlet lines, as designed for closed operation without a front connection. Fig. 8b - the proportional flow controller according to Figs. 1 and 2 (or also according to Figs. 3 to 7 with the cap removed) in a front view with a schematic connection diagram for three-way operation. This example shows the additional front connection, which is actively integrated in this operating mode.

[0431] Fig. 9 - an exemplary apartment station, designed with a proportional flow controller as presented here.

[0432] The figures illustrate, by way of example, the structure and design of the proportional flow controller according to the invention in different operating modes and from various perspectives. The embodiments shown are not to be understood as exhaustive, but rather represent typical technical variants within the scope of the protection scope.

[0433] Character description

[0434] Fig. 1 shows a longitudinal section through a preferred embodiment of the proportional flow controller (1) according to the invention, as is typically used in a heating and domestic water system. The structure shown clearly comprises two functional main lines, namely the domestic water line (2) and the heating water line (3), which are integrated within a compact housing. The domestic water line (2) has a domestic water inlet (4) which opens into a measuring chamber (5). Arranged in this measuring chamber is a measuring element (6), which in turn is connected to a domestic water outlet (7). The heating water line (3) consists of a heating water inlet (8), an actuating chamber (9) with an integrated actuating element (10), and a heating water outlet (11).The entire flow path is controlled by the movements of a lifting part (13), which is influenced by a stroke sensor surface that reacts to pressure and / or flow impulses, so that a corresponding stroke (12) occurs. The lifting part (13) acts mechanically on the actuator (10). The return stroke of the lifting part (13) occurs against a return spring (14). A sealing membrane (15) is provided between the lifting part (13) and the stationary housing part (16) to ensure reliable sealing. The stationary housing part (16) is connected via a thread (20) to a cap (17) which forms a displacement chamber (18) and accommodates the return spring (14). A union nut (19) is used to tighten the cap (17), whereby the collar (21) of the cap has an external knurling (22). In addition, a first (23) and a second transverse access (25) are provided on the service water line, which can be closed with threaded caps (24).The push rod (26) extends between the sanitary side (27) and the heating side (28) of the regulator. A spring (29) additionally acts on the push rod (26). The sanitary side housing section (30) is connected to the heating side housing section (31) via a sleeve (35). A sealing chamber (32) is integrated into this connection, which contains a lubrication chamber (33). An O-ring (34) on the sanitary side, which is preferably mounted in a water-free manner, ensures additional sealing. The sleeve (35) extends over a circumferential section (36) and is secured using a toggle screw (37). A fastening eye (38) allows installation. On the front side there is a front inlet (39), where the extent of the protrusion (40) of the push rod (26) is shown in relation to the nozzle diameter (41). The front end of the push rod (43) can also be seen.

[0435] Fig. 2 shows the same proportional flow regulator (1) in a frontal external view of its front side. The allocation of the functional units corresponds to that in Fig. 1, but here the external structure of the housing is better illustrated. The connection pieces of the domestic water line (2) and the heating water line (3) as well as the arrangement of the first and second transverse accesses (23, 25), each provided with threaded caps (24), can be seen. The union nut (19) with its distinctive outer knurling (22) encloses the cap (17), the collar (21) of which is visible. The sanitary side housing section (30) has an elongated hole structure (44) which serves as an anti-twist device. A protruding bolt (45) is provided in this context as a stop element. Also visible are the first transverse access into the heating water line (47) and the second transverse access (48).The front end of the push rod (43) exits at the front inlet (39), whereby the protrusion dimension (40) can be seen in relation to the nozzle diameter (41).

[0436] Fig. 3 shows the proportional flow regulator (1) in the same orientation as in Fig. 2, but with a screwed-on cap (42) instead of the open front inlet (39). The regulator is thus configured for two-way operation. The remaining elements largely correspond to the illustration in Fig. 2.

[0437] Fig. 4 illustrates the proportional flow regulator (1) in a perspective view, which more clearly highlights the spatial arrangement of the components. Particularly striking is the transition from the sanitary side housing section (30) to the heating side (28) via the sleeve (35) with the surrounding section (36), in which the toggle screw (37) acts as a fixing element. The transverse accesses (23, 25) are clearly visible and separated from one another. The rear access (49) in the heating water line (3) is also shown.

[0438] Fig. 5 shows the proportional flow regulator (1) in a left-hand side view. The eye-catcher here is the cap (17) with external knurling (22), which is secured by the union nut (19). The transverse inlets (23, 25) and their threaded cap (24) are clearly visible, as are the domestic water inlet (4), the mounting eyelet (38), and the position of the collar (21).

[0439] Fig. 6 shows the proportional flow regulator (1) from its rear. This view clearly shows the rear transverse access ports (49, 50). The structure of the heating side housing section (31), the front inlet (39) with cap (42), the heating water inlet (8), the heating water outlet (11), as well as the elongated hole (44), the sleeve (35), the toggle screw (37), the mounting eye (38), and the sanitary side housing section (30) are clearly shown.

[0440] Fig. 7 shows a further, detailed longitudinal section through the proportional flow regulator (1). The routing of the push rod (26) through the entire component is particularly clearly visible. The position and function of the sealing chambers (32, 46) with their respective O-ring seals (34) and the lubrication chamber (33) are clearly visible. In addition, the position of the measuring element (6) and its connection to the measuring chamber (5) in relation to the stroke part (13) and the return spring (14) is illustrated particularly vividly.

[0441] Fig. 8a shows the proportional flow controller (1) according to the invention with a schematic flow diagram for two-way operation. The closure cap (42) closes the front inlet (39) so that it is not involved in the media flow. The flow shown shows the inlet of the heating water through the heating water inlet (8), the control by the actuator (10) and the outlet via the heating water outlet (11), while the domestic water is passed through the domestic water line (2) and in the process activates the flow pulse control. Fig. 8b shows the same proportional flow controller (1) with the front inlet (39) open in three-way operation. The additional inlet via the front inlet changes the flow direction within the heating water line (3), thereby achieving a changed control characteristic. The flow directions shown are color-coded and demonstrate the versatile adaptability of the controller during system operation. Fig.Finally, Figure 9 shows schematically an implementation of the invention in a home station.

[0442] List of reference symbols

[0443] 1 - Proportional flow controller

[0444] 2 - Domestic water line

[0445] 3 - Heating water line

[0446] 4 - Domestic water inlet

[0447] 5 - Measuring chamber

[0448] 6 - Measuring element

[0449] 7 - Domestic water drain

[0450] 8 - Heating water inlet

[0451] 9 - Control chamber

[0452] 10 - Actuator

[0453] 11 - Heating water drain

[0454] 12 - Hub

[0455] 13 - Lifting part

[0456] 14 - Return spring

[0457] 15 - Sealing membrane

[0458] 16 - fixed housing part

[0459] 17 - Cap

[0460] 18 - displacement

[0461] 19 - Union nut

[0462] 20 - Thread with the fixed housing part (16)

[0463] 21 - Collar of the cap (17)

[0464] 22 - External knurling

[0465] 23 - first cross access to the domestic water line

[0466] 24 - Threaded cap

[0467] 25 - second cross access to the domestic water line

[0468] 26 - Push rod

[0469] 27 - Sanitary side

[0470] 28 - Heating side

[0471] 29 - Suspension 30 - Sanitary side housing part

[0472] 31 - Heater side housing part

[0473] 32 - Sealing chamber in the sanitary side housing part (30)

[0474] 33 - Lubrication chamber

[0475] 34 - sanitary O-ring (stored water-free)

[0476] 35 - Sleeve

[0477] 36 - Encircling route

[0478] 37 - Thumb screw

[0479] 38 - Mounting eye

[0480] 39 - Front inlet

[0481] 40 - Degree of protrusion

[0482] 41 - nozzle diameter

[0483] 42 - External polygon

[0484] 43 - Front end of the push rod

[0485] 44 - Long hole of the sleeve

[0486] 45 - protruding bolt (screwed in)

[0487] 46 - heating-side sealing chamber

[0488] 47 - first cross access into the heating water line (into the heating water supply)

[0489] 48 - second cross access into the heating water line (into the heating water drain)

[0490] 49 - first rear cross access (into the heating water supply)

[0491] 50 - second rear cross access (into the heating water drain)

Claims

Patent claims 1. Proportional flow controller for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein the stroke sensor surface acts against a return spring during the stroke of the stroke part,wherein a diaphragm seal with a sealing membrane is provided between the lifting part and a fixed housing part of the proportional flow regulator, wherein the fixed housing part has a cap which forms a displacement space around the stroke of the lifting part and / or around a return spring, characterized in that the cap has a mechanical anti-twist device.

2. Proportional flow regulator according to claim 1, characterized in that the cap and the fixed housing part have an alignment aid which interacts with one another.

3. Proportional flow regulator according to claim 1 or 2, characterized in that the cap has a tensioner, in particular a lever mechanism or a union nut, which cooperates with the fixed housing part by means of a thread.

4. Proportional flow regulator according to one of the preceding claims, characterized in that the cap has a collar and holds the sealing membrane with the fixed housing part on the outside, while the sealing membrane is held on the inside on the lifting part.

5. Proportional flow regulator according to claims 3 and 4, characterized in that a union nut with an external knurling is provided as a tensioner, which engages around the collar of the cap and cooperates with its internal thread with an external thread on the fixed housing part, so that the union nut, when tightened, strengthens the sealing effect of the diaphragm seal and at the same time strengthens the sealing diaphragm against twisting.

6. Proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the service water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the service water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, characterized in that the service water line additionally has a transverse access.

7. Proportional flow regulator according to claim 6, characterized in that the transverse access has a transverse access nozzle, in particular having an external thread, wherein the transverse access nozzle is preferably closed fluid-tight with a threaded cap when not in use.

8. Proportional flow regulator according to claim 6 or 7, characterized in that it has two transverse accesses.

9. Proportional flow regulator according to claim 8, characterized in that it has exactly two transverse accesses and that the two transverse accesses are arranged coaxially on opposite sides of the proportional flow regulator and from the two opposite sides each have a half-inch thread to the outside and an open mouth into the measuring chamber to the inside.

10. Proportional flow controller according to one of claims 6 to 9, characterized in that one or both cross accesses have a safety valve and / or a flow switch and / or a temperature sensor and / or another sensor. 11 . Proportional flow controller, in particular according to one of the preceding claims, for use in a heating and domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided, by means of which the stroke part realizes the operative connection and actuates the actuator in the direction of the stroke during a stroke, wherein the push rod comprises an austenitic stainless steel, in particular stainless steel 1.4301, 1.4307, 1.4401, 1.4404, 1.4571, 1.4435, 1.4541 or 1.4016, preferably 1.4401, and in particular consists thereof, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line.

12. Proportional flow regulator according to claim 11, characterized in that the push rod on the sanitary side is coupled to the lifting part with a mechanical coupler and on the heating side has its own spring for resetting during lifting.

13. Proportional flow regulator, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided, by means of which the stroke part realizes the operative connection and, when moved, actuates the actuator in the direction of the stroke,wherein the proportional flow controller comprises a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and wherein the heating side housing part forms the heating water line, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, wherein a seal of the push rod is provided, characterized in that the seal has a sealing chamber within the sanitary side housing part which extends longitudinally along the push rod and in which the seal has two spaced-apart O-rings, namely a sanitary-side O-ring and a heating-side O-ring, which form a lubrication chamber with a quantity of lubricant between them, wherein the quantity of lubricant can in particular comprise an oil, a graphite, a grease, a powder and / or a paste.

14. Proportional flow regulator according to claim 13, characterized in that the sealing chamber has a further sanitary-side O-ring in addition to the sanitary-side O-ring.

15. Proportional flow regulator according to claim 13 or 14, characterized in that the sealing chamber is arranged in the sanitary-side housing part, but preferably the sanitary-side O-ring is mounted water-free.

16. Proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided, by means of which the stroke part realizes the operative connection and, upon stroke, actuates the actuator in the direction of the stroke, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, wherein a seal of the push rod is provided between the sanitary side and the heating side, characterized,that the proportional flow regulator has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and wherein the heating side housing part forms the heating water line, wherein the two housing parts are connected to each other, namely with a surrounding collar which is designed as a sleeve surrounding the other housing part and preferably starts from the heating-side housing part and surrounds the sanitary-side housing part along a surrounding section, wherein a stuffing box is provided between the sleeve and the enclosed housing part within the surrounding section.

17. Proportional flow regulator according to claim 16, characterized in that the two housing parts are tightened against each other within the enclosure by means of a toggle, in particular by means of a self-centering toggle screw with a threaded bore in the sleeve.

18. Proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part,wherein the sanitary side housing part forms the domestic water line and wherein the heating side housing part forms the heating water line, wherein the two housing parts are connected to each other, characterized in that, one of the two housing parts has a threaded hole of size M3, M4 or M5, wherein the threaded hole is preferably aligned transversely to a longitudinal direction of the proportional flow regulator and / or one of the two housing parts has a threaded hole in the form of a fastening eye, preferably arranged on an inlet nozzle or outlet nozzle, especially on the domestic water line.

19. Proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein the proportional flow controller has a front inlet on the heating side in addition to the heating water inlet, wherein the domestic water inlet, the domestic water outlet, the heating water inlet, the heating water outlet and the front inlet each have an external threaded connector, characterized in that all five external threaded connectors have flat-sealing %-inch threads.

20. Proportional flow regulator, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided, by means of which the stroke part realizes the operative connection and, when moved, actuates the actuator in the direction of the stroke, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, characterized in that the proportional flow controller on the heating side has, in addition to the heating water inlet, a front inlet, wherein the front inlet has an externally threaded nozzle, wherein the push rod in the neutral position protrudes axially from the nozzle by a maximum of the size of a nozzle diameter.

21. Proportional flow regulator according to claim 20, characterized in that the front inlet has a nozzle cap and a tensioner, in particular a lever mechanism or a union nut, which cooperates with the nozzle of the front inlet by means of a thread.

22. Proportional flow regulator according to claim 21, characterized in that the nozzle cap has a collar and a union nut, in particular with an external polygon, is provided as a tensioner, which engages around the collar of the nozzle cap and cooperates with its internal thread with an external thread on the nozzle, so that the union nut seals the front inlet when tightened.

23. Proportional flow regulator according to one of claims 21 or 22, characterized in that the nozzle cap encloses a front end of the push rod.

24. Proportional flow regulator according to one of claims 21 to 23, characterized in that the nozzle cap encloses a spring which acts on the push rod to reset it during the stroke.

25. Proportional flow controller, in particular according to one of the preceding claims, for use in a heating and domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet, and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and wherein the heating side housing part forms the heating water line,wherein the two housing parts are connected to each other, namely by means of a surrounding collar which is designed as a sleeve enclosing the other housing part and preferably extends from the heating-side housing part and encloses the sanitary-side housing part along a surrounding section, characterized in that the sleeve has a coaxially rotatable bearing relative to the enclosed housing part, wherein a maximum angle of rotation is limited by a first stop and a second stop.

26. Proportional flow regulator according to claim 25, characterized in that the sleeve has an elongated hole with a tangential extension, the elongated hole defining the two stops.

27. Proportional flow regulator according to claim 25 or 26, characterized in that the enclosed housing part has a stop element, in particular a radially projecting bolt.

28. Proportional flow regulator according to one of claims 25 to 27, characterized in that the proportional flow regulator has a rotation angle-controlled flow cross-section sensor, so that when the sleeve is rotated relative to the enclosed housing part, the kvs value of the domestic water line and / or the heating water line is adjusted, in particular with the largest or the smallest kvs value at the two stops.

29. Method for selecting the kvs value on a proportional flow controller in a heating domestic water system, in particular on a proportional flow controller according to one of the preceding claims, wherein the proportional flow controller has a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the service water line and wherein the heating side housing part forms the heating water line, wherein the two housing parts are connected to one another, in particular with a surrounding collar which is designed as a sleeve surrounding the other housing part and preferably starts from the heating-side housing part and surrounds the sanitary-side housing part along a surrounding section, characterized in that a potential heating-side housing part is selected from a plurality of different potential heating-side housing parts with a view to a desired kvs value or a desired kvs range and this is connected to the sanitary side housing part.

30. Proportional flow regulator, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the lifting part has an operative connection to the actuator, wherein the proportional flow regulator has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and wherein the heating side housing part forms the heating water line, characterized in that a holder of size M3, M4 or M5, in particular M4, is provided for an adjustment tool for a heating-side sleeve.

31. Proportional flow regulator, in particular according to one of the preceding claims 1 to 28 or 30, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein a push rod is provided, by means of which the lifting part realizes the operative connection and, upon stroke, actuates the actuator in the direction of the stroke, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and wherein the heating side housing part forms the heating water line, wherein the push rod extends from a sanitary side of the proportional flow controller, in particular from the domestic water line, to a heating side of the proportional flow controller, in particular to or through the heating water line, wherein a seal of the push rod is provided, characterized in that the seal within the heating side housing part has a sealing chamber extending longitudinally along the push rod, in which the seal has two spaced-apart O-rings and a third O-ring,preferably a sanitary-side O-ring and two heating-side O-rings, wherein a lubrication chamber with a quantity of lubricant is preferably formed between the sanitary-side O-ring and the two heating-side O-rings, wherein the quantity of lubricant can in particular comprise an oil, a graphite, a grease, a powder and / or a paste.

32. Proportional flow controller, in particular according to one of the preceding claims, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet as well as the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, wherein the proportional flow controller has a sanitary side housing part and a heating side housing part, wherein the sanitary side housing part forms the domestic water line and wherein the heating side housing part forms the heating water line, characterized in that a stuffing box is provided on a heating-side sleeve.

33. Proportional flow controller, in particular according to one of the preceding claims 1 to 28 or 30 to 32, for use in a heating domestic water system, with one domestic water line and one heating water line, whereby the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, characterized in that the heating water line additionally has a transverse access into the heating water inlet.

34. Proportional flow regulator according to claim 33, characterized in that the transverse access has a transverse access nozzle, in particular having an internal thread, wherein the transverse access nozzle is preferably closed in a fluid-tight manner with a threaded plug when not in use.

35. Proportional flow regulator, in particular according to one of the preceding claims 1 to 28 or 30 to 34, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is in operative connection with a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow pulse, so that pressure and / or flow in the domestic water line cause the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a stroke part, wherein the stroke part has an operative connection to the actuator, characterized in that the heating water line additionally has a transverse access into the heating water drain.

36. Proportional flow regulator according to claim 35, characterized in that the transverse access has a transverse access nozzle, in particular having an internal thread, wherein the transverse access nozzle is preferably closed in a fluid-tight manner with a threaded plug when not in use.

37. Proportional flow regulator according to claims 33 to 34 and 35 to 36, characterized in that it has exactly two transverse inlets in the heating water line and that the two transverse inlets are arranged, preferably axially parallel, on the same side of the proportional flow regulator.

38. Proportional flow regulator, in particular according to one of the preceding claims 1 to 28 or 30 to 36, for use in a heating domestic water system, with a domestic water line and a heating water line, wherein the domestic water line has a domestic water inlet, a measuring element and a domestic water outlet and the heating water line has a heating water inlet, an actuator and a heating water outlet, wherein the measuring element has a stroke sensor surface which is operatively connected to a measuring chamber in the domestic water line and is designed to respond to pressure and / or flow impulses, so that pressure and / or flow in the domestic water line causes the stroke sensor surface to move, wherein the stroke sensor surface is mechanically connected to a lifting part, wherein the lifting part has an operative connection to the actuator, characterized in that the heating water line - has one or two additional front cross accesses on a front side, namely o a first front cross access into the heating water inlet and / or o a second front cross access into the heating water outlet, - and additionally has one or two rear cross accesses on one side, namely o a first rear cross access into the heating water inlet and / or o a second rear cross access into the heating water outlet.

39. Proportional flow regulator according to claim 38, characterized in that the transverse inlets of the heating water line have exactly two different sizes, in particular a quarter inch and a half inch.

40. Proportional flow controller according to claim 39, characterized in that the Front a first size, preferably only the first size, and the Back has a second size, preferably only the second size, in particular the front a quarter inch and the back a half inch.

41. Proportional flow regulator according to one of claims 38 to 40, characterized in that the transverse inlets of the heating water line are all axially parallel to one another.

42. Proportional flow regulator according to one of claims 38 to 41, characterized in that the transverse inlets of the heating water line all have an internal thread.

43. Apartment station for use in a heating and domestic hot water system, as a transfer unit for heating heat and for decentralized domestic hot water heating using the heating heat, wherein the apartment station has a series of connections for connection to central building lines and to apartment lines, namely on the building side at least to a domestic hot water supply line, a heating water supply line and a heating water return line and on the apartment side at least to a cold and hot water line to taps in the apartment and to a heating flow of the apartment and to a heating return of the apartment, wherein the apartment station has a heat exchanger, in particular a counterflow heat exchanger, characterized in that the apartment station has a proportional flow controller according to one of claims 1 to 28 or 30 to 43.

44. Heating and domestic water system for a building with several apartments, with a central heating water production and a distribution of heating water and cold domestic water to a plurality of apartment stations for transferring the heating water to the plurality of apartments and for decentralized domestic water heating there by means of the heating water, characterized in that the heating domestic water system has a plurality of apartment stations according to claim 43.

45. A building with a plurality of apartments and with a central heating water production and a distribution of heating water and cold domestic water to a plurality of apartment stations for transferring the heating water to the plurality of apartments and for decentralized domestic water heating there by means of the heating water, characterized in that the building has a heating-domestic water system according to claim 44.

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