Door closer with a stop valve

Abstract

The present invention relates to a door closer with a driver and a check valve (1). The check valve is equipped with a housing (10) having at least two openings (11, 12) through which a working medium can flow through the check valve (1), an actuator (20) which is integrated into the housing (10), a sealing body (22) which can form a sealing seat with the housing (10) around a first opening (11), and a first magnetic element (21), and a trigger (30) which is arranged outside the housing (10) and hermetically separated from the actuator (20), has a second magnetic element (31), and can assume at least two states in order to open and close the check valve. The driver (202) is connected to the trigger (30) of the check valve (1) in order to bring it into the first or second state.

Description

[0001] The present invention relates to a door closer with a check valve, with magnetic control, a check valve, in particular for a door closer, and a magnetically controllable check valve system with a check valve and a working valve.

[0002] Door locking systems with door closers are technical security solutions integrated into doors to ensure automatic closing or locking. These systems are used in a variety of environments, from residential buildings to commercial or industrial facilities. In the context of door locking systems with door closers, door closers are mechanical devices installed on doors that automatically ensure the door closes after being opened. These mechanical components vary in design and can include hydraulic, pneumatic, or electromechanical models.

[0003] Check valves are valves that can shut off a volume flow of a gas or liquid and are therefore devices for the controlled opening and closing of flow openings or lines. Check valves are widely used, for example in air treatment systems, fuel units, the water industry or in door locking mechanisms.

[0004] A check valve in a door closer is a mechanical device used to regulate the flow of gases such as air or hydraulic fluids. It is usually located inside the door closer and can be operated mechanically or electrically. When the check valve is closed, the pneumatic or hydraulic flow is blocked, causing the door closer to lock in the closing direction and the door to remain in a specific position. Opening the check valve allows the door closer to be reactivated to close the door. This mechanism allows for flexible control of door movement and is particularly useful in situations where a temporary fixation of the door in a specific position is required.

[0005] In manually activated shut-off valves, the actuating force, i.e., the force required to operate the valve, is typically introduced via a valve-regulating component. When manually actuated, this component has contact with the working medium on one side and protrudes from the valve into the environment on the other. It thus inevitably penetrates the system boundary. This places high demands on the sealed and moving components, making them susceptible to wear. Failure of these components, particularly at the valve's sealing points, can lead to leaks.

[0006] The actuating force required for this conventional type of check valve is also significantly higher. This results in stiff operation and thus high stress on the mechanical components acting on the check valve. Also problematic and complex is the transmission and forwarding of the actuating force for manually operated valves and the supply of the power supply to the door leaf and the door closer for electromagnetic valves. In door closing mechanisms, this can cause damage in the form of increased wear and tear or even total failure of the mechanism. Electronic solenoid valves solve some of these problems, but have the disadvantage of requiring a power supply and an electrical switching unit. These are both more bulky and more expensive than permanent magnets.

[0007] For this reason, permanent magnets are used in known check valves. The valve is actuated via a hermetically separated component, thereby minimizing leaks and wear. DE 40 16 040 A1 describes such a check valve. The blocking body of the check valve is connected to a permanent magnet. The load on the blocking body is caused by a second magnet, which acts on the magnet with magnetic repulsion through a partition wall that hermetically seals the fluid medium from the atmosphere. The magnet is located in a sliding sleeve that can be swapped around so that the blocking body can be lifted from the valve seat by magnetic force for venting purposes. The closing force of the blocking body can be changed by changing the distance between the two magnets. The valve can be opened for venting purposes by swapping the sleeve.When the magnetic force is reduced or the trigger is completely removed, this check valve is opened and is referred to as "normally open" (NO). However, the NO function of conventional check valves can cause problems in hydraulic manual door closers, as it requires a high actuating force and can only switch very low pressures.

[0008] Against this background, the present invention is based on the object of creating a door closer with a check valve, wherein the valve avoids one or more disadvantages of the known check valves and, in particular, reliably assumes a blocking position in a neutral, unaffected state.

[0009] According to one aspect of the present invention, a door closer is provided with a driver and a check valve, the check valve comprising: a housing with at least two openings through which a working medium can flow through the check valve, an actuator integrated into the housing, with a sealing body that can form a sealing seat with the housing around a first opening, and with a first magnetic element, and a trigger that is arranged outside the housing and hermetically separated from the actuator, has a second magnetic element, and can assume at least two states, wherein at least one of the magnetic elements has a permanent magnet and the other magnetic element has a permanent magnet or a ferromagnet, wherein in a first state of the trigger, no magnetic force or a first magnetic force acts between the magnetic elements and the actuator is automatically in a first position in which it blocks the first opening and forms a sealing seat with the housing around this opening,wherein in a second state of the trigger, a second magnetic force acts between the magnetic elements, by means of which the actuator is brought into a second position in which it is lifted from the sealing seat and releases the first opening, wherein the actuator, when the trigger is brought from the second state to the first state, automatically returns to the first position, even if no magnetic force acts between the magnetic elements, and wherein the driver is connected to the trigger of the check valve in order to bring it into the first or second state.

[0010] According to a further aspect of the present invention, a door closer with a check valve system is provided, with a check valve as described here, which serves as a control valve and a working valve with a working valve housing and a working valve actuator which is integrated into the working valve housing, wherein the working valve housing has a working valve inlet, a first working valve outlet and a second working valve outlet, wherein the second working valve outlet is connected to the second opening of the check valve.

[0011] In further aspects, the present invention relates to a check valve and a check valve system.

[0012] Preferred embodiments of the invention are defined in the dependent claims. It is understood that the claimed check valve and the claimed check valve system have similar and / or identical preferred embodiments to the claimed door closer, in particular as defined in the dependent claims and as disclosed herein.

[0013] The invention is based on the idea of ​​designing a door closer with a check valve or check valve system (hereinafter referred to simply as "check valve") in such a way that an easy-to-manufacture, absolute seal is created between the working chamber of the check valve and the environment. This check valve requires a low actuating force and has a small required installation space with a low-complexity design. The present check valve of the door closer is simple and cost-effective to manufacture and allows for easy integration into a wide variety of door closing mechanisms. In addition, it features a reversal of the initiated actuating variable to the reaction effect in the check valve, i.e., raising the trigger causes the actuator to lower and vice versa, which facilitates use in a door closer with a lever and a slide rail.

[0014] A normally closed (NC) valve characteristic offers the advantage that an unaffected shut-off valve automatically remains in its system-safe locking position. Furthermore, the design is position-independent, and no external power supply is required for its operation. Furthermore, high pressures can be switched with low actuating force, thus reducing the magnetic force requirements.

[0015] Preferably, the magnetically controlled shut-off valve with NC function should prevent leaks and be closed when the magnetic force is reduced or the trigger magnet is completely removed.

[0016] High applied pressures in the system require a reduction in the diameter of the check valve's outlet opening, which only allows a reduced volume flow. Conversely, the requirement for a high volume flow requires only a very low system pressure. To overcome the problems associated with high volume flows or pressures, a check valve system is provided that, with low actuating force, realizes the desired function of a check valve both at high applied pressures and at high required volume flows. The check valve system comprises a check valve and a connected operating valve. Fundamentally, this reduces the requirement to a practical size of the check valve, while still allowing larger volume flows or pressures to be reliably controlled via the operating valve.

[0017] According to the invention, the door closer comprises a check valve and a follower. The check valve is designed with a housing having at least two openings through which a working medium, such as hydraulic fluid, can flow through the check valve. An actuator is integrated into this housing, comprising a sealing body that can form a sealing seat with the housing around a first opening, and a first magnetic element (also known as a control / adjusting or regulating element). A trigger is arranged outside the housing. This trigger is hermetically separated from the actuator, has a second magnetic element, and can assume at least two states.

[0018] At least one of the two magnetic elements has a permanent magnet, and the other magnetic element has a permanent magnet or ferromagnetic material. This allows a magnetic force to act between the two magnetic elements, resulting in attraction or repulsion, depending on their relative positions.

[0019] The actuator can be designed such that in a first state (e.g., a first relative position, orientation, distance, etc. to one another), either no magnetic force or a first magnetic force acts between the two magnetic elements. For example, the distance between the magnetic elements is increased and their magnetic attraction is reduced or completely eliminated. The actuator is automatically pressed into the sealing seat and is in a first position in which it blocks the first opening and forms a sealing seat with the housing around this opening. The working medium cannot flow through the valve, and the valve is closed.

[0020] In a second state of the actuator, a second magnetic force then acts between the magnetic elements. For example, the distance between the magnetic elements is reduced and their magnetic attraction force is increased. This attraction force must be greater than the sealing force in the valve, i.e., the pressure-dependent contact force and the position-dependent weight of the actuator. As the magnetic elements approach each other, the actuator is moved into a second position in which it is lifted from the sealing seat and releases the first opening. This allows the working medium to flow through the valve, and the valve is opened.

[0021] The actuator is further designed so that when the actuator is moved from the second state to the first state, it automatically returns to the first position. The actuator is pressed into the sealing seat, blocking the first opening and preventing the working fluid from flowing through the shut-off valve. This applies even if no magnetic force acts between the magnetic elements.

[0022] In a structural design of the shut-off valve, the first opening of the housing can be arranged in a bottom surface of the housing opposite the trigger and the second opening can be arranged in a circumferential surface of the housing.

[0023] In an alternative embodiment, a return spring is also arranged in the housing. This spring exerts a restoring force on the actuator in the direction of the first opening and supports the actuating element into the sealing seat to close the shut-off valve, even if there is no magnetic force acting between the magnetic elements, for example, if the trigger is defective or removed. The attractive force of both magnetic elements in the second state of the trigger must therefore be additionally greater than the spring force to move the actuator into the second position and open the shut-off valve. The return spring thus ensures the NC valve characteristic and a fast response of the shut-off valve.

[0024] Preferably, the first opening is designed as an outlet for the working medium for connection to a working medium discharge and the second opening is designed as an inlet for the working medium for connection to the working medium supply. The first opening thus functions as an outlet and the second opening thus functions as an inlet for the working medium. When the shut-off valve is open, the working medium flows from the inlet past the actuator to the outlet. Preferably, the actuator and the second opening are designed such that the working medium flowing in through the second opening exerts a force on the actuator in the direction of the first opening. The hydraulic contact force or flushing effect of the working medium presses the actuator into the sealing seat.This automatically holds the actuator in the first position, blocking the first opening and closing the valve depending on the system pressure, even if there is no magnetic force acting between the magnetic elements, for example, if the actuator is defective or removed. The NC valve characteristic is thus ensured by the working medium itself. A return spring, as provided in this design, is therefore unnecessary.

[0025] The actuator and the second opening are preferably designed such that the second opening is open in both the first and second positions of the actuator. This allows the working fluid to flow into the check valve, in particular a cavity around the actuator, both when the valve is closed and open, and to build up pressure there, pressing the actuator into the sealing seat. Only when the valve is open can the working fluid flow through the check valve.

[0026] In a further embodiment, the housing can have a recess in a cover surface opposite the first opening, into which the trigger can be inserted into the second position. This brings the two magnetic elements closer together, creating an increased magnetic force between them and moving the actuator into the second position.

[0027] The trigger can be designed and arranged in different ways. For example, in another embodiment, the trigger is configured such that it can switch back and forth between the first and second states by displacement in a plane transverse to the longitudinal axis of the shut-off valve and / or by displacement in the direction of the longitudinal axis and / or by rotation about the axis perpendicular to the longitudinal axis. The second magnetic element is thereby brought closer to the first magnetic element, and an increased magnetic force acts between them. The actuator is thereby moved into the second position, and the shut-off valve is opened.

[0028] In another embodiment, both the first and second magnetic elements are permanent magnets. These are arranged so that opposing magnetic poles face each other, and as the trigger approaches the actuator, an increased magnetic force acts between the two magnetic elements.

[0029] In a further embodiment, two magnetic elements in the form of permanent magnets with opposite magnetization directions are arranged in the trigger. In each of the two states assumed by the trigger, one of the two permanent magnets of the trigger is arranged opposite the first magnetic element of the actuator in order to exert either a repulsive magnetic force or an attractive magnetic force on the first magnetic element of the actuator.

[0030] In a further embodiment, the check valve is part of a check valve system and serves as a control valve in combination with a working valve to reliably control larger volume flows or pressures. The working valve has a working valve housing and a working valve actuator which is integrated into the working valve housing. The working valve and the control valve can also share a housing, for example the door closer housing. The working valve housing has a working valve inlet, a first working valve outlet and a second working valve outlet. The second working valve outlet is connected to the second opening of the check valve. As a result, when the check valve is closed, the pressure in the working valve cannot escape through the second working valve outlet and the working valve actuator closes the working valve inlet. The pressure in the working valve and thus also its opening and closing are regulated accordingly.

[0031] In a further embodiment, the check valve system further comprises a working valve spring within the working valve housing. This spring exerts a spring force on the working valve actuator toward the working valve inlet, pressing the working valve actuator into the position where it closes the working valve inlet.

[0032] Preferably, the working valve actuator has a continuous passage bore centrally along its longitudinal axis. Through this passage, a small portion of the working medium can flow from the working valve inlet to the second working valve outlet and then through the second opening into the shut-off valve. When the shut-off valve closes, the backflow of the working medium moves the working valve actuator into the position where it closes the working valve inlet.

[0033] According to a further aspect of the present invention, a check valve is provided comprising: a housing with at least two openings through which a working medium can flow through the check valve, an actuator which is integrated into the housing, with a sealing body which can form a sealing seat with the housing around a first opening, and with a first magnetic element, and a trigger which is arranged outside the housing and hermetically separated from the actuator, has a second magnetic element and can assume at least two states, wherein at least one of the magnetic elements comprises a permanent magnet and the other magnetic element comprises a permanent magnet or a ferromagnet, wherein in a first state of the trigger no magnetic force or a first magnetic force acts between the magnetic elements and the actuator is automatically in a first position in which it blocks the first opening and forms a sealing seat with the housing around this opening, wherein in a second state of the trigger a second magnetic force acts between the magnetic elements, by means of which the actuator is brought into a second position in which it is lifted from the sealing seat and releases the first opening, and wherein the actuator, when the trigger is brought from the second state to the first state, automatically assumes the first position again, even if no magnetic force acts between the magnetic elements.

[0034] According to a further aspect of the present invention, a door closer with a check valve system is provided, with a check valve as described here, which serves as a control valve and a working valve with a working valve housing and a working valve actuator which is integrated into the working valve housing, wherein the working valve housing has a working valve inlet, a first working valve outlet and a second working valve outlet, wherein the second working valve outlet is connected to the second opening of the check valve.

[0035] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0036] Embodiments of the invention are illustrated in the following drawings and explained in more detail in the following description. They show: Fig. 1 is a schematic representation of a cross section through a first embodiment of the shut-off valve according to the invention in the closed state; Fig. 2 is a schematic representation of a cross section through the Fig. 1shown check valve in the open state; Fig. 3 is a schematic representation of a cross section through a second embodiment of the check valve according to the invention with a return spring; Fig. 4 is a schematic representation of a cross section through a third embodiment of the check valve according to the invention with a movable trigger and a permanent magnet; Fig. 5 is a schematic representation of a cross section through a fourth embodiment of the check valve according to the invention with a movable trigger and two permanent magnets; Fig. 6 is a schematic representation of a cross section through a fifth embodiment of the check valve according to the invention with a rotatable trigger and a permanent magnet; Fig. 7 is a schematic representation of a cross section through a sixth embodiment of the check valve according to the invention with a rotatable trigger and two permanent magnets;Fig. 8 is a schematic representation of a cross section through a seventh embodiment of the shut-off valve according to the invention with a rotatable trigger and three permanent magnets; Fig. 9 is a schematic representation of a cross section through a shut-off valve system according to the invention with the shut-off valve and a working valve in the closed state; Fig. 10 is a schematic representation of a cross section through the shut-off valve system according to the invention with the shut-off valve and a working valve in the closed state. Fig. 9 shown check valve system in the open state; Fig. 11 a schematic representation of a cross section through a door closer with a check valve in the open state; Fig. 12 a schematic representation of a cross section of the Fig. 11shown door closer with a check valve in the closed state; Fig. 13 is a schematic representation of a cross section through a second embodiment of the door closer with a check valve system in the open state; Fig. 14 is a schematic representation of a cross section through a moving leaf unit with the door closer according to the invention with a check valve; and Fig. 15 is a schematic representation of a plan view of an open double-leaf door with a closing sequence control.

[0037] In the case of shut-off valves, such as those used in hydraulic, manual door closers, which are actuated manually, the actuating force must usually always be introduced to a valve-regulating component which necessarily penetrates the system boundary, has a contact point with the working medium on one side and protrudes from the system into the environment on the other side.

[0038] If the valve is closed by an external force acting on the actuator, a system-related pressure builds up within the valve. Depending on the application, the demands placed on the valve's sealing points can be very high. The ratio of system pressure to available installation space (valve size) is often very high. The main issue here is the sealing provided by the valve seal. Unlike the housing seal, this seal must not only be statically tight, but also ensure the smoothest possible movement while maintaining absolute tightness of the actuator.

[0039] This is often the critical point in the system. Excessive pressures (pressure peaks) cause the seal, which is very small due to the limited installation space, to fail and leakage occurs. Over the service life of the product, the sealing components age, are exposed to external influences and wear, which in turn negatively impacts the seal and leads to the medium to be sealed escaping from the working space into the environment. When designing the seal, a suitable critical ratio must be defined between the required actuating force introduced and the sealing effect of the sealing components, taking into account the system / environmental and service life influences. To guarantee sufficiently reliable function, the required actuating force on the shut-off valve increases relatively significantly, since a stiff seal is associated with an increased sealing effect.

[0040] The entire door closer can be filled with hydraulic fluid such as oil, which then serves as the working medium. By interrupting the flow in the check valve (system), a movement, such as the closing piston movement in the closing direction, can be blocked. Hydraulic fluid has the advantage over pneumatic fluid (gas) in that it is incompressible, non-aggressive, less volatile, lubricating, preservative, easier to seal, and has a lower temperature-dependent expansion coefficient. The following assumes (but is not essential for the invention) that the entire check valve is filled with the working medium at all times; thus, we refer to flows.

[0041] The check valve according to the invention, described below using various exemplary embodiments, eliminates or mitigates, among other things, this problem.

[0042] Fig. 1shows a schematic representation of a cross section through a first embodiment of the shut-off valve 1 according to the invention in the closed state. Fig. 2 shows this shut-off valve 1 in the open state. The shut-off valve 1 has a hollow cylindrical housing 10 with two openings 11, 12, an actuator 20, and a trigger 30, and is installed in an installation space 109. The actuator 20, which has a sealing body 22 and a first magnetic element 21 in the form of a permanent magnet, is integrated into the housing 10. The trigger 30 has a ferromagnetic second magnetic element 31, which can alternatively also be designed as a permanent magnet, and is arranged in a recess 17 in a cover surface 15 of the housing 10, into which it can be pushed in and out in the direction indicated by the arrow 110.

[0043] The first opening 11 is arranged in a base surface 13 opposite the actuator 30 and is connected to a working medium discharge 101 toward the lower system boundary 105 to discharge outflowing working medium. The first opening 11 thus acts as an outlet. Optionally, the first opening 11 is designed as a bore 51 in a bore cover 50, but can also be designed directly as an opening in the base surface. The second opening 12 is arranged in a circumferential shell surface 14 of the housing 10 and is connected to a working medium supply 102 to supply inflowing working medium to the valve. The second opening 12 thus acts as an inlet.

[0044] The housing 10, i.e. the hydraulic fluid therein, is sealed from the installation space 109 by a housing sealing ring 18. The optional bore cover 50 is sealed from the installation space 109 by another sealing ring 19.

[0045] In the first embodiment shown, the check valve 1 is closed. In this embodiment, the sealing body 22 has a spherical lower tip which forms a sealing seat with the housing 10 or bore cover 50 around the first opening 11 or bore 51 and prevents the working medium flowing through the second opening 12 into the cavity 16 of the housing 10 from flowing through the check valve 1 and escaping through the first opening 11. The working medium flowing in through the second opening 12 fills the cavity 16 of the housing 10 and thereby exerts a pressure- and outlet cross-section-dependent force on the actuator 20 in the direction of the first opening 11, whereby the actuator 20 is in the first position shown and prevents the working medium from flowing through this first opening 11.Depending on the design of the actuator 20, which is formed, for example, in the form of a piston, the cavity 16 can occupy a larger space or can also be designed as only a narrow gap between the actuator 20 and the housing 10.

[0046] In the first state of the trigger 30 shown, no or a reduced first magnetic force acts between the two magnetic elements 21, 31, depending on the position (location, orientation, distance) of the second magnetic element 31 with respect to the first magnetic element 21. This reduced (or non-existent) first magnetic force is not sufficient to lift the first magnetic element 21 and thus the actuator 20 in the direction of the cover surface 15.

[0047] According to the invention, by using one or more magnets in and on the valve, the manipulated variable is transmitted to the actuator 20 without a direct connection across the upper system boundary 103. This has the advantage that, on the one hand, the working chamber can be easily and solidly sealed against the environment 104. On the other hand, the actuating force is significantly reduced because friction on a valve seal, which is no longer required in the shut-off valve 1 according to the invention, is eliminated.

[0048] Will, as in Fig. 2As shown, when the ferromagnetic magnetic element 31 of the trigger 30 is brought closer to the magnet 21 of the actuator 20, their interaction (magnetic attraction) causes the entire actuator 20 to be lifted and thus opens the shut-off valve 1 against the system-related hydraulic contact force exerted by the inflowing working medium, the position-related gravity (present depending on the installation position of the shut-off valve 1), and any magnetic attraction force present between the magnet 21 and the optimal bore cover 50, which is made, for example, of ferromagnetic material. The working medium can then flow unhindered from the inlet 12 through the cavity 16 of the shut-off valve 1 to the outlet 11.

[0049] If the distance between the ferromagnet 31 of the actuator 30 and the permanent magnet 21 of the actuator 20 is increased, the magnetic attraction force is reduced again or cancels out the influence of the actuator 30 on the magnet 21, so that the hydraulic contact force / flushing effect due to the inflowing working medium presses the actuator 20 back into the sealing seat. The valve thus closes depending on the system pressure and has a normally closed (NC) characteristic. If the interaction between the magnetic elements 21 and 31 is restored by moving the actuator 30 back into the Fig. 2 shown position, the attractive force is sufficient to release the actuator 30 from the sealing seat and open the valve.

[0050] The shut-off valve 1 is preferably designed such that the attractive force (between the trigger 30 and the actuator 20 located in the sealing seat) is greater than the sealing force (pressure-dependent contact force plus the magnetic attractive force in the valve and the position-dependent weight of the actuator 30). The thickness of the separating layer in the valve cover between the trigger 30 (environment) and the magnet 21 (working chamber) and the valve stroke should be as small as possible to ensure the greatest possible interaction between the components and thus reliable function. The diameter of the bore 51 in the bore cover 50 must, on the one hand, be sufficiently large (working medium flow rate), but on the other hand, it must also be as small as possible, since the system-related, independently generated contact force in the valve is quadratically dependent on the valve and thus increases significantly with increasing bore diameter.

[0051] The illustrated design arrangement of the valve components with actuator (with magnet) and trigger facing away from the sealing seat often has the user-friendly effect that when the trigger 30 is approached, the valve is opened (cf. Fig. 2 ) and when the trigger 30 is removed, the shut-off valve 1 is blocked (cf. Fig. 1 This means that when the valve is deactivated, the valve characteristic automatically assumes the locking state, i.e., it has the NC (normally closed) valve characteristic. The valve locks in the direction of hydraulic flow. This mode of operation characterizes the inventive door closer with a locking valve and thus differs from known valves, such as those known from the aforementioned DE 40 16 040 A1.

[0052] Fig. 3shows a schematic representation of a cross-section through a second embodiment of the shut-off valve 1 according to the invention in the open state. In this embodiment, the second magnetic element 31 can be inserted into the recess 17 in the cover surface 15 by means of a trigger holder 32 and can thus be placed in the second state shown. As a result, the second magnetic element 31, which in this embodiment is designed as a permanent magnet, is brought closer to the first magnetic element 21, which is also designed as a permanent magnet. The two permanent magnets 21, 31 are arranged such that opposing magnetic poles lie opposite one another, so that in the state shown, an increased magnetic force acts between the two permanent magnets 21, 31. The actuator 20 is thereby brought into the second position shown, in which it is lifted from the sealing seat and exposes the first opening 11.The shut-off valve 1 is thus opened and the working medium can flow through the shut-off valve 1.

[0053] Furthermore, in the Fig. 3 In the embodiment shown, a return spring 40 is arranged within the cavity 16 in the housing 10. The return spring 40 exerts a restoring force on the actuator 20 in the direction of the bore cover 50 and the first opening 11 and presses the actuator 20 into the sealing seat when the second magnetic element 31 is removed or at least partially pushed out of the recess 17 and thus the magnetic force between the permanent magnets 21, 31 is reduced. In the embodiment shown in Fig. 3 In the inserted state of the magnetic element 31 shown, the attractive force of both magnetic elements 21, 31 is greater than the pressure-dependent contact force, the position-dependent weight force, the magnetic attraction force to the bore cover 50 and the restoring force of the return spring 40 in the valve, so that the valve is opened.

[0054] The fundamental principle of this embodiment is therefore the mode of operation in relation to the Figures 1 and 2 described processes are essentially identical. If the function of shut-off valve variant 1 is not guaranteed due to the applied system pressure (contact force in the valve increases) or the required outlet bore diameter (larger flow rate required), the ferromagnetic magnetic element 31 (cf. Figures 1 and 2 ) a permanent magnet is used in the trigger 30 (cf. Fig. 3 This applies to all designs that contain ferromagnets. The interaction (attractive force) between two magnets in the illustrated state is significantly higher.

[0055] This control variable can be varied by selecting suitable magnets, particularly by choosing the materials and / or dimensions. This allows significantly higher loads in the valve to be switched more reliably. To simplify the design or reduce the number of parts and to eliminate the negative influence of the return spring 40, which is usually made of magnetic material (ferromagnetic), on the functional attraction force, this embodiment, like the one shown in the Figures 1 and 2 The embodiment shown can also be designed without a return spring 40. The valve functions even when it is "upside down" and the weight of the moving parts in the valve acts in the opposite direction. Conversely, the Figures 1 and 2The embodiment shown can additionally be designed with such a return spring 40, preferably made of non-ferromagnetic or slightly ferromagnetic material. This results in a better and faster response of the valve and is advantageous for valves mounted upside down. Conversely, the weight force then does not act in the direction of the sealing seat, and the magnetic attraction to the bore cover 50 only works if it is made of ferromagnetic material.

[0056] A general advantage is that, both in the pairing of two magnets and in a magnet-ferromagnet pairing, the magnetic force decreases exponentially rather than linearly. This means that with two magnetic poles with opposing magnetic directions, even a relatively small distance between the two magnetic elements leads to a significant reduction in the attractive force. Conversely, the two elements should be placed as close together as possible to utilize a sufficiently strong attractive force. This requires a wall thickness that is as thin as possible, yet sufficiently strong.

[0057] Fig. 4 shows a schematic representation of a cross section through a third embodiment of the shut-off valve 1 according to the invention in the open state. Unlike the Figures 1 to 3In contrast to the embodiments shown, in this embodiment the trigger with the second magnetic element 31 is arranged outside the shut-off valve 1 and outside the upper system boundary 103. The trigger 30 is radially displaceable parallel to the cover surface 15 in a direction indicated by the arrow 120 in order to change the distance between the magnetic elements 21, 31 by changing the magnetic force acting through the housing wall between the two magnetic elements 21, 31, in order to thus open or close the shut-off valve 1. One advantage of increasing the radial distance is that two magnetic elements with opposite magnetization directions can be moved away from each other much more easily in the horizontal than in the vertical direction.

[0058] In this embodiment, the sealing body 22 has a tapered lower tip for sealing the bore 51. As in the Fig. 3In the embodiment shown, a return spring 40 is also provided here, which in principle can also be omitted. The first magnetic element 21 is designed as a ferromagnet in the present case, but can also be designed as a permanent magnet, as in the Fig. 5 shown fourth embodiment.

[0059] Fig. 6shows a schematic representation of a fifth embodiment of the shut-off valve 1 according to the invention with a rotatable trigger 30, which can be rotated in the direction of rotation indicated by the arrow 130. In this embodiment, a ferromagnetic magnetic element 31 is arranged in the trigger holder 32 of the trigger 30. In the second state of the trigger 30 shown here, the second magnetic element 31 is arranged as close as possible to the first magnetic element 21 of the actuator 20, so that an increased second magnetic force acts between the magnetic elements 21, 31. This brings the actuator 20 into the second position shown, whereby the bore 51 of the bore cover 50 and thus the first opening 11 are exposed, a flow of the working medium is possible, and the shut-off valve 1 is opened.

[0060] This embodiment thus offers the possibility of switching from the second to the first state by rotating the trigger 30. This brings the second magnetic element 32 into a position rotated by 90°, i.e., parallel to the cover surface 15 of the housing 10, whereby a reduced magnetic force acts between the magnetic elements 21, 31. The actuator 20 is then pressed towards the bore 51 by the restoring force of the return spring 40 (if present), the position-dependent weight force, and the hydraulic contact force of the inflowing working medium and brought into the first position, in which it forms a sealing seat with the bore cover 50 and closes the bore 51. The first opening 11 is thereby blocked, and the shut-off valve 1 is closed.

[0061] Fig. 7shows a schematic representation of a cross section through a sixth embodiment of the shut-off valve 1 according to the invention with a rotatable trigger 30. Unlike in the Fig. 6 In the embodiment shown, the second magnetic element 31 is also designed as a permanent magnet. To open the valve, the trigger 30 is rotated into the position shown, in which opposing magnetic poles of the two magnetic elements 21, 31 are opposite each other. To close the valve, the trigger 30 is rotated, preferably by an angle in the range of 90° to 270°, for example by 90° or 180°, so that (at 180°), for example, the same magnetic poles of the two magnetic elements 21, 31 are opposite each other, whereby the actuator 20 is additionally pressed in the direction of the bore cover 50. A return spring 40 can be omitted in this embodiment, but can also be provided additionally.

[0062] Fig. 8shows a schematic representation of a cross section through a seventh embodiment of the shut-off valve 1 according to the invention with a rotatable trigger 30, which can be rotated in the direction of rotation indicated by the arrow 130. In the trigger holder 32 of the trigger 30, unlike in the Fig. 7 In the embodiment shown, two magnetic elements 31, 33 in the form of permanent magnets with different magnetization directions are arranged. In the second state of the trigger 30 shown here, the second magnetic element 31 is arranged opposite the first magnetic element 21 of the actuator 20, so that the opposing magnetic poles face each other and an increased second magnetic force acts between the magnetic elements 21, 31. This moves the actuator 20 into the second position shown, whereby the bore 51 of the bore cover 50 and thus the first opening 11 is released and the shut-off valve 1 is opened.

[0063] To close the valve, the trigger 30 is rotated, preferably by 90° counterclockwise, so that the same magnetic poles of the two magnetic elements 21, 33 are opposite each other, whereby the actuator 20 is additionally pressed towards the bore cover 50. The first opening 11 is thereby blocked and the shut-off valve 1 is closed. A return spring 40 can be omitted in this embodiment, but can also be provided additionally. The embodiments of Fig. 6-8 thus offer the possibility of switching between the two states by rotating the trigger 30.

[0064] Fig. 9shows a schematic representation of a cross section through a check valve system 3 according to the invention, with the check valve 1 according to the invention, which serves as a control valve, and a working valve 2. The working valve 2 has a working valve receptacle 60, a working valve actuator 70, and a stationary body 90, which are integrated into the working valve receptacle 60. The working valve receptacle 60 is provided in an installation space 109, which is preferably designed as a blind hole. The installation space 109 or the working valve receptacle 60 are, in the case of use of the check valve system 3 in a door closer 300, integrated into the housing of the door closer 300 (see Fig. 13). The working valve receptacle 60 has a working valve inlet 61, a first working valve outlet 62, and a second working valve outlet 63. The working valve inlet 61 is connected to a working medium supply 106. The first working valve outlet 62 is connected to a first working medium outlet 107, and the second working valve outlet 63 is connected to a second working medium outlet 102, which simultaneously represents the working medium supply 102 of the shut-off valve 1. The first working medium outlet 107 and the working medium outlet 101 jointly open into a working medium outlet 108.

[0065] The working valve actuator 70 is arranged in the working valve receptacle 60 and has a through-bore 71 along its longitudinal axis, which is connected to the working valve inlet 61 when the working valve 2 is closed. This through-bore 71 establishes a connection between the working valve inlet 61 and the second working valve outlet 63. Furthermore, a working valve spring 80 is arranged within a working valve spring chamber 81 of the working valve receptacle 60. The working valve spring 80 exerts a spring force on the working valve actuator 70 in the direction of the working valve inlet 61. The first housing seal 67 seals the housing 60 against the working medium supply 106 and the first working medium discharge 107, and the second housing seal 68 seals it against the installation space 109. Another housing seal 69 serves as a sealing seat for the working valve actuator 70 around the working valve inlet 61.

[0066] The trigger 30 of the shut-off valve 1 is in the first state, ie the shut-off valve 1 is closed, since no or a reduced first magnetic force acts between the magnetic elements 21, 31.

[0067] The closed shut-off valve 1 blocks flow through the bypass bore 51. When the blocking process is initiated, working medium still flows through the connection 107. The resulting pressure difference enables the return spring 80 to push the working valve actuator 70 into the sealing seat. The pressure below and above the working valve actuator 70 is identical. The spring force (small force) and the pressure force dependent on the cross-sectional areas (several times greater above the working valve actuator 70 than below the working valve actuator 70) guarantee a seal between the working valve inlet 61 and the connection 107. A pressure- and, above all, an area-dependent actuating / sealing force is generated by the working medium.

[0068] When the shut-off valve 1 opens, a pressure difference arises between the dynamic pressure above and below the working valve actuator 70, the return spring 80 is compressed, the working valve 2 opens the working valve inlet 61 and the working medium can flow through the connection 107.

[0069] Fig. 10 shows a schematic representation of a cross section through the Fig. 9 The shut-off valve system 3 shown is in the open state. The trigger 30 of the shut-off valve 1 is now in the second state, so that an increased second magnetic force acts between the magnetic elements 21, 31, whereby the actuator 20 is brought into the second position and the shut-off valve 1 is opened.

[0070] The built-up pressure exerted by the working medium on the working valve actuator 70 in the direction of the working valve inlet 61 can escape through the open shut-off valve 1. In particular, the medium / fluid can flow through the open shut-off valve, causing a pressure drop and thus a reduction in the pressure-related component of the sealing force. Since the sealing force is smaller than the dynamic pressure force, the working valve opens. The working medium flowing through the working valve inlet 61 exerts a flow force on the working valve actuator 70 in the direction of the working valve spring 80, which is greater than the spring force in the opposite direction. The thin channel 71 in the piston is much thinner than the inlet 61. This causes a throttling effect and thus a dynamic pressure build-up, which leads to an opening force due to the pressure difference.This moves the working valve actuator 70 into a position in which it releases the working valve inlet 61 and the working medium can flow from the working valve inlet 61 to the first working valve outlet 62. The working valve 2 is thus open.

[0071] When the check valve 1 and the working valve 2 are closed, a pressure-dependent actuating force is present in the working valve 2, which presses the working valve actuator 70 into the sealing seat. Hydraulic pressure is present in the working valve inlet 61 and can build up in the spring chamber of the working valve, as this is connected to the second working valve outlet 63 via the through-bore 71 in the working valve actuator 70. When the check valve 1 is closed and the working valve 2 is open (fluid flows from the inlet past the working valve actuator 70 of the working valve to the outlet), a negative pressure is therefore present below the working valve actuator 70. Supported by the spring force, the working valve actuator 70 is lowered until it blocks. When the check valve 1 is open, the pressure in the working valve spring chamber 81 is reduced by the fluid flowing out (through the check valve 1).The now higher pressure below the working valve actuator 70 causes a pressure-dependent force on the working valve actuator 70, thus lifting it against the spring force. The decisive factor is the ratio of the relevant cross-sectional areas over which the respective applied pressure causes actuating / blocking forces.

[0072] With such a check valve system 3, the application possibilities of a check valve 1 can be expanded. High applied pressures in the check valve system require a significant reduction in the outlet bore diameter of the outlet 11 of the check valve 1, so that only a low flow rate is possible. If a high flow rate is required, the system pressure should be very low in the variants described above. This problem is solved with the proposed check valve system.

[0073] Thanks to comparatively low control forces (relative to the working pressure to be regulated), the desired function can be implemented at high applied pressures and also enables the control of high volume flows. In principle, the shut-off valve system can be considered to be divided into two parts. A control valve, preferably in the form of the shut-off valve 1 according to the invention described above, is connected to the second part, the working valve 2, via an additional connection (102). Fundamentally, this reduces the requirement to a practical size in the control valve, but still allows larger volume flows or pressures to be reliably controlled via the working valve 2. The second magnetic element 31 in the control valve can preferably be designed as a permanent magnet (as shown) or from ferromagnetic material (e.g., as an iron core).

[0074] As described above, activation (control valve blocks) occurs by weakening / removing the attractive force of the two magnetic elements 21, 31 by increasing the distance. The main piston 70 in the working valve 2 is controlled by opening and closing the bypass bore 51 (very small bore diameter in the bore cover 50 of the shut-off valve 1). When the control valve is closed, the hydraulics flow through the working piston towards the return spring 80 in the working valve 2 and thus leads to independent pressure-dependent blocking (through pressure build-up, i.e., pressure is the same above and below, the difference in area causes a force difference that lowers the working piston). When the control valve is open, the pressure in the spring chamber 81 is reduced, so that the working piston 70 rises and the majority of the hydraulic fluid can flow out via the outlet 62 (large bore) and the connection 107.

[0075] The hermetic separation of the working space and the surrounding environment can be implemented reliably, with low complexity, and at reduced cost thanks to static sealing points. These sealing components of the valves (plugs, covers, etc.) can be screwed in, pressed in, glued, fixed (with a locking element or stamping), or welded.

[0076] The manufacturing requirements for the individual components are relatively low. Sealing seats can be manufactured as a hard sealing seat (e.g., a ball seated in a bore) with a form-fitting design, or they can be simplified by purchasing parts, for example, inexpensive O-rings (available in all designs; dimension, hardness, material, or quality). Magnet sizes up to a cylindrical diameter of 6 x H6 (bar magnets) can be implemented without any problems. Such a magnet pairing offers, with a system-standard switching distance of a maximum of 1.5 mm between the magnets, a more than sufficient attractive force of up to an average of 5.4 N. The thickness of the partition material and the travel range can theoretically be further reduced, for example, by using more stable materials or increasing the attractive forces of the magnetic elements.

[0077] The check valve 1 according to the invention can be used in various applications, for example, in a door closer 200 for controlling the closing movement, preferably for implementing a closing sequence control for double-leaf doors or for door closers in other closing situations. The installation space limited by the housing of a door closer (referred to here as "closer housing 201") is sufficient to implement the individual components of the shown check valve variants in a space-saving manner. The closer housing 201 is supplemented by various bores and simultaneously serves as a valve housing. The non-ferromagnetic material of the closer housing 201 is advantageous in this regard.

[0078] Fig. 11shows a schematic representation of a cross-section through the door closer 200 with the closer housing 201 as well as with the check valve 1, a closer piston 203 and a line system 204, which are arranged in the closer housing 201. The check valve 1 is shown here in the open state. The driver 202 is operatively connected to the trigger 30 of the check valve 1 on the outside of the closer housing 201 and can move it from the first to the second state and vice versa depending on the signal. In this embodiment, both the first magnetic element 21 of the actuator 20 and the second magnetic element 31 of the trigger 30 are each designed as a ring magnet. In principle, the two magnetic elements 21, 31 can also have other geometries. Likewise, the geometry of the first magnetic element 21 can differ from the geometry of the second magnetic element 31.

[0079] The closer piston 203 in the door closer 200, 300 is moved toward the closer spring 206 or backwards, analogous to the door movement. The closer housing 201 is filled with working fluid. During the opening process, working fluid flows from the spring chamber through the closer piston 203 (thanks to a check valve located therein that opens, not shown here) in front of the closer piston 203. During the closing process, the check valve blocks, so that no working fluid flows through the closer piston 203 and must therefore be forcibly discharged through the hydraulic line 204. If the check valve 1 is opened as shown, the working fluid can flow back to the closer piston 203, and the door leaf can be closed.

[0080] Fig. 12 shows a schematic representation of a cross section of the Fig. 11The door closer 200 shown with the shut-off valve 1 in the closed state. The working fluid cannot flow out of the cavity 205 in front of the closing piston 203, blocking the closing piston 203 and preventing it from returning to its initial position, which is necessary for closing the door. When the shut-off valve 1 is closed, the working fluid cannot flow back into the spring chamber or behind the piston seal arranged around the closing piston 203. A closing movement of the door leaf cannot be performed.

[0081] Fig. 13shows an enlarged schematic representation of a cross section through a second embodiment of the door closer 300 with a shut-off valve system 3 with the shut-off valve 1 according to the invention and the working valve 2 in the open state. Here, the line system 204 has the working medium supply 106, the first working medium discharge 107 and the second working medium discharge 102. When the shut-off valve 1 and thus also the working valve 2 are open, the closing piston 203 can assume its initial position. In contrast to the door closer 200 in Fig. 11 and 12The outflow of the working medium into the space around the closing piston 203 is not achieved via a direct line (204), but rather an interposed working valve. In this embodiment, the working medium is directed from the cavity 205 into the space around the closing piston 203 by releasing the first working medium discharge 107 through the contraction of the working valve spring 80 and the lifting of the working valve actuator 70 from the sealing seat of the working medium supply 106.

[0082] Fig. 14 shows a schematic representation of a moving leaf unit 500 with the door closer 200 according to the invention, with the check valve 1 and a Bowden cable 501, wherein the Bowden cable 501 is connected directly via the driver 202 to the trigger 30 of the check valve 1 (here, for example, placed on the front face of the door closer). When opening the fixed leaf 610 (see Fig. 15), the Bowden cable 501 is moved in the direction of arrow 510 and, consequently, the trigger 30 is moved in the direction of arrow 520, closing the shut-off valve 1. The shut-off valve 1 is thus activated or deactivated by a directly connected Bowden cable. This has the advantage that the use of the shut-off valve 1 requires much lower valve actuating forces, ensures absolute tightness, prevents leaks, and significantly reduces costs.

[0083] Fig. 15 shows a schematic representation of a top view of an open double-leaf door 600 with a closing sequence control. The double-leaf door 600 has a fixed leaf 610 with a follower flap 611 and a fixed leaf unit 601, a moving leaf 620 with a moving leaf unit 500 with the door closer 200 according to the invention.

[0084] When the passive leaf 610 is opened, the active leaf 620 is also opened via the follower flap 611. At the same time, a signal, usually via a cable pull, is transmitted to the active leaf unit 500 with the door closer 200. As shown in Fig. 14 As shown, this actuates the actuator of the locking valve 1 and closes the valve. Blocking the hydraulic flow blocks the movement of the piston 203 in the closing direction, thereby preventing the active leaf 620 from closing until the inactive leaf 610 is sufficiently closed. This ensures that the double-leaf door closes in the correct sequence.

[0085] According to the invention, a door closer with a magnetically controlled shut-off valve is proposed, which can be switched to the two shut-off valve states at will, preferably via an actuator movement initiated by the closer lever. The shut-off valve is preferably mounted in the closer housing in a space-saving manner.

[0086] Thanks to the described check valve 1, a reliable closing sequence control can be generated that is capable of meeting demanding requirements, such as high door leaf weights and a large distance between the hinge and the opposite door leaf surface when mounted on the opposite hinge side. No other known system can control these requirements as reliably and simply, in terms of the actuating force required. This distinguishes check valve 1 in a particularly noteworthy way.

[0087] The exemplary variants shown can also be realized with identical functions using a wide variety of alternative components and designs.

[0088] The check valve and the check valve system according to the invention represent simple and cost-effective solutions that can be used in a wide variety of applications. In particular, the check valve according to the invention reliably assumes a blocking position in a neutral, unaffected state. The check valve according to the invention can advantageously be used in a door closer. List of reference symbols 1 shut-off valve 90 Stand body 2 Working valve 101 Working medium removal 3 shut-off valve system 102 Working medium supply 10 Housing 103 Upper system limit 11 First opening 104 Vicinity 12 Second opening 105 Lower system limit 13 Floor area 106 Working medium supply 14 lateral surface 107 second working medium discharge 15 Cover area 108 Working medium removal 16 cavity 109 Installation space 17 recess 110 Arrow direction 1 18 Housing sealing ring 120 Arrow direction 2 19 sealing ring 130 Arrow direction 3 20 actuator 200 door closer 21 First magnetic element 201 closer housing 22 Sealing body 202 Driver 30 trigger 203 closing piston 31 Second magnetic element 204 piping system 32 Shutter release holder 205 cavity 33 Third magnetic element 206 closing spring 40 Return spring 210 Arrow 50 bore cover 300 door closer 51 drilling 500 Active leaf unit 60 Working valve holder 501 Bowden cable 61 Working valve inlet 510 Arrow 62 First working valve outlet 520 Arrow 63 Second working valve outlet 600 Double-leaf door 67 Housing seal 601 Passive leaf unit 68 Housing seal 610 passive wing 69 Housing seal 611 Carrier flap 70 Working valve actuator 620 aisle leaf 71 Through hole 80 Working valve spring 81 Working valve spring chamber

Claims

1. A door closer (200, 300) with a driver (202) and a check valve (1), wherein the check valve comprises: - a housing (10) with at least two openings (11, 12) through which a working medium can flow through the check valve (1), - an actuator (20) which is integrated into the housing (10), with a sealing body (22) which can form a sealing seat with the housing (10) around a first opening (11) of the at least two openings (11, 12), and with a first magnetic element (21), and - a trigger (30) which is arranged outside the housing (10) and hermetically separated from the actuator (20), has a second magnetic element (31) and can assume at least two states, wherein at least one of the magnetic elements (21, 31) has a permanent magnet and the other magnetic element (21, 31) has a permanent magnet or a ferromagnet has,wherein, in a first state of the trigger (30), no magnetic force or a first magnetic force acts between the magnetic elements (21, 31), and the actuator (20) is automatically in a first position in which it blocks the first opening (11) and forms a sealing seat with the housing (10) around this opening (11); wherein, in a second state of the trigger (30), a second magnetic force acts between the magnetic elements (21, 31), by which the actuator (20) is brought into a second position in which it is lifted from the sealing seat and releases the first opening (11); wherein, when the trigger (30) is brought from the second state to the first state, the actuator (20) automatically returns to the first position, even if no magnetic force acts between the magnetic elements (21, 31); and wherein the driver (202) is operatively connected to the trigger (30) of the shut-off valve (1) in order to bring it into the first or second state.

2. Door closer (200, 300) according to claim 1, wherein the first opening (11) of the check valve (1) is arranged in a bottom surface (13) of the housing (10) opposite the trigger (30) and a second opening (12) of the at least two openings (11, 12) is arranged in a circumferential surface (14) of the housing (10).

3. Door closer (200, 300) according to one of the preceding claims, wherein the check valve (1) further comprises a return spring (40) arranged within the housing (10) and exerting a return force on the actuator (20) in the direction of the first opening (11).

4. Door closer (200, 300) according to one of the preceding claims, wherein the first opening (11) of the shut-off valve (1) is designed as an outlet for the working medium for connection to a working medium discharge (101) and a second opening (12) of the at least two openings (11, 12) is designed as an inlet for the working medium for connection to a working medium supply (102).

5. Door closer (200, 300) according to claim 4, wherein the actuator (20) and the second opening (12) of the shut-off valve (1) are designed such that the working medium flowing in through the second opening (12) exerts a force on the actuator (20) in the direction of the first opening (11).

6. Door closer (200, 300) according to claim 4, wherein the actuator (20) and the second opening (12) of the shut-off valve (1) are designed such that the second opening (12) is open in both the first position and the second position of the actuator (20).

7. Door closer (200, 300) according to one of the preceding claims, wherein the housing (10) of the shut-off valve (1) has a recess (17) in a cover surface (15) opposite the first opening (11), into which recess the trigger (30) can be inserted into the second state.

8. Door closer (200, 300) according to one of the preceding claims, wherein the trigger (30) of the check valve (1) is designed to switch back and forth between the first and the second state by displacement in a plane transverse to the longitudinal axis of the check valve (1) and / or by displacement in the direction of the longitudinal axis and / or by rotation about an axis perpendicular to the longitudinal axis.

9. Door closer (200, 300) according to one of the preceding claims, wherein the first magnetic element (21) and the second magnetic element (31) of the check valve (1) are permanent magnets arranged such that opposite magnetic poles face each other.

10. Door closer (200, 300) according to one of the preceding claims, wherein two magnetic elements (31, 33) in the form of permanent magnets with opposite magnetization directions are arranged in the trigger (30) of the shut-off valve (1), wherein in each of the two states of the trigger (30) one of the permanent magnets is arranged opposite the first magnetic element (21) of the actuator (20).

11. Door closer (300) according to one of the preceding claims with a check valve system (3) with: - the check valve (1), which serves as a control valve and - a working valve (2) with a working valve receptacle (60) and a working valve actuator (70) which is arranged in the working valve receptacle (60), wherein the working valve receptacle (60) has a working valve inlet (61), a first working valve outlet (62) and a second working valve outlet (63), wherein the second working valve outlet (63) is connected to a second opening (12) of the at least two openings (11, 12) of the check valve (1).

12. The door closer (300) according to claim 11, further comprising a working valve spring (80) disposed within the working valve housing (60) and exerting a spring force on the working valve actuator (70) in the direction of the working valve inlet (61) and bringing the working valve actuator (70) into a position in which it closes the working valve inlet (61).

13. Door closer (300) according to claim 11 or 12, wherein the working valve actuator (70) has a through-bore (71) along its longitudinal axis, which establishes a connection between the working valve inlet (61) and the second working valve outlet (63).

14. A check valve (1), comprising - a housing (10) with at least two openings (11, 12) through which a working medium can flow through the check valve (1), - an actuator (20) which is integrated into the housing (10), with a sealing body (22) which can form a sealing seat with the housing (10) around a first opening (11) of the at least two openings (11, 12), and with a first magnetic element (21), and - a trigger (30) which is arranged outside the housing (10) and hermetically separated from the actuator (20), has a second magnetic element (31) and can assume at least two states, wherein at least one of the magnetic elements (21, 31) has a permanent magnet and the other magnetic element (21, 31) has a permanent magnet or a ferromagnet, wherein in a first state of the trigger (30) there is no magnetic force or a first magnetic force between the magnetic elements (21,31) and the actuator (20) is automatically in a first position in which it blocks the first opening (11) and forms a sealing seat with the housing (10) around the first opening (11), wherein in a second state of the trigger (30) a second magnetic force acts between the magnetic elements (21, 31), by means of which the actuator (20) is brought into a second position in which it is lifted from the sealing seat and releases the first opening (11), and wherein the actuator (20) automatically returns to the first position when the trigger (30) is brought from the second state to the first state, even if no magnetic force acts between the magnetic elements (21, 31).

15. Shut-off valve system (3) with: - a shut-off valve (1) according to claim 14, which serves as a control valve and - a working valve (2) with a working valve housing (60) and a working valve actuator (70) which is integrated into the working valve housing (60), wherein the working valve housing (60) has a working valve inlet (61), a first working valve outlet (62) and a second working valve outlet (63), wherein the second working valve outlet (63) is connected to the second opening (12) of the shut-off valve (1).

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