Filter head and filter device
The filter head with a valve assembly addresses the issues of leakage and stagnation by adapting flow paths to different cartridges, ensuring reliable and hygienic water treatment.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- GROHE AG
- Filing Date
- 2025-12-15
- Publication Date
- 2026-06-25
AI Technical Summary
Existing filter heads face challenges in accommodating different filter cartridges, leading to water leakage during cartridge changes and stagnation of water downstream, which complicates design standardization and increases bacterial growth risks.
A filter head with a valve assembly comprising a movable valve sleeve and pin, forming switchable sealing surfaces, allows for flexible connection and separation of flow paths, preventing leakage and stagnation by adjusting flow channels based on the attached cartridge.
The solution ensures secure water supply without leakage during cartridge changes and prevents water stagnation, maintaining hygiene by allowing continuous flow through the system even when cartridges are not connected, thus enhancing the reliability and hygiene of water treatment systems.
Smart Images
Figure EP2025087097_25062026_PF_FP_ABST
Abstract
Description
[0001] Grohe AG 15.12.2025
[0002] Filter head and a filter device
[0003] The present invention relates to a filter head and a filter device comprising a filter cartridge and a filter head or the described filter head.
[0004] Such a filter device is typically installed upstream of a drinking water supply appliance. The drinking water supply appliance is, for example, a water dispenser or a sanitary fitting. The drinking water supply appliance may include, in particular, a container and / or pipes in which the water stagnates when the appliance is not in use.
[0005] There are various drinking water dispensers that connect to an existing drinking water supply. In particular, there are water dispensers that can dispense chilled, carbonated water. This eliminates the need for bottled carbonated water. Often, these dispensers also offer the option of dispensing only chilled or only unchilled water.
[0006] To treat tap water or drinking water, filter cartridges are known that are installed upstream of such a drinking water-carrying appliance. A filter head is provided on-site for such a filter cartridge; this head is installed in the existing (drinking) water pipe leading to the drinking water-carrying appliance.
[0007] A replaceable filter cartridge used for this purpose can, for example, contain an ion exchange material for softening the water and activated carbon for removing pollutants and bacteria. Grohe AG 15.12.2025
[0008] The filter cartridge is permeated by water and treats it, so that this drinking water is refined, e.g. for a water dispenser or for a machine for preparing hot drinks.
[0009] Filter devices that filter and soften tap water are widely known. The direction of water filtration varies depending on the manufacturing process or the type of filter. For example, cylindrical filter cartridges are available in two types: those that filter water from an outer annular channel to a centrally located channel, and those that filter water from the central channel to the annular channel. To facilitate easy replacement of the filter cartridge on a water supply line or appliance, a filter head, connected to the cartridge by a screw or bayonet fitting, may be located on the end of the water supply line or appliance. Furthermore, there is a risk of water leakage if the filter cartridge is removed while water pressure is present.Therefore, it is desirable to provide a water shut-off valve in the filter head that automatically closes the water channel when the filter cartridge is removed.
[0010] When using filter cartridges with different water filtration directions, the filter head must be designed to match the water inlet and outlet arrangement of each filter cartridge or the connected filter cartridge. This complicates the standardization of filter heads or their design. Furthermore, when using a filter cartridge to remove dissolved chlorine, there is a risk of bacterial growth if the water stagnates downstream of the filter cartridge for an extended period. Grohe AG 15.12.2025
[0011] The object of the invention is therefore to at least partially solve the problems described with reference to the prior art and, in particular, to provide a filter head that is suitable for use with different filter cartridges. Water leakage during cartridge changes should be avoided as far as possible. Furthermore, water should not stagnate downstream of the filter cartridge for extended periods.
[0012] These problems are solved with a filter head according to the features of independent claim 1. Further advantageous embodiments of the invention are specified in the dependent claims. It should be noted that the features listed individually in the dependent claims can be combined with one another in any technologically meaningful way and define further embodiments of the invention. In addition, the features specified in the claims are further specified and explained in the description, which also presents further preferred embodiments of the invention.
[0013] A filter head is proposed, at least comprehensively.
[0014] • a housing part with: o a first connection geometry for connection to a filter cartridge; o a first connection for a liquid; and o a second connection for the liquid;
[0015] • a connecting part attached to the housing part,
[0016] • a valve assembly with o a valve sleeve which is movable relative to the housing part and the connecting part along an axial direction and forms at least Grohe AG 15.12.2025 switchable sealing surfaces with the housing part and the connecting part; and o a valve pin arranged in the valve sleeve which is movable relative to the valve sleeve along the axial direction.
[0017] The valve sleeve has at least one first sealing surface that interacts switchably with the housing part, and a second sealing surface that interacts switchably with the connecting part. The valve pin has a third sealing surface that interacts switchably with the valve sleeve.
[0018] In a first position of the valve device, a flow-related connection is established between the connections and a volume of a filter cartridge that can be connected to the filter head, and in a second position of the valve device, this connection is interrupted.
[0019] The filter head serves primarily as a connecting element between a water supply line and a water supply appliance. The filter head is connected via one of its (first) connections to, for example, a water supply line through which drinking water is supplied. The water then passes through a filter cartridge in the filter head and subsequently, via a water outlet line connected to the other (second) connection on the filter head, to the water supply appliance. The filter cartridge then treats the water.
[0020] The water supply unit includes, in particular, an outlet for water or other liquid. The liquid can be dispensed via the outlet and / or filled into a drinking vessel, such as a bottle, glass, or cup. Grohe AG 15.12.2025
[0021] The filter head comprises a housing part with a (generally known) first connection geometry for connection to a filter cartridge. This can have a second connection geometry for connection to the first connection geometry. The connection geometries can be designed, in particular, as a threaded connection or a bayonet connection.
[0022] The liquid can be either fed into or discharged from the filter head via the first connection. The same applies in reverse to the second connection.
[0023] The connecting part is attached to the housing part, in particular detachably. Specifically, the valve device is captive within the filter head due to the connecting part and the housing part.
[0024] The valve assembly comprises, in particular, a valve sleeve and a valve pin. The valve pin extends at least partially through the valve sleeve. The valve pin is displaceable relative to the valve sleeve along the axial direction. The valve pin and valve sleeve are also displaceable relative to the housing part and the connecting part along the axial direction. The valve pin and valve sleeve serve, in particular, to create different flow connections between the ports and a volume of a filter cartridge and to provide flow separation between these connections.
[0025] In the first position of the valve assembly, a flow connection is established between the ports and the volume of a filter cartridge that can be connected to the filter head. This means that a liquid can flow into the filter head via one of the ports and is then introduced into the volume of a filter cartridge connected to the filter head. After passing through the Grohe AG 15.12.2025
[0026] The liquid re-enters the filter head via the volume and is then discharged from the filter head via the other connection.
[0027] In the second position of the valve assembly, the flow connection between the ports and the volume of the filter cartridge is severed. In particular, no liquid escapes from the filter head.
[0028] Specifically, the valve assembly is always in the first position when the filter head is connected to a filter cartridge. Specifically, the valve assembly is always in the second position when no filter cartridge is attached to the filter head. In this case, the valve assembly can be operated manually, for example. Specifically, the valve assembly is always in the first position when the filter head is connected to the filter cartridge.
[0029] A sealing surface, in particular, describes a linear or planar surface that, in conjunction with another surface, forms a liquid-tight seal. Sealing surfaces are typically formed by O-rings or sealing rings, which can create a seal with opposing surfaces. The first and second sealing surfaces can each be formed by an O-ring (or sealing ring) or by a single molded seal. In the latter case, the single molded seal is used instead of two O-rings.
[0030] In particular, the first sealing surface (between the valve sleeve and the housing part), the second sealing surface (between the valve sleeve and the connecting part), and the third sealing surface (between the valve pin and the valve sleeve) are switchable, meaning that it is possible to switch between a sealed and an unsealed state. This also applies to a fourth sealing surface. Grohe AG 15.12.2025
[0031] (between the connecting part and the filter cartridge) and a fifth sealing surface (between the valve sleeve and the filter cartridge). A sixth sealing surface (e.g., between the connecting part and the housing part) is specifically designed to be non-switchable (because these parts are only connected once during the manufacturing of the filter head).
[0032] In particular, in the second position the first connection is fluidly connected to the second connection, and both connections are fluidly separated from the environment of the filter head.
[0033] In particular, this allows the liquid to continue passing through the filter head without circulating through the entire volume of the filter cartridge. Specifically, this makes it possible for liquid to pass through the filter head even when the filter cartridge is not connected, thus preventing stagnation downstream of the filter head.
[0034] This facilitates the maintenance of hygiene in downstream water systems in areas where, for example, tap water is disinfected with chlorine.
[0035] In particular, in the first position, the valve assembly forms a first flow channel and a second flow channel between the connections and the filter cartridge. The first flow channel is located between the valve pin and an inner circumferential surface of the valve sleeve, and the second flow channel is located between the connecting part and an outer circumferential surface of the valve sleeve. Grohe AG 15.12.2025
[0036] In particular, in the first position, the first connection is connected to the first flow channel and the second connection is connected to the second flow channel.
[0037] In particular, the flow channels can be traversed in any direction, i.e., from the filter cartridge to the connection or from the connection to the filter cartridge. Specifically, the flow of liquid can thus be determined depending on the filter cartridge used.
[0038] In particular, the direction of flow of the liquid through the filter head can be switched and reversed.
[0039] In particular, the liquid can be fed into the filter head via the first connection and discharged from the filter head via the second connection, or vice versa, fed into the filter head via the second connection and discharged from the filter head via the first connection.
[0040] In particular, this functionality of the filter head can be achieved by connecting an inlet and an outlet to their respective ports. Specifically, an inlet for the liquid can be connected to the first port, so that the liquid is fed to the filter head via this port. Similarly, an outlet can be connected to the second port, so that the liquid is discharged from the filter head and into the outlet via this port.
[0041] In its simplest form, the supply and return lines can be swapped, so that the supply line is removed from the first connection and connected to the second. Accordingly, Grohe AG will [date] 15.12.2025
[0042] The line was removed from the second terminal and connected to the first terminal.
[0043] In an alternative design, a switch can be provided which can switch the supply line to the first terminal or to the second terminal and simultaneously connect the output line to the second terminal or to the first terminal.
[0044] The switch can be provided as a separate component that is connected to the filter head via the supply line or return line, or via the terminals.
[0045] Alternatively, the switch can be located inside the filter head, so that the first connection can be switched to the first flow channel (first switch position) or to the second flow channel (second switch position), and correspondingly the second connection can be connected to the second flow channel (first switch position) or to the first flow channel. In particular, the switching can be carried out by a user via a control element located on the filter head.
[0046] In particular, the valve pin is supported on the housing part via an energy storage element (in particular a spring, preferably a coil spring, especially preferably a compression spring) and can be moved from the first position to the second position by the energy storage element.
[0047] In particular, the energy storage element is elastically deformed when the filter head is attached to a filter cartridge (i.e., when the valve sleeve and valve pin move along the axial direction, from the second position to the first position). The energy stored in the energy storage element can then be released when the filter cartridge is removed, thereby moving the valve device back to the second position.
[0048] A further filter device is proposed, comprising at least the described filter head and a filter cartridge with a volume (through which the liquid flows), wherein the filter cartridge has a second connection geometry via which it can be connected to the first connection geometry to form the filter device. In a first position of the valve assembly, the first connection is fluidically connected to the second connection via the volume, and in a second position of the valve assembly, the connections are fluidically directly connected to each other and thereby fluidically separated from the volume and the surroundings of the filter head.
[0049] In particular, to create a connection between the filter head and the filter cartridge, the valve sleeve and thus also the valve pin can be moved from a second position of the valve device into the housing part and thus into the first position by contact with the filter cartridge.
[0050] In particular, when creating a connection between the filter head and the filter cartridge, the volume is first separated from the environment by the filter head in terms of flow technology, and (only) afterwards a flow-technical connection is created between the connections and the volume.
[0051] This prevents liquid from leaking from the filter head. Grohe AG 15.12.2025
[0052] In particular, the volume can be fluidically separated from the environment by a fourth sealing surface located on the connecting part or on the filter cartridge.
[0053] In particular, the filter cartridge has a central channel opening and an annular channel opening extending around the central channel opening, through which the volume is connected to the connections in the first position. In the first position, the channel openings are only fluidically connected to each other via the volume, and the central channel opening is fluidically separated from the annular channel opening by a fifth sealing surface located on the valve sleeve or on the filter cartridge.
[0054] A first channel extends from the central channel opening into the filter cartridge. A second channel extends from the annular channel opening into the filter cartridge. The channel openings and the channels themselves determine the flow direction and sequence within the volume of the filter cartridge.
[0055] In particular, the filter head or filter device has a bypass through which, only when the valve device is in the first position, a first partial quantity (a volume flow) of the liquid is directed or can be directed from one connection (e.g. the first connection) to the other connection (e.g. the second connection), whereby the first partial quantity only flows through a part of the volume of the filter cartridge.
[0056] The filter cartridge has a volume through which the liquid can flow. The bypass divides the amount of liquid (or flow rate) flowing through the filter head, specifically into a first sub-volume and a second sub-volume. The first sub-volume is routed through the bypass and flows through only a portion of the filter cartridge's volume, e.g., at most 20% or at most 10% of the cartridge's volume. The second sub-volume flows through the entire volume of the filter cartridge.
[0057] In particular, this bypass is only functional in the first position of the valve assembly (bypass "functional"). This means, specifically, that in the first position of the valve assembly, where a flow connection is established between the ports and a volume of a filter cartridge connectable to the filter head, a first partial quantity of the liquid supplied to the filter head via the respective port is supplied to the other port, without this first partial quantity of liquid flowing through the entire volume of the filter cartridge (but only partially).
[0058] In particular, only a maximum of 50%, preferably only a maximum of 30%, and especially preferably only a maximum of 15% of the amount of liquid supplied to the filter head via the connection can be diverted (towards the other connection).
[0059] The second portion of the liquid, which does not pass through the bypass (i.e., at least 50%, in particular at least 70%, preferably at least 85% of the total liquid volume), flows through the entire volume of the filter cartridge and then re-enters the filter head. It is then discharged from the filter head via the other connection (together with the first portion of the liquid). The mixing of the first and second portions can occur downstream of the filter cartridge (i.e., in the filter head) or still within the filter cartridge. Grohe AG 15.12.2025
[0060] In particular, the filter cartridge comprises a (larger) first section filled with a filter substrate and a (smaller) second section filled with a filter layer (e.g., activated carbon or felt). Specifically, the first section flows only through the filter layer (the smaller second section), while the second section first flows through the filter substrate (i.e., the larger first section) and then through the filter layer.
[0061] Alternatively, the first subset is introduced into the first sub-area, but then in such a way that the first subset only flows through a small partial volume of the first sub-area.
[0062] In particular, the first sub-area and the second sub-area are separated from each other by a partition wall in which openings are provided.
[0063] In the second position of the valve assembly, the flow connection between the ports and the volume of the filter cartridge is severed. In particular, no liquid escapes from the filter head. Specifically, the filter head can be flowed through; thus, the first and second ports are flow-connected (but not via the bypass).
[0064] In particular, in the second position the bypass is closed (bypass "out of order"), so that no fluid can flow from one port via the bypass to the other port.
[0065] In particular, the bypass is switchable, meaning its function can be activated or deactivated. Grohe AG 15.12.2025
[0066] In particular, the flow rate of a first subset of the flow (and thus also the second subset) routed via the bypass can be adjusted by changing the cross-sectional area of the bypass. Specifically, the (narrowest) cross-sectional area of the bypass can be changed, thereby allowing the flow rate of the first subset to be set. In particular, the flow rate of the first subset can thus be adjusted in stages. Specifically, the valve sleeve and valve pin are rotated relative to the cartridge, so that opposing flow openings in the valve sleeve and in the cartridge form different cross-sectional areas.
[0067] The statements regarding the filter head apply equally to the filter device and vice versa.
[0068] The use of indefinite articles (“a”, “an”, “one”, and “one”), particularly in the patent claims and the description reproducing them, is to be understood as such and not as a numeral. Accordingly, terms or components introduced by these articles are to be understood as occurring at least once and, in particular, may also occur multiple times.
[0069] It should be noted as a precaution that the numerical terms used here ("first", "second", etc.) primarily serve (only) to distinguish between several similar objects, quantities, or processes, and thus do not necessarily dictate any dependency and / or sequence between these objects, quantities, or processes. Should a dependency and / or sequence be required, this is explicitly stated here or will be obvious to a person skilled in the art upon studying the specific design described. Insofar as a component can occur multiple times ("at least one"), the description of one of these components may apply equally to all or some of the multiple components, but this is not mandatory.
[0070] The invention and its technical context are explained in more detail below with reference to the figure. It should be noted that the figure shows a particularly preferred embodiment of the invention, but that the invention is not limited to this embodiment. The figure shows:
[0071] Fig. 1: a first embodiment of a filter device in a side view;
[0072] Fig. 2: the filter cartridge of the filter device according to Fig. 1 with a second connection geometry in a perspective view;
[0073] Fig. 3: a first embodiment of a filter head of the filter device according to Fig. 1 in an exploded view, in perspective view;
[0074] Fig. 4: the filter device according to Fig. 1 in a perspective view in section; with the valve device in the first position;
[0075] Fig. 5: the filter device according to Fig. 4 in a perspective view in section; with the valve device in the second position;
[0076] Fig. 6: The filter head according to Fig. 3 in a top view in section; Grohe AG 15.12.2025
[0077] Fig. 7: the filter cartridge according to Fig. 2, with a first flow direction, in a side view in section;
[0078] Fig. 8: the filter device according to Fig. 1 in use with the filter cartridge according to Fig. 7;
[0079] Fig. 9: the filter device according to Fig. 8 with the filter device in the second position;
[0080] Fig. 10: the filter cartridge according to Fig. 2, with a second flow direction, in a side view in section;
[0081] Fig. 11: the filter device according to Fig. 1 in use with the filter cartridge according to Fig. 10;
[0082] Fig. 12: the filter device according to Fig. 11 with the filter device in the second position;
[0083] Fig. 13: a second embodiment of a filter head in use with the filter device according to Fig. 1, in the first position, in a perspective view in section;
[0084] Fig. 14: the filter device according to Fig. 13, in the second position, in a perspective view in section;
[0085] Fig. 15: Another filter head in a top-down section view; Grohe AG 15.12.2025
[0086] Fig. 16: a second embodiment of a filter device in a first side view in section;
[0087] Fig. 17: the filter device according to Fig. 16, located further back
[0088] Cut;
[0089] Fig. 18: the filter device according to Fig. 16, in a position rotated by 90 degrees, in a side view in section;
[0090] Fig. 19: the filter device in the view according to Fig. 17, with the switch in a first switching position;
[0091] Fig. 20: the filter device as seen in Figs. 17 and 19, with the
[0092] Switch in a second switching position;
[0093] Fig. 21: the filter device according to Fig. 20, with the switch in the second switching position, in a top view, in section XXI-XXI;
[0094] Fig. 22: the filter device according to Fig. 20, with the switch in the second switching position, in a top view, in section XXII-XXII;
[0095] Fig. 23: the filter device as seen in Fig. 18;
[0096] Fig. 24: the filter device in the view according to Fig. 19 in a section further forward, with the switch in the first switching position; Grohe AG 15.12.2025
[0097] Fig. 25: The filter device according to Figs. 16 to 24 in a perspective view
[0098] Opinion;
[0099] Fig. 26: the filter head of the filter device according to Fig. 25 in a perspective view;
[0100] Fig. 27: the cartridge of the filter device according to Fig. 25 in a top view;
[0101] Fig. 28: the filter head of the filter device according to Fig. 25 in a position for adjusting the bypass, in a side view in section;
[0102] Fig. 29: the filter head according to Fig. 26, with the valve assembly in the second
[0103] Position, in a side view in section; and
[0104] Fig. 30: the filter device according to Fig. 25, with the valve device in the first position; in a side view in section.
[0105] Fig. 1 shows a first embodiment of a filter device 25 in a side view. Fig. 2 shows the filter cartridge 4 of the filter device 25 according to Fig. 1 with a second connection geometry 26 in a perspective view. Figs. 1 and 2 are described together below.
[0106] The filter device 25 comprises a filter head 1 and a filter cartridge 4 with a volume 18, wherein the filter cartridge 4 has a second connection geometry 26 via which it can be connected to the first connection geometry 3 (see Figs. 4 and 5) to form the filter device 25. Grohe AG 15.12.2025
[0107] Fig. 3 shows a first embodiment of a filter head 1 of the filter device 25 according to Fig. 1 in an exploded view, in perspective. Fig. 4 shows the filter device 25 according to Fig. 1 in a perspective view in section IV-IV (see Fig. 6); with the valve assembly 8 in the first position. Fig. 5 shows the filter device 25 according to Fig. 4 in a perspective view in section (as in Fig. 4); with the valve assembly 8 in the second position. Fig. 6 shows the filter head 1 according to Fig. 3 in a top view in section V1-V1 (see Fig. 1). Fig. 7 shows the filter cartridge 4 according to Fig. 2, with a first flow direction, in a side view in section. Fig. 8 shows the filter device 25 according to Fig. 1 in use with the filter cartridge 4 according to Fig. 7, in section IV-IV (see Fig. 6). Fig. 9 shows the filter device 25 according to Fig. 8 with the filter device 25 in the second position, in section IV-IV (see Fig. 6). The Fig.Figures 3 to 9 are described together below. Reference is made to the explanations for Figures 1 and 2.
[0108] The filter head 1 comprises a housing part 2 with a first connection geometry 3 for connection to a filter cartridge 4, a first connection 5 for a liquid, and a second connection 6 for the liquid. The filter head 1 further comprises a connecting part 7 connected to the housing part 2, and a valve assembly 8.
[0109] The valve assembly 8 comprises a valve sleeve 9, which is movable relative to the housing part 2 and the connecting part 7 along an axial direction 10 and forms switchable sealing surfaces 11, 12, 13, 14, 15, 16 with the housing part 2, the connecting part 7, and the filter cartridge 4. The valve assembly 8 further comprises a valve pin 17 arranged in the valve sleeve 9 and movable relative to the valve sleeve 9 along the axial direction 10. The valve sleeve 9 has a first sealing surface 11, which switchably interacts with the housing part 2 (Grohe AG 15.12.2025), and a second sealing surface 12, which switchably interacts with the connecting part 7.
[0110] Furthermore, the valve sleeve 9 has a fifth sealing surface 15, which interacts switchably with the filter cartridge 4. The sealing surfaces 11, 12, 15 are each designed as O-rings, which are arranged on an outer circumferential surface of the valve sleeve 9 and each form a sealing seat with a corresponding opposing surface.
[0111] The valve pin 17 has a third sealing surface 13 which interacts with the valve sleeve 9. The sealing surface 13 is also designed as an O-ring, which is arranged on an outer circumferential surface of the valve pin 17 and forms a switchable sealing seat with a corresponding opposing surface on the valve sleeve 9.
[0112] In a first position of the valve assembly 8, a flow connection is established between the ports 5, 6 and a volume 18 of the filter cartridge 4 connected to the filter head 1 (Fig. 4), and in a second position of the valve assembly 8 this connection is interrupted (Fig. 5).
[0113] The filter head 1 serves as a connecting element between a water-carrying pipe (water supply line, connected, for example, to the second connection 6 in Fig. 8) and a water supply device (connected to the first connection 5 in Fig. 9). The filter head 1 is connected via one of the connections 5, 6, for example, to a water supply line through which, for example, drinking water is supplied. The water can then pass through a filter cartridge 4 via the filter head 1 and subsequently, via a water outlet line arranged on the filter head 1 and connected to the other connection 6, 5, to the Grohe AG 15.12.2025
[0114] The water is then routed to the water supply unit. The water can be treated using filter cartridge 4.
[0115] The filter head 1 comprises a housing part 2 with a first connection geometry 3 for connection to a filter cartridge 4. This cartridge has a second connection geometry 26 for connection to the first connection geometry 3. The connection geometries 3 and 26 are designed as bayonet fittings.
[0116] In Fig. 8, the liquid is fed to the filter head 1 via the second port 6 and discharged from the filter head 1 via the first port 5. A first valve 29 is arranged in the first port 5 and a second valve 30 in the second port 6. Each valve 29, 30 allows flow in only one direction.
[0117] The connecting part 7 is frictionally connected to the housing part 2 and can be detachably connected via screws, but can also be permanently connected to the housing part 2, for example, by an adhesive. A sixth sealing surface 16 (O-ring) is provided between the connecting part 7 and the housing part 2. This O-ring (sixth sealing surface 16) can also be omitted if the connecting part 7 and the housing part 2 are connected to each other, for example, by an adhesive or welded together. The valve assembly 8 is captive in the filter head 1 by the connecting part 7 and the housing part 2.
[0118] The valve assembly 8 comprises the valve sleeve 9 and the valve pin 17. The valve pin 17 extends at least partially through the valve sleeve 9. The valve pin 17 is displaceable relative to the valve sleeve 9 along the axial direction 10. The valve pin 17 and the valve sleeve 9 are displaceable relative to the housing part 2 and the connecting part 7 along the axial direction 10. The valve pin 17 (Grohe AG 15.12.2025) and the valve sleeve 9 serve to form different flow connections between the ports 5, 6 and the volume 18 of the filter cartridge 4 and to provide flow separation for these connections.
[0119] In the first position of the valve assembly 8 (Fig. 4), a flow connection is established between the ports 5, 6 and the volume 18 of the filter cartridge 4 connected to the filter head 1. This means that a liquid can flow into the filter head 1 via one of the ports 5, 6 and is then introduced into the volume 18 of the filter cartridge 4 connected to the filter head 1. After passing through the volume 18, the liquid re-enters the filter head 1 and is discharged from the filter head 1 via the other port 5, 6.
[0120] In the second position of the valve assembly 8 (Fig. 5), the flow connection between the ports 5, 6 and the volume 18 of the filter cartridge 4 is closed. No liquid escapes from the filter head 1.
[0121] The valve assembly 8 is always in the first position when the filter head 1 is connected to a filter cartridge 4, because the valve sleeve 9 and the valve pin 17 are displaced in the axial direction 10 by contact with the filter cartridge 4. The valve assembly 8 is always in the second position when no filter cartridge 4 is attached to the filter head 1, because then the energy storage element 24 (the coil spring) displaces the valve sleeve 9 and the valve pin 17 away from the housing part 2 in the axial direction 10. The valve assembly 8 is always in the first position when the filter head 1 is connected to the filter cartridge 4. Grohe AG 15.12.2025
[0122] A sealing surface 11, 12, 13, 14, 15, 16 describes a linear or planar surface that, in conjunction with another surface, forms a liquid-tight seal. In all cases shown, the sealing surfaces 11, 12, 13, 14, 15, 16 are formed by O-rings or sealing rings, which can form a seal with opposing surfaces of other components.
[0123] The sealing surfaces 11, 12 shown in Figures 3 to 5, 8 and 9, and 11 and 12 (i.e., the first sealing surface 11 and the second sealing surface 12) can also be formed by a single molded seal instead of two O-rings (as shown). This seal then extends in a cylindrical shape over the first sealing surface 11 and the second sealing surface 12.
[0124] In the second position, the first port 5 is fluidically connected to the second port 6. Both ports 5 and 6 are fluidically separated from the surrounding area 19 of the filter head 1. This sealing of the filter head 1 is achieved by the second sealing surface 12, which forms a sealing fit with the connecting part 7. Additionally, the third sealing surface 13 seals the connection between the valve pin 17 and the valve sleeve 9.
[0125] In the second position, the liquid can continue to pass through filter head 1, but the volume 18 of filter cartridge 4 is not traversed. This means that even with filter cartridge 4 disconnected, liquid can still pass through filter head 1, thus preventing stagnation downstream of filter head 1. This facilitates maintaining hygiene in downstream water systems in areas where, for example, tap water is disinfected with chlorine. Grohe AG 15.12.2025
[0126] In the first position, the valve assembly 8 forms a first flow channel 20 and a second flow channel 21 between the connections 5, 6 and the filter cartridge 4. The first flow channel 20 is formed between the valve pin 17 and an inner circumferential surface 22 of the valve sleeve 9, and a second flow channel 21 is formed between the connecting part 7 and an outer circumferential surface 23 of the valve sleeve 9.
[0127] As shown in Figures 7 and 8, the liquid enters the filter head 1 via the second connection 6 and flows through the filter head 1 along the second flow channel 21 towards an annular channel opening 28 of the filter cartridge 4. The liquid then flows through the filter cartridge 4 along a second channel 32 and subsequently a first channel 31. The liquid flows out of the filter cartridge via the centrally located first channel 31 and through the central channel opening 27 towards the filter head 1. In doing so, the liquid is guided via the first flow channel 20 to the first outlet 5 (see Figures 7 and 8; the flow path of the liquid is illustrated by arrows).
[0128] In the first position, the first connection 5 is connected to the first flow channel 20 and the second connection 6 is connected to the second flow channel 21.
[0129] Flow through the flow channels 20, 21 can occur in any direction, i.e., from the filter cartridge 4 to the connection 5, 6 or from the connection 5, 6 to the filter cartridge 4. This allows the flow of liquid to depend on the filter cartridge 4 used.
[0130] The valve pin 17 is supported on the housing part 2 via an energy storage element 24 and can be moved from the first position to the second position by means of the energy storage element 24. Grohe AG 15.12.2025
[0131] The energy storage element 24 is elastically deformed when the filter head 1 is attached to the filter cartridge 4 (i.e., when the valve sleeve 9 and the valve pin 17 move along the axial direction 10, from the second position to the first position). The energy stored in the energy storage element 24 can then be released when the filter cartridge 4 is removed, thereby moving the valve assembly 8 back to the second position.
[0132] In a first position of the valve assembly 8, the first port 5 is fluidically connected to the second port 6 via the volume 18, and in a second position of the valve assembly 8 (Fig. 9), the ports 5, 6 are fluidically directly connected to each other and are fluidically separated from the volume 18 and an environment 19 of the filter head 1.
[0133] Fig. 10 shows the filter cartridge 4 according to Fig. 2, with a second flow direction, in a side view in section. Fig. 11 shows the filter device 25 according to Fig. 1 in use with the filter cartridge 4 according to Fig. 10, in section IV-IV (see Fig. 6). Fig. 12 shows the filter device 25 according to Fig. 11 with the filter device 25 in the second position, section IV-IV (see Fig. 6). Figs. 10 to 12 are described together below. Reference is made to the descriptions of Figs. 1 to 9.
[0134] As shown in Figures 10 and 11, the liquid enters the filter head 1 via the first connection 5 and flows through the filter head 1 along the first flow channel 20 towards a channel opening 27 of the filter cartridge 4. The liquid then flows through the filter cartridge 4 along a first channel 31 and subsequently a second channel 32. Via the second channel 32, which is located outside the first channel 31 (located centrally), the liquid flows out of the filter cartridge 4 towards the filter head 1 via the annular channel opening 28. The liquid is then guided via the second flow channel 21 to the second connection 6 (see Figures 10 and 11; the flow path of the liquid is illustrated by arrows).
[0135] Fig. 13 shows a second embodiment of a filter head 1 in use with the filter device 25 according to Fig. 1, in the first position, in a perspective view in section IV-IV (see Fig. 6). Fig. 14 shows the filter device 25 according to Fig. 13, in the second position, in a perspective view in section IV-IV (see Fig. 6). Figs. 13 and 14 are described together below. Reference is made to the descriptions of Figs. 1 to 12.
[0136] In contrast to the first version, the valve sleeve 9, the connecting part 7, and the filter cartridge 4 are designed differently. The first sealing surface 11 and the second sealing surface 12 are spaced further apart along the axial direction 10 and are arranged on different diameters. These sealing surfaces 11 and 12 are each formed by an O-ring.
[0137] The third sealing surface 13 and the sixth sealing surface 16 are comparable in function and arrangement to those of the first embodiment. Here too, the sixth sealing surface 16 cannot be implemented by an O-ring as shown, but rather by adhesive or a material-bonded connection between the connecting part and the housing part 2. The fourth sealing surface 14 is located on an outer circumferential surface of an outer wall of the second channel 32 of the filter cartridge 4 and interacts with the connecting part 7. Grohe AG 15.12.2025
[0138] The fifth sealing surface 15 is arranged on an outer circumferential surface of an outer wall of the central first channel 31 of the filter cartridge 4 and interacts with the valve sleeve 9.
[0139] As in the first embodiment, in a first position of the valve assembly 8 a flow connection is established between the ports 5, 6 and a volume 18 of the filter cartridge 4 connected to the filter head 1 (Fig. 13), and in a second position of the valve assembly 8 this connection is interrupted (Fig. 14). Here too, flow through the filter assembly 25 and the valve assembly 8 is possible in both directions (see Figs. 7 to 9 and Figs. 10 to 12).
[0140] Fig. 15 shows another filter head 1 in a top-down section. Reference is made to the descriptions of Figs. 1 to 14.
[0141] The filter head 1 serves as a connecting element between a supply line 33 (water inlet line, connected to the second port 6 in Fig. 15) and a water supply device (connected to the first port 5). The filter head 1 is connected to the supply line 33, through which, for example, drinking water is supplied, via one of the ports 5, 6. The water then passes through the filter head 1, through a filter cartridge 4, and subsequently, via a discharge line 34 (water outlet line) located on the filter head 1 and connected to the other port 6, 5, to a water supply device. The water is treated by the filter cartridge 4.
[0142] In Fig. 15, the liquid is fed to the filter head 1 via the second connection 6 and discharged from the filter head 1 via the first connection 5. The valves 29, 30 shown in Fig. 6 are not included here. Grohe AG 15.12.2025
[0143] A changeover switch 35 is provided which connects the supply line 33 to the first terminal 5 or to the second terminal 6 (position of the changeover switch 35 shown) and simultaneously connects the output line 34 to the second terminal 6 or to the first terminal 5 (position of the changeover switch 35 shown).
[0144] The switch 35 is provided as a separate component that is connected to the filter head 1 via terminals 5, 6 (and via short pieces of wire).
[0145] Fig. 16 shows a second embodiment of a filter device 25 in a first side view in section. Fig. 17 shows the filter device 25 according to Fig. 16, in a section further back (parallel). Fig. 18 shows the filter device 25 according to Fig. 16, in a side view in section, rotated by 90 degrees. Fig. 19 shows the filter device 25 in the view according to Fig. 17, with the switch 35 in a first switching position. Figs. 16 to 19 are described together below. Reference is made to the description of Fig. 15.
[0146] The filter head 1 comprises a housing part 2 with a first connection geometry 3 for connection to a filter cartridge 4, a first connection 5 for a liquid, and a second connection 6 for the liquid. The filter head 1 further comprises a connecting part 7 connected to the housing part 2, which forms sealing surfaces 14, 16 with the filter cartridge 4 and the housing part 2, and a valve assembly 8.
[0147] The valve assembly 8 comprises a valve sleeve 9, which is movable relative to the housing part 2 and the connecting part 7 along an axial direction 10 (Grohe AG 15.12.2025) and forms switchable sealing surfaces 11, 12, 13, 15 with the housing part 2, the connecting part 7, and the filter cartridge 4. The valve assembly 8 further comprises a valve pin 17 arranged in the valve sleeve 9 and movable relative to the valve sleeve 9 along the axial direction 10. The valve sleeve 9 has a first sealing surface 11, which switchably interacts with the housing part 2, and a second sealing surface 12, which switchably interacts with the connecting part 7.
[0148] Furthermore, the valve sleeve 9 has a fifth sealing surface 15, which interacts switchably with the filter cartridge 4. The sealing surfaces 11, 12, 15 are each designed as O-rings, which are arranged on an outer circumferential surface of the valve sleeve 9 and each form a sealing seat with a corresponding opposing surface.
[0149] The valve pin 17 has a third sealing surface 13 which interacts with the valve sleeve 9. The sealing surface 13 is also designed as an O-ring, which is arranged on an outer circumferential surface of the valve pin 17 and forms a switchable sealing seat with a corresponding opposing surface on the valve sleeve 9.
[0150] In the first position of the valve assembly 8 shown, a flow connection is established between the ports 5, 6 and a volume 18 of the filter cartridge 4 connected to the filter head 1.
[0151] The switch 35 described in connection with Fig. 15 is provided within the filter head 1. The switch 35 is designed as a sliding element (see arrows, which visualize the movement between the switching positions of the switch 35), which is operated via a control element 47 from the surrounding area 19 of Grohe AG 15.12.2025
[0152] Filter device 25 is operable. The switch 35 has openings 36, 37, 38, 39 through which the connection between the flow channels 20, 21 and the connections 5, 6 can be established.
[0153] Via the switch 35, the first port 5 can be connected to the first flow channel 20 via the first opening 36 (first switching position of the switch 35), and correspondingly the second port 6 can be connected to the second flow channel 2 via the second opening 37. Alternatively, the first port 5 can be connected to the second flow channel 21 via the third opening 38, and the second port 6 can be connected to the first flow channel 20 via the fourth opening 39 (see Figs. 20 to 22). The ports 5 and 6 are always subjected to the same flow pattern, so these ports may have valves 29 and 30.
[0154] Fig. 20 shows the filter device 25 in the view shown in Figs. 17 and 19, with the switch 35 in a second switching position. Fig. 21 shows the filter device 25 according to Fig. 20, with the switch 35 in the second switching position, in a top view, section XXI-XXI according to Fig. 20. Fig. 22 shows the filter device 25 according to Fig. 20, with the switch 35 in the second switching position, in a top view, section XXII-XXII according to Fig. 20. Figs. 20 to 22 are described together below. Reference is made to the descriptions of Figs. 16 to 19.
[0155] Via the switch 35, the first connection 5 is connected to the second flow channel 21 via the third opening 38 and the second connection 6 is connected to the first flow channel 20 via the fourth opening 39.
[0156] Fig. 23 shows the filter device 25 in the view according to Fig. 18. Fig. 24 shows the filter device 25 in the view according to Fig. 19 in a more forward-positioned Grohe AG 15.12.2025
[0157] Section, with the switch 35 in the first switching position and with a bypass 40. Figures 23 and 24 are described together below. Reference is made to the explanations for Figures 1 to 22.
[0158] In the first position of the valve assembly 8 shown, a flow connection is established between the ports 5, 6 and a volume 18 of the filter cartridge 4 connected to the filter head 1.
[0159] The liquid enters the filter head 1 via the first connection 5 and flows through the filter head 1 along the first flow channel 20 towards a channel opening 27 of the filter cartridge 4. The liquid then flows through the filter cartridge 4 along a first channel 31 and subsequently a second channel 32. Via the second channel 32, which is located outside the centrally positioned first channel 31, the liquid flows out of the filter cartridge 4 through the annular channel opening 28 towards the filter head 1. In doing so, the liquid is guided via the second flow channel 21 to the second connection 6 (see Fig. 24; the flow path of the liquid is illustrated by arrows).
[0160] The filter head 1 or the filter device 25 according to Fig. 24 has, in addition to Fig. 23, a bypass 40 through which a first partial quantity 41 of the liquid is directed or can be directed from the first connection 5 to the second connection 6, whereby the first partial quantity 41 only flows through a part of the filter cartridge 4.
[0161] The filter cartridge 4 has a volume 18 through which the liquid can flow. The bypass 40 divides the amount of liquid flowing through the filter head 1 into a first sub-quantity 41 and a second sub-quantity 42. The first sub-quantity 41 is directed through the bypass 40, which is formed by wall openings 48 in the first channel 31, and flows through only a portion of the volume.
[0162] 18 of the filter cartridge 4. The second subset 42 is passed through the entire volume 18 of the filter cartridge 4.
[0163] The bypass 40 is only functional in the first position of the valve assembly (bypass "functional"). This means that in the first position of the valve assembly 8, in which a flow connection is established between the ports 5, 6 and a volume 18 of a filter cartridge 4 connectable to the filter head 1, a first partial quantity 41 of the liquid supplied to the filter head 1 via the first port 5 is supplied to the second port 6, without this first partial quantity 41 of the liquid flowing through the entire volume 18 of the filter cartridge 4 (but only partially).
[0164] The second partial quantity 42 of the liquid, which does not pass through bypass 40, flows through the entire volume 18 of the filter cartridge 4 and then re-enters the filter head 1 and is discharged from the filter head 1 via the second connection 6 (together with the first partial quantity 41 of the liquid). The first partial quantity 41 and the second partial quantity 42 are combined within the filter cartridge 4.
[0165] The filter cartridge 4 comprises a larger first section 43, which is filled with a filter substrate, and a smaller second section 44, which is filled with a filter layer (e.g., activated carbon or felt). The first section 41 essentially flows only through the filter layer (the smaller second section 44), while the second section 42 first flows through the filter substrate (i.e., the larger first section 43) and then through the filter layer. Grohe AG 15.12.2025
[0166] The first subset 41 is introduced into the first sub-area 43 via the wall openings 48, but then in such a way that the first subset 41 only flows through a small partial volume of the first sub-area 43.
[0167] The first sub-area 43 and the second sub-area 44 are separated from each other by a partition wall 45 in which openings 46 are provided.
[0168] In the second position of the valve assembly 8, the bypass 40 is closed (bypass “out of function”), so that no fluid can flow from the first port 5 via the bypass 40 to the second port 6.
[0169] Fig. 25 shows the filter device 25 according to Figs. 16 to 24 in a perspective view. Fig. 26 shows the filter head 1 of the filter device 25 according to Fig. 25 in a perspective view. Fig. 27 shows the filter cartridge 4 of the filter device 25 according to Fig. 25 in a top view. Fig. 28 shows the filter head 1 of the filter device 25 according to Fig. 25 in a position for adjusting the bypass 40, in a side view in section. Fig. 29 shows the filter head 1 according to Fig. 26, with the valve assembly 8 in the second position, in a side view in section. Fig. 30 shows the filter device 25 according to Fig. 25, with the valve assembly 8 in the first position, in a side view in section. Figs. 25 to 30 are described together below. Reference is made to the descriptions of Figs. 16 to 24.
[0170] A first partial flow 41, and thus also the second partial flow 42, is adjustable via the bypass 40. This is achieved by changing the narrowest cross-sectional area 49 of the bypass 40, thereby adjusting the volume flow of the first partial flow 41. The first partial flow 41 can be adjusted in four stages. For this purpose, the valve sleeve 9 is used together with the Grohe AG 15.12.2025
[0171] Valve pin 17 is rotated relative to the filter cartridge 4, so that opposing flow openings 50, 51, i.e. first flow openings 50 in the valve sleeve 9 on the one hand and second flow openings 51 in the filter cartridge 4 on the other hand, form different flowable cross-sectional areas 49 with each other.
[0172] The valve sleeve 9 is rotated on the filter head 1 (see Figs. 26 and 28 to 30). To do this, the valve sleeve 9, together with the valve pin 17, is (manually) moved into the filter head 1 relative to the connecting part 7, so that the tongue-and-groove connection 52 between the valve sleeve 9 and the filter head 1 is released (Fig. 28). In this position, the valve sleeve 9 can be rotated relative to the connecting part 7. The markings “1” to “4” on the connecting part 7, shown in Fig. 26, facilitate the adjustment. After rotation, the valve sleeve 9 is moved away from the filter head 1 again, and the tongue-and-groove connection 52 engages in a new position (Fig. 29). The filter head 1 can then be connected to the filter cartridge 4, whereby the first flow openings 50 and second flow openings 51, which are twisted relative to each other, form altered cross-sectional areas 49 through which flow can be passed.
[0173] Grohe AG 15.12.2025
[0174] Reference symbol list
[0175] 1 filter head
[0176] 2 Housing part
[0177] 3 first connection geometry
[0178] 4 filter cartridges
[0179] 5 first connection
[0180] 6 second connection
[0181] 7 Connecting part
[0182] 8 Valve assembly
[0183] 9 Valve sleeve
[0184] 10 axial direction
[0185] 11 first sealing surface
[0186] 12 second sealing surface
[0187] 13 third sealing surface
[0188] 14 fourth sealing surface
[0189] 15 fifth sealing surface
[0190] 16 sixth sealing surface
[0191] 17 Valve pin
[0192] 18 volumes
[0193] 19 surroundings
[0194] 20 first flow channel
[0195] 21 second flow channel
[0196] 22 Inner circumference area
[0197] 23 External perimeter area
[0198] 24 Energy storage element
[0199] 25 Filter device
[0200] 26 second connection geometry Grohe AG 15.12.2025
[0201] 27 central channel opening
[0202] 28 Ring channel opening
[0203] 29 first valve
[0204] 30 second valve
[0205] 31 first channel
[0206] 32 second channel
[0207] 33 Supply line
[0208] 34 Derivative
[0209] 35 switches
[0210] 36 first opening
[0211] 37 second opening
[0212] 38 third opening
[0213] 39 fourth opening
[0214] 40 Bypass
[0215] 41 first subset
[0216] 42 second subset
[0217] 43 first sub-area
[0218] 44 second sub-area
[0219] 45 partition wall
[0220] 46 Breakthrough
[0221] 47 Control element
[0222] 48 Wall opening
[0223] 49 cross-sectional area
[0224] 50 first flow opening
[0225] 51 second flow opening
[0226] 52 Tongue and groove joint
Claims
Grohe AG 15.12.2025 Patent claims 1. Filter head (1), at least comprising • a housing part (2) with o a first connection geometry (3) for connection to a filter cartridge (4); o a first connection (5) for a liquid; and o a second connection (6) for the liquid; • a connecting part (7) connected to the housing part (2), • a valve assembly (8) comprising a valve sleeve (9) which is movable relative to the housing part (2) and the connecting part (7) along an axial direction (10) and which forms at least switchable sealing surfaces (11, 12, 13, 14, 15, 16) with the housing part (2) and the connecting part (7); and a valve pin (17) arranged in the valve sleeve (9) and movable relative to the valve sleeve (9) along the axial direction (10); wherein the valve sleeve (9) has at least a first sealing surface (11) which switchably interacts with the housing part (2), and a second sealing surface (12) which switchably interacts with the connecting part (7); wherein the valve pin (17) has a third sealing surface (13) which switchably interacts with the valve sleeve (9);wherein in a first position of the valve device (8) a flow-technical connection is established between the ports (5, 6) and a volume (18) of a filter cartridge (4) connectable to the filter head (1) and in a second position of the valve device (8) this connection is interrupted.; Grohe AG 15.12.2025 2. Filter head (1) according to claim 1, wherein in the second position the first connection (5) is fluidly connected to the second connection (6) and both connections (5, 6) are fluidly separated from an environment (19) of the filter head (1).
3. Filter head (1) according to one of the preceding claims, wherein in the first position a first flow channel (20) and a second flow channel (21) are formed between the connections (5, 6) and the filter cartridge (4) by the valve device (8); wherein the first flow channel (20) is formed between the valve pin (17) and an inner circumferential surface (22) of the valve sleeve (9) and the second flow channel (21) is formed between the connecting part (7) and an outer circumferential surface (23) of the valve sleeve (9).
4. Filter head (1) according to claim 3, wherein in the first position the first connection (5) is connected to the first flow channel (20) and the second connection (6) is connected to the second flow channel (21).
5. Filter head (1) according to one of the preceding claims 3 and 4, wherein the flow direction of the liquid through the filter head (1) is switchable.
6. Filter head (1) according to claim 5, at least comprising a switch (35) by which, in a first switching position, the first connection (5) is connected to the first flow channel (20) and the second connection (6) to the second flow channel (21), and in a second switching position, the first Grohe AG 15.12.2025 Connection (5) is connected to the second flow channel (21) and the second connection (6) is connected to the first flow channel (20).
7. Filter head (1) according to one of the preceding claims, wherein the valve pin (17) is supported on the housing part (2) via an energy storage element (24) and can be moved from the first position to the second position by the energy storage element (24).
8. Filter device (25), comprising at least a filter head (1) according to one of the preceding claims and a filter cartridge (4) with a volume (18), wherein the filter cartridge (4) has a second connection geometry (26) via which it can be connected to the first connection geometry (3) to form the filter device (25); wherein in a first position of the valve device (8) the first connection (5) is fluidically connected to the second connection (6) via the volume (18) and in a second position of the valve device (8) the connections (5, 6) are fluidically directly connected to each other and are fluidically separated from the volume (18) and an environment (19) of the filter head (1).
9. Filter device (25) according to claim 8, wherein, for the purpose of forming a connection between the filter head (1) and the filter cartridge (4), the valve sleeve (9) and thus also the valve pin (17) can be moved from a second position of the valve device (8) into the housing part (2) and thus into the first position by contact with the filter cartridge (4).
10. Filter device (25) according to one of the preceding claims 8 and 9, wherein in the manufacture of a connection between filter head (1) and Grohe AG 15.12.2025 Filter cartridge (4) first separates the volume (18) from an environment (19) by means of the filter head (1) and then establishes a flow connection between the connections (5, 6) and the volume (18).
11. Filter device (25) according to claim 10, wherein the volume (18) can be fluidically separated from the environment (18) by a fourth sealing surface (14) which is arranged on the connecting part (7) or on the filter cartridge (4).
12. Filter device (25) according to claim 11, wherein the filter cartridge (4) has a central channel opening (27) and an annular channel opening (28) extending around the central channel opening (27), via which the volume (18) is connected to the connections (5, 6) in the first position; wherein in the first position the channel openings (27, 28) are only fluidically connected to each other via the volume (18) and the central channel opening (27) is fluidically separated from the annular channel opening (28) by a fifth sealing surface (15) which is arranged on the valve sleeve (9) or on the filter cartridge (4).
13. Filter device according to any one of the preceding claims 8 to 12, at least comprising a bypass (40) through which, only when the valve device (8) is in the first position, a first partial quantity (41) of the liquid can be directed from one port (5, 6) to the other port (6, 5), wherein a second partial quantity (42) flows through the volume (18), wherein the first partial quantity (41) of the liquid only flows through a part of the volume (18). Grohe AG 15.12.2025 14. Filter device according to claim 13, wherein one of the first subset (41) defining, flowable cross-sectional area (49) of the bypass (40) is changeable.