Filter head and a filter device

Abstract

Filter head (1), at least encompassing • a housing part (2) with ◯ a first connection geometry (3) for connection to a filter cartridge (4); ◯ a first connection (5) for a liquid; as well as ◯ a second connection (6) for the liquid; • a connecting part (7) connected to the housing part (2), • a valve assembly (8) with ◯ 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 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 upper sealing surface (11) which interacts switchably with the housing part (2) and a second upper sealing surface (12) which interacts switchably with the connecting part (7); wherein the valve pin (17) has a third sealing surface (13) which interacts with the valve sleeve (9).

Description

[0001] 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.

[0002] 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.

[0003] 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.

[0004] 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.

[0005] A replaceable filter cartridge used for this purpose can, for example, include an ion exchange material to soften the water and activated carbon to remove pollutants and bacteria.

[0006] 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.

[0007] Filter devices that filter and soften tap water are widely known. The direction of water filtration varies depending on the manufacturing process or 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 supply line or appliance side. 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.

[0008] When using filter cartridges with different water filtration directions, the filter head must be designed to match the water inlet and outlet of each 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.

[0009] 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.

[0010] 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.

[0011] A filter head is proposed, at least comprehensively. • a housing part with ◯ a first connection geometry for connection to a filter cartridge; ◯ a first connection for a liquid; as well as ◯ a second connection for the liquid; • a connecting part attached to the housing part, • a valve assembly with ◯ a valve sleeve which is movable relative to the housing part and the connecting part along an axial direction and forms sealing surfaces that can be switched with at least the housing part and the connecting part; and ◯ a valve pin arranged in the valve sleeve and movable relative to the valve sleeve along the axial direction. The valve sleeve has at least a 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.

[0012] 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.

[0013] 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.

[0014] The water supply device includes, in particular, an outlet for water or other liquid. The liquid can be dispensed via this outlet and / or filled into a drinking vessel, such as a bottle, glass, or cup.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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 through one of the ports and is then introduced into the volume of a filter cartridge connected to the filter head. After passing through this volume, the liquid re-enters the filter head and is discharged from the filter head through the other port.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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 designed to be switchable, meaning they can be switched between a sealed and an unsealed state. This also applies to a fourth sealing surface (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 designed to be non-switchable (because these parts are only joined together once during the manufacturing of the filter head).

[0024] 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.

[0025] 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.

[0026] This makes it easier to maintain hygiene in downstream water systems in areas where, for example, tap water is disinfected with chlorine.

[0027] 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 formed between the valve pin and an inner circumferential surface of the valve sleeve, and the second flow channel is formed between the connecting part and an outer circumferential surface of the valve sleeve.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] A further filter device is proposed, comprising at least the described filter head and a filter cartridge with a volume, 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.

[0033] 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.

[0034] 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.

[0035] This prevents liquid from leaking out of the filter head.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The statements regarding the filter head apply equally to the filter device and vice versa.

[0040] The use of indefinite articles (“a”, “an”, “one”, and “ones”), 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.

[0041] 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 it will be obvious to a person skilled in the art upon studying the specific configuration described. Where 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.

[0042] 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: Fig. 1: a filter device in a side view; Fig. 2: the filter cartridge of the filter device according to Fig. 1 with a second connection geometry in a perspective view; Fig. 3: a first embodiment of a filter head of the filter device according to Fig. 1 in an exploded view, in perspective view; Fig. 4: the filter device after Fig. 1 in a perspective section view; with the valve assembly in the first position; Fig. 5: the filter device after Fig. 4 in a perspective section view; with the valve assembly in the second position; Fig. 6: the filter head after Fig. 3 in a top-down section view; Fig. 7: the filter cartridge after Fig. 2, with a first flow direction, in a side view in section; Fig. 8: the filter device after Fig. 1 in use with the filter cartridge after Fig. 7; Fig. 9: the filter device after Fig. 8 with the filter device in the second position; Fig. 10: the filter cartridge after Fig. 2, with a second flow direction, in a side view in section; Fig. 11: the filter device after Fig. 1 in use with the filter cartridge after Fig. 10; Fig. 12: the filter device after Fig. 11 with the filter device in the second position; Fig. 13: a second variant of a filter head in use with the filter device according to Fig. 1, in the first position, in a perspective view in section; and Fig. 14: the filter device after Fig. 13, in the second position, in a perspective view in section.

[0043] Fig. Figure 1 shows a filter device 25 in a side view. Fig. Figure 2 shows the filter cartridge 4 of the filter device 25. Fig. 1 with a second connection geometry 26 in a perspective view. The Fig. 1 and Fig. The two will be described together below.

[0044] 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 connects to the first connection geometry 3 (see Fig. 4 and Fig. 5) can be connected to form the filter device 25.

[0045] Fig. Figure 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 view. Fig. Figure 4 shows the filter device 25 after Fig. 1 in a perspective view in section IV-IV (see Fig. 6); with the valve assembly 8 in the first position. Fig. Figure 5 shows the filter device 25 after Fig. 4 in a perspective view in section (as Fig. 4); with the valve assembly 8 in the second position. Fig. 6 shows the filter head 1 after Fig. 3 in a top view in section VI-VI (see Fig. 1). Fig. 7 shows the filter cartridge 4 after Fig. 2, with a first flow direction, in a side view in section. Fig. 8 shows the filter device 25 after Fig. 1 in use with filter cartridge 4 after Fig. 7, on average IV-IV (see Fig. 6). Fig. Figure 9 shows the filter device 25 after Fig. 8 with the filter device 25 in the second position, in section IV-IV (see Fig. 6). The Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. The nine items are described together below. The explanations regarding the following... Fig. 1 and Fig. 2 is referred to.

[0046] 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.

[0047] 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, and a second sealing surface 12, which switchably interacts with the connecting part 7.

[0048] 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.

[0049] 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.

[0050] 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).

[0051] The filter head 1 serves as a connecting part between a water-carrying pipe (water supply pipe, in Fig. 8 connected, e.g., to the second connection 6) and a water supply unit (in Fig. 9 connected to the first connection 5). The filter head 1 is connected to one of the connections 5, 6, for example, to a water supply line through which drinking water is supplied. The water can then pass through the filter head 1, through a filter cartridge 4, and subsequently, via a water outlet line located on the filter head 1 and connected to the other connection 6, 5, to the water supply unit. The water can be treated by the filter cartridge 4.

[0052] 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.

[0053] 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 located 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.

[0054] 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.

[0055] 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 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 between these connections.

[0056] 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, i.e., 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 a filter cartridge 4 connected to the filter head 1. After flowing 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.

[0057] In the second position of the valve assembly 8 ( Fig. 5) The flow connection between ports 5, 6 and the volume 18 of the filter cartridge 4 is severed. No liquid escapes from the filter head 1.

[0058] 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 valve sleeve 9 and the valve pin 17 are displaced away from the housing part 2 in the axial direction 10 by the energy storage element 24 (the coil spring). The valve assembly 8 is always in the first position when the filter head 1 is connected to the filter cartridge 4.

[0059] 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.

[0060] The in the Fig. The sealing surfaces 11 and 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 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.

[0061] 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.

[0062] In the second position, the liquid can continue to pass through the filter head 1, but the volume 18 of the filter cartridge 4 is not traversed. This means that even with the filter cartridge 4 disconnected, liquid can still pass through the filter head 1, thus preventing stagnation downstream of the filter head 1. This facilitates maintaining hygiene in downstream water systems in areas where, for example, tap water is disinfected with chlorine.

[0063] 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.

[0064] According to Fig. 7 and Fig. 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 from the filter cartridge towards the filter head 1 via the centrally located first channel 31 and the central channel opening 27. In doing so, the liquid is guided via the first flow channel 20 to the first outlet 5 (see Fig. 7 and Fig. 8; The flow pattern of the liquid is illustrated by arrows).

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 connections 5, 6 are directly connected to each other in terms of flow technology and are separated in terms of flow technology from the volume 18 and an environment 19 of the filter head 1.

[0070] Fig. 10 shows the filter cartridge 4 after Fig. 2, with a second flow direction, in a side view in section. Fig. Figure 11 shows the filter device 25 after Fig. 1 in use with filter cartridge 4 after Fig. 10, on average IV-IV (see Fig. 6). Fig. Figure 12 shows the filter device 25 after Fig. 11 with the filter device 25 in the second position, section IV-IV (see Fig. 6). The Fig. 10, Fig. 11 to Fig. The 12 are described together below. The explanations regarding the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig. 9 is referred to.

[0071] According to Fig. 10 and Fig. 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 centrally positioned first channel 31, the liquid flows out of the filter cartridge 4 towards the filter head 1 via the annular channel opening 28. In doing so, the liquid is guided via the second flow channel 21 to the second connection 6 (see Fig. 10 and Fig. 11; The flow pattern of the liquid is illustrated by arrows).

[0072] Fig. Figure 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. Figure 14 shows the filter device 25 after Fig. 13, in the second position, in a perspective view in section IV-IV (see Fig. 6). The Fig. 13 and Fig. The 14 items are described together below. The explanations regarding the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11 to Fig. Reference is made to point 12.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] As with the first embodiment variant, in a first position of the valve device 8 a flow-technical connection is established between the connections 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 Figure 1). Fig. 7, Fig. 8 to Fig. 9 and Fig. 10, Fig. 11 to Fig. 12). Reference symbol list 1 filter head 2 Housing part 3 first connection geometry 4 filter cartridges 5 first connection 6 second connection 7 Connecting part 8 Valve assembly 9 Valve sleeve 10 axial direction 11 first sealing surface 12 second sealing surface 13 third sealing surface 14 fourth sealing surface 15 fifth sealing surface 16 sixth sealing surface 17 Valve pin 18 volumes 19 surroundings 20 first flow channel 21 second flow channel 22 Inner circumference area 23 External perimeter area 24 Energy storage element 25 Filter device 26 second connection geometry 27 central channel opening 28 Ring channel opening 29 first valve 30 second valve 31 first channel 32 second channel

Claims

Filter head (1), comprising at least: • 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; • a connecting part (7) connected to the housing part (2); • a valve assembly (8) with 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 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 interacts switchably with the housing part (2) and a second sealing surface (12) which interacts switchably with the connecting part (7);wherein the valve pin (17) has a third sealing surface (13) which interacts switchably with the valve sleeve (9); wherein in a first position of the valve assembly (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 assembly (8) this connection is interrupted.; 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). 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). 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). 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). 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). Filter device (25) according to claim 6, wherein, for the production of a connection between filter head (1) and 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). Filter device (25) according to one of the preceding claims 6 and 7, wherein, in the production of a connection between filter head (1) and filter cartridge (4), the volume (18) is first separated from an environment (19) by the filter head (1) in a fluid-technical manner and then a fluid-technical connection is established between the connections (5, 6) and the volume (18). Filter device (25) according to claim 8, 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). Filter device (25) according to claim 9, 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).

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