Valve device for a fuel cell system and fuel cell system having a valve device

Abstract

The invention relates to a valve device (10) for a fuel cell system (100), comprising: a valve housing (12) in which a flow channel (20) is arranged which is unidirectionally flowed through in an axial direction and fluidically connects a valve inlet (26) to a valve outlet (28), wherein a control valve (22) is formed on the inlet side in the flow channel and a blocking valve (24) is formed on the outlet side; a single valve body (30) which is arranged in the flow channel (20); an electromagnetic actuator (50) by means of which the valve body (30) can be moved in the axial direction in the flow channel (20); wherein the valve body (30) has, at the first inlet-side axial end (32) of the valve body, a control valve body (34) which is assigned to the control valve (22) and which interacts with a control valve seat (62), as a result of which a control cross-section (23) can be defined, and wherein the valve body (30) has, at the second outlet-side axial end (42) of the valve body, a blocking valve body (44) which is assigned to the blocking valve (24) and which interacts with a blocking valve seat (48), as a result of which the flow channel (20) can be blocked or released. The valve device (10) combines two different valves, which have hitherto been designed in particular in a fuel cell system (100) as individual separate valves, into one valve, which results in advantages in terms of costs and installation space.

Description

[0001] PI. P.24001.WO / EBFS 12 / 13 / 2024

[0002] - 1 -

[0003] Valve device for a fuel cell system and fuel cell system with a valve device

[0004] Description

[0005] The present invention relates to a valve device for a fuel cell system. Furthermore, the present invention relates to a fuel cell system with a valve device.

[0006] Such a valve device typically has a valve body that can be moved in the direction of flow by means of an electromagnetic actuator within an internal flow channel to open a flow cross-section, thus enabling precise control of a fluid volume flow when the actuator is energized. A disadvantage of this design is that, when the actuator is not energized, the valve body can be forced into an open position by pressure applied to the inlet side.

[0007] Such a proportional valve device is used, for example, in a fuel cell system, where the valve device controls the hydrogen flow in a hydrogen supply path of the fuel cell system. The valve device is, for example, fluidically arranged in a hydrogen supply path between a hydrogen tank and a fuel cell unit, the so-called fuel cell stack, and controls the amount of hydrogen supplied to the fuel cell unit during operation.

[0008] Due to the aforementioned design-related disadvantages of the valve device, after the fuel cell system is switched off, the pressure prevailing in the hydrogen tank can force the valve body into the open position, so that hydrogen unintentionally enters the fuel cell unit.

[0009] The present invention therefore aims to provide a valve device that, when energized, precisely controls a fluid volume flow rate. PI. P.24001.WO / EBFS 13.12.2024

[0010] - 2 - enables and securely closes an internal flow channel in the unpowered state.

[0011] This problem is solved according to the invention by a valve device having the features of claim 1. Furthermore, this problem is solved by a fuel cell system with a valve device according to the invention.

[0012] The valve device according to the invention for a fuel cell system comprises a valve housing in which a flow channel is arranged with unidirectional flow in an axial direction, fluidically connecting a valve inlet to a valve outlet. A fluid, preferably gaseous hydrogen, flows into the flow channel at the valve inlet and out of the flow channel at the valve outlet. A control valve, designed as a proportional valve to quantitatively control the fluid flow rate, is formed on the inlet side of the flow channel. A blocking valve, designed to block or release the fluid flow rate, is formed on the outlet side of the flow channel.

[0013] Furthermore, the valve device comprises a valve body arranged in the flow channel. The valve body is movable in the axial direction within the flow channel by means of an electromagnetic actuator. For this purpose, the actuator has a currentable coil which, when energized, moves the valve body from its rest position, whereby the axial position of the valve body can be controlled relatively precisely by varying the coil voltage.

[0014] The valve body has a control valve body at its first inlet-side axial end, i.e., the end facing the valve inlet. This control valve body is associated with the control valve and interacts with a control valve seat, thereby defining a control cross-section. In particular, the control valve, and thus the control cross-section, is formed by the control valve body and the control valve seat, wherein the preferably annular control valve seat can, for example, be formed by an inlet-side radial inner wall section of the flow channel. Alternatively, the control valve seat can be formed by a separate valve seat element, PI. P.24001 .WO / EBFS 13.12.2024

[0015] - 3 - for example, a rubber-elastic sealing element may be formed, which can be arranged in the flow channel. The control cross-section is a flow cross-section through which the fluid volume flow is quantitatively controlled. By axially displacing the control valve body, which can be controlled by correspondingly energizing the electromagnetic actuator in control mode, the cross-sectional area of ​​the control cross-section can be changed as required, thereby allowing relatively precise control of the fluid volume flow through the control cross-section. This precise controllability is achieved in particular by the fact that when the valve body moves in the direction of flow, the control cross-section is enlarged, so that even relatively small flow cross-sections can be set.

[0016] The valve body can be moved against the flow direction to such an extent that it can be fully axially seated onto the control valve seat, ensuring a fluid-tight seal and completely closing the flow channel. This position of the valve body is assumed particularly at the beginning of control operation. Advantageously, the control valve body has a flow-optimized shape, such as a cone, ellipsoid, or teardrop shape, allowing the flow to pass around it with minimal resistance and turbulence. Ideally, the control valve body has an outwardly convex surface, while the control valve seat has a flat, for example, conical surface, thus creating a linear contact when the control valve body is seated on the control valve seat.Similarly, the control valve seat can have a convex surface, while the control valve body then has a flat surface. Alternatively, both the control valve seat and the control valve body can have convex surfaces. Furthermore, the control valve can be designed such that the control cross-section is not completely sealable, but rather exhibits an intentional leakage.

[0017] Furthermore, the valve body has a blocking valve body at its second outlet-side axial end, i.e., the end facing the valve outlet. This blocking valve body is associated with the blocking valve and interacts with a blocking valve seat, PI. P.24001.WO / EBFS 13.12.2024

[0018] - 4 - whereby the flow channel can be blocked or released. The blocking valve body and the control valve body are thus formed on or connected to a single common valve body, so that the blocking valve body and the control valve body are connected to each other through the common valve body.

[0019] The blocking valve seat is formed in the flow channel, with the blocking valve body preferably being axially mounted onto the blocking valve seat. The blocking valve seat is preferably annular in shape. Furthermore, the blocking valve seat is preferably formed by a radial inner wall section in the flow channel. Alternatively, the blocking valve seat can be formed by a separate valve seat element, for example, a rubber-elastic sealing element, which can be arranged in the flow channel. In the rest position, i.e., when the actuator is in the de-energized state, the blocking valve body rests against the blocking valve seat, thereby closing the flow channel.Here, the valve body is pressed in the direction of flow by means of a permanently applied fluid pressure on the inlet side, so that the blocking valve body is permanently pressed axially against the blocking valve seat in the rest position and fits against it fluid-tight. The valve device is thus in a closed position when de-energized, whereby the outlet-side arrangement of the blocking valve body on the valve body prevents the valve device from being forced into an open position by the fluid pressure. This creates a so-called fail-safe mechanism that reliably closes the flow channel when de-energized.

[0020] Advantageously, the blocking valve body has a flow-optimized shape, such as a cone, ellipsoid, or teardrop shape, so that the flow can pass around the blocking valve body with minimal resistance and turbulence. Ideally, the blocking valve body has an outwardly convex surface, whereas the blocking valve seat has a flat, for example, conically shaped surface, so that a line-like contact is created when the blocking valve body is placed on the blocking valve seat. Likewise, the valve seat can also have a convex surface, while the blocking valve body then has a flat surface. Alternatively, the blocking valve body can be cylindrical, in which case its axial end face PI. P.24001.WO / EBFS 13.12.2024

[0021] - 5 - for example, on a tapered axial projection forming the blocking valve seat, preferably a sealing lip, so that a line contact is formed which produces a relatively high sealing effect.

[0022] In control mode, the valve body is moved by the actuator against the flow direction into an initialization position, in which the control valve body is seated on the control valve seat. This lifts the blocking valve body from the blocking valve seat, thus opening the flow channel on the outlet side of the valve body. In control mode, the valve body is moved to an intermediate position by varying the coil current of the actuator to adjust the fluid flow rate, whereby the fluid flow rate can be precisely adjusted by varying the control cross-section. In this intermediate position, the blocking valve is open and the flow channel on the outlet side is open. However, from a fluid dynamics perspective, the valve body stroke in the intermediate position is limited because, in control mode, the flow cross-section relevant for the flow rate is always the control cross-section.For precise controllability during control operation, the control cross-section must therefore always be smaller than a flow cross-section formed on the outlet side of the valve body, for example a flow cross-section formed between the blocking valve body and the blocking valve seat.

[0023] At the moment of shutdown, the blocking valve body is moved by the fluid pressure towards the blocking valve seat until it contacts the seat. The blocking valve is therefore pressure-controlled. Additionally, a spring element can be used to further bias the blocking valve body towards the blocking valve seat, ensuring that the blocking valve remains closed even in the event of a pressure drop on the inlet side.

[0024] The valve device according to the invention combines, in a sense, two individual valves into one valve device, wherein the two individual valves, namely a control valve and a blocking valve, have a common valve body. The control valve is designed as a proportional valve, while the blocking valve performs the function PI. P.24001.WO / EBFS 13.12.2024

[0025] - 6 - has the ability to either open or block the flow channel. Thus, two valves are combined cost-effectively into a single valve device.

[0026] In a particularly preferred embodiment of the invention, the control valve body and the blocking valve body are arranged coaxially. The control valve body and the blocking valve body are each designed as rotating bodies, with their respective axes of rotation aligned coaxially. Consequently, the control valve seat and the blocking valve seat are also arranged coaxially, which simplifies the assembly process. Furthermore, it is ensured that both the control valve body and the blocking valve body can be fully and fluid-tightly mounted on their respective valve seats.

[0027] In a further preferred embodiment of the invention, the flow channel is linear. The flow channel therefore has no curves or bends with respect to its axial extent, so that no significant deflection of the fluid flow occurs. Nevertheless, the flow channel can have constrictions or expansions with respect to its cross-section, particularly in the area of ​​the valve seats. Consequently, the valve inlet and the valve outlet are also arranged coaxially with respect to each other, so that the flow channel is traversed exclusively in the axial direction.

[0028] In a particularly advantageous embodiment of the invention, the valve body is made of plastic and has a metallic casing. The metallic casing is preferably tubular, and more preferably circular, forming a type of metal sleeve that is, for example, slid over the plastic body and firmly connected to it, so that no relative movement can occur between the plastic body and the metal casing. The metal sleeve is made of a magnetizable, preferably a ferromagnetic, material, so that it can interact with the magnetic field of the coil of the electromagnetic actuator, thereby making the valve body movable in the axial direction by means of the actuator. The control valve body and the blocking valve body are preferably formed by or integrally molded onto the plastic body, so that even more complex geometries can be produced relatively easily. PI. P.24001.WO / EBFS 13.12.2024

[0029] - 7 - can be manufactured cost-effectively. Alternatively, the control valve body and / or the blocking valve body can be designed as separate components that are firmly connected to the plastic body.

[0030] In a further advantageous embodiment of the invention, the valve body is guided on a radial inner wall of the flow channel. The valve body thus rests partially or completely against the radial inner wall of the flow channel, and is preferably arranged with a slight radial clearance, for example with a clearance fit in a guide section of the flow channel, so that the valve body is relatively easy to move within the flow channel. The radial inner wall can be formed by the valve housing or by a guide element arranged in the valve housing, for example by a guide sleeve.

[0031] In a further preferred embodiment of the invention, the valve body is cylindrical. Consequently, the flow channel in the guide section is also cylindrical. This makes both the valve body and the flow channel relatively easy to manufacture. Furthermore, no special orientation of the valve body with respect to the tangential direction is necessary. In combination with the coaxial arrangement of the control valve body and the blocking valve body, which are each arranged coaxially with respect to the cylindrical axis of the valve body, this results in a relatively simple and cost-effective design of the valve device.

[0032] In a further particularly advantageous embodiment of the invention, the valve body has at least one fluid channel that extends axially completely through the valve body. The fluid channel allows the fluid volume flow during control operation to flow from the inlet-side axial end of the valve body, through the valve body, to the outlet-side axial end of the valve body. This enables the valve body to be designed with an uninterrupted radial surface through which the valve body is guided in the flow channel. The fluid channel is preferably linear, so that PI. P.24001.WO / EBFS 13.12.2024

[0033] - 8 - a uniform flow can develop in the fluid channel. The valve body preferably has several fluid channels.

[0034] Preferably, the fluid channel is arranged eccentrically with respect to a central axis of the valve body. Particularly preferably, the fluid channel is arranged so far eccentrically that the radius of a radially inner edge of an inlet opening of the fluid channel is larger than the radius of the control valve seat and / or the blocking valve seat. Due to the eccentric arrangement of the fluid channel, several fluid channels can be spaced apart from each other in the circumferential direction, allowing a relatively large fluid volume flow to pass through the valve body. In this case, the sum of the cross-sectional areas of all fluid channels is greater than the control cross-sectional area.

[0035] In a further advantageous embodiment of the invention, the control valve body and / or the locking valve body comprises a rubber-elastic sealing element. The rubber-elastic sealing element can, for example, be permanently connected to the valve body as a separate sealing element. Alternatively, the control valve body and / or the locking valve body can have a completely or partially, but at least in the respective section that can be placed on the corresponding valve seat, encased in a rubber-elastic material, wherein the encasement completely surrounds the control valve body and / or the locking valve body in the circumferential direction. In a further alternative, the respective section can each have a sleeve made of rubber-elastic material that surrounds the control valve body and / or the locking valve body in the circumferential direction.

[0036] In a particularly preferred embodiment of the invention, the control valve body and / or the blocking valve body are formed integrally with the valve body. "Integral" is understood to mean, in particular, at least materially bonded, such as by a welding and / or bonding process, and especially preferably integrally formed, such as by manufacturing from a single casting and / or by manufacturing using a single- or multi-component injection molding process. Particularly when manufacturing the valve body from plastic, relatively [PI. P.24001.WO / EBFS 13.12.2024]

[0037] - 9 - complex, especially aerodynamically efficient geometries can be produced simply and cost-effectively.

[0038] According to another aspect of the present invention, a fuel cell system with a valve device having the aforementioned features is proposed.

[0039] The fuel cell system preferably comprises a fuel cell unit and a hydrogen tank in which hydrogen is stored to supply the fuel cell unit. The fuel cell unit, often referred to as a fuel cell stack, has an anode and a cathode, with the hydrogen being supplied to the anode. The valve device is fluidically arranged in a hydrogen supply path between the fuel cell unit and the hydrogen tank and controls the amount of hydrogen withdrawn from the hydrogen tank and the amount supplied to the fuel cell unit.The design of the valve device according to the invention allows the amount of hydrogen supplied to the fuel cell unit to be controlled relatively precisely by the control cross-section of the control valve of the valve device. Conversely, after the fuel cell system is switched off, the hydrogen supply path is reliably closed by blocking the flow channel within the valve using the blocking valve, so that no hydrogen can flow from the hydrogen tank into the fuel cell unit when the valve device is de-energized. The blocking valve body is held securely in the closed position by the pressure applied on the inlet side.The inlet pressure is generated by the hydrogen tank, with a pressure reducing device, for example a pressure relief valve, arranged between the valve device and the hydrogen tank, which reduces the pressure of the hydrogen coming from the hydrogen tank before it enters the valve device.

[0040] The valve device according to the invention combines two different valves, which until now have been used, particularly in a fuel cell system, as separate individual valves. PI. P.24001.WO / EBFS 13.12.2024

[0041] - 10 -

[0042] The valves were designed in one piece, resulting in cost and space-saving advantages.

[0043] An embodiment of the present invention is described below with reference to the accompanying figures. These show:

[0044] Figure 1 shows a valve device according to the invention in a longitudinal sectional view along the central axis in standby mode.

[0045] Figure 2 shows the valve device of Figure 1 in a longitudinal sectional view along the central axis in the initialization position,

[0046] Figure 3 shows a valve device of Figure 1 in a longitudinal sectional view along the central axis in control operation,

[0047] Figure 4 shows the valve body of the valve device of Figure 1 in a cross-sectional view, and

[0048] Figure 5 shows a fuel cell system with a valve device according to the invention in a system diagram.

[0049] Figure 1 shows a valve device 10 for a fuel cell system 100 with a multi-part valve housing 12 in which a linear flow channel 20 is arranged, allowing unidirectional flow in an axial direction. The flow direction S is indicated by corresponding arrows. The flow channel 20 has a valve inlet 26, formed by a first housing part 13, and a valve outlet 28, formed by a second housing part 11, wherein the valve inlet 26 and the valve outlet 28 are fluidically connected to each other via the flow channel 20. A control valve 22 is arranged on the inlet side of the flow channel 20. A blocking valve 24 is arranged on the outlet side of the flow channel 20. The first housing part 13 and the second housing part 11 are rigidly and fluid-tightly connected to each other, for example by bonding or welding. PI. P.24001.WO / EBFS 13.12.2024

[0050] - 11 -

[0051] The valve device 10 also comprises a single valve body 30, which is arranged in the flow channel 20. Furthermore, the valve device 10 comprises an electromagnetic actuator 50 with a coil 52, which is arranged in the valve housing 12 and by means of which the valve body 30 is movable in the axial direction in the flow channel 20. The valve body 30 is cylindrical and guided radially in the flow channel 20, with a correspondingly cylindrical radial inner wall 21, which radially delimits the flow channel 20 in a guide section 27, such that the valve body 30 bears at least partially radially against the inner wall 21. The radial inner wall 21 is formed by a third housing part 14, which is designed in the form of a guide sleeve 15, and which is rigidly and fluid-tightly connected to the other two housing parts 11, 13.The diameters of the radial inner wall 21 and the valve body 30 are dimensioned such that a clearance fit is formed, allowing the valve body 30 to move relatively easily in the flow channel 20.

[0052] The valve body 30 is multi-part and comprises a plastic body 35 enclosed by a metallic casing 36, as shown in Figure 4. The plastic body 35 has several radially outwardly extending ribs 37, which extend axially from the inlet-side axial end 32 to the outlet-side axial end 42 of the valve body 30. The ribs 37 are spaced apart from each other circumferentially. The metallic casing 36 is designed as a circular, ferromagnetic sleeve 39, which is slid over the plastic body 35. The sleeve 39 bears against a respective radial outer wall of the ribs 37 with its radial inner wall and is firmly connected to it. An adhesive bond can be used for this purpose, for example. However, other suitable joining methods can also be employed.

[0053] Between each pair of adjacent ribs 37, a fluid channel 38 is formed, which is bounded radially on the inside by the plastic body 35 and radially on the outside by the sleeve 39. Each fluid channel 38 extends completely through the valve body 30, so that a fluid volume flow PI flows through the flow channel 20. P.24001.WO / EBFS 13.12.2024

[0054] - 12 - can flow through the valve body 30 from the inlet-side axial end 32 to the outlet-side axial end 42.

[0055] Figure 1 further shows that the valve body 30 has a control valve body 34 at its first inlet-side axial end 32, which has an ellipsoidal shape. The control valve body 34 is designed as a half-ellipsoid whose taper is directed opposite to the flow direction S, so that the control valve body 34 has a flow-optimized design and can be relatively easily flowed around by the oncoming flow. The control valve body 34 is associated with the control valve 22 and can be axially mounted on a control valve seat 62, the control valve seat 62 being formed by the first housing part 13 and being conically shaped.

[0056] At its second outlet-side axial end 42, the valve body 30 has a blocking valve body 44, which is associated with the blocking valve 24 and by means of which the flow channel 20 can be blocked or released. The blocking valve body 44 has a cylindrical, rubber-elastic sealing element 46 that can be axially mounted on a blocking valve seat 48. The blocking valve seat 48 is formed on an inner axial end wall of the second housing part 11 as a tapered sealing lip 49 that projects axially towards the blocking valve body 44. Alternatively, the sealing lip 49 can also be arranged on or integrally formed with the blocking valve body 44. However, the blocking valve body 44 and the blocking valve seat 48 can also have other shapes.For example, the blocking valve seat 48 can have a conical shape similar to the control valve seat 62, while the blocking valve body 44 can have a curved, for example ellipsoidal, shape similar to the control valve body 34.

[0057] In the installed state, the flow channel 20 is thus closed by the control valve 22, as shown in Figure 2. This so-called initialization position is assumed at the beginning of a control operation, in which the actuator 50 is energized, whereby the magnetic field of the coil 52 acts on the ferromagnetic sleeve 39 and moves the valve body 30 axially towards the valve inlet 26. At the same time, the blocking valve body 44 is lifted from the blocking valve seat 48, so that the PI. P.24001.WO / EBFS 13.12.2024

[0058] - 13 -

[0059] Blocking valve 42 is open and the flow channel 20 on the outlet side of the valve body 30 is released.

[0060] In the control operation shown in Figure 3, the fluid volume flow rate in the flow channel 20 is determined. The control valve body 34 and the control valve seat 62 define a control cross-section 23 when the control valve body 34 is lifted from the control valve seat 62 during control operation. For this purpose, the control valve body 34 is moved in the flow direction S. During control operation, the valve body 30 can be continuously displaced in its axial position by means of a corresponding current applied to the actuator 50. This also displaces the control valve body 34, which is integrally formed with the valve body 30, in the axial direction, thus allowing the control cross-section 23 to be varied in area. Consequently, the control valve 22 is designed as a so-called proportional valve, which enables demand-based control of the fluid volume flow rate passing through the control cross-section 23.In this process, the movement of the control valve body 34 in the flow direction S leads to an enlargement of the control cross-section 23, which enables particularly precise control of the flow rate.

[0061] The valve stroke in control mode is designed such that the blocking valve body 44 does not contact the blocking valve seat 48, so that the blocking valve 42 is permanently open in control mode. Furthermore, the valve stroke in control mode is designed such that the flow cross-section formed between the blocking valve body 44 and the blocking valve seat 42 is always larger than the control cross-section 23, so that the control cross-section 23 is decisive for the flow rate in control mode. When the valve device 10 is switched off, the actuator 50 is de-energized, whereby the fluid flow on the inlet side against the valve body 30 displaces the valve body 30 in the flow direction S until the blocking valve body 44 contacts the blocking valve seat 48.

[0062] In this standby mode, shown in Figure 1, the actuator 50 is therefore not energized. The blocking valve body 44 is then placed onto the blocking valve seat 48, thereby closing the blocking valve 42 and blocking the flow channel 20. The blocking valve 42 is actuated solely by a [missing information - likely a reference to a specific component or device]. [The following appears to be unrelated and possibly a separate document:] PI. P.24001.WO / EBFS 13.12.2024

[0063] - 14 -

[0064] The valve inlet 26 is held in the closed position by a permanently applied pressure acting against the valve body 30 on the inlet side, whereby the blocking valve 42 can only be opened by means of the actuator 50. The blocking valve 42 thus blocks the flow channel 20 in the de-energized state and therefore represents a so-called fail-safe device that reliably closes the flow channel 20 in the event of a malfunction of the actuator 50.

[0065] Figure 5 shows a fuel cell system 100 with a valve device 10 as described in Figures 1-4. The fuel cell system 100 is intentionally not shown in its entirety, but only the components essential to the invention are shown. The fuel cell system 100 comprises a fuel cell unit 110 with an anode A and a cathode K. Furthermore, the fuel cell system comprises a hydrogen tank 120. The valve device 10 is fluidically arranged between the hydrogen tank 120 and the fuel cell unit 110 in a hydrogen supply path 130, wherein a pressure reducing device 140, for example a pressure relief valve 142, is arranged between the valve device 10 and the hydrogen tank 120. This pressure reducing device significantly reduces the high pressure of the hydrogen coming from the hydrogen tank 120 before it enters the valve device 10. The valve device 10 controls the amount of hydrogen supplied to the fuel cell unit 110.In the switched-off state, the valve device 10 is in standby mode, in which the flow channel 20 of the valve device 10 is blocked by the blocking valve 42, thereby closing the hydrogen supply path 130 upstream of the valve device 10. As soon as the fuel cell system 100 is switched on, the valve device 10 switches to control mode and supplies the fuel cell unit 110 with hydrogen from the hydrogen tank 120 as required.

[0066] The design of the valve device according to the invention is not limited to the embodiment described above. In particular, other forms are conceivable with regard to the design of the control valve 22 and the blocking valve 24. For example, the control valve body 34 and the blocking valve body 44 can be shaped differently than shown. Furthermore, the PI. P.24001 .WO / EBFS 13.12.2024

[0067] - 15 -

[0068] The control valve body 34 and the blocking valve body 44 may be identical. The shape of the two valve seats 48, 62 may also be identical and / or different from that shown.

Claims

PI. P.24001 .WO / EBFS 13.12.2024 - 16 - Patentanspriiche 1. Valve device (10) for a fuel cell system (100), comprising a valve housing (12) in which a flow channel (20) is arranged for unidirectional flow in an axial direction, fluidically connecting a valve inlet (26) with a valve outlet (28), wherein a control valve (22) is formed on the inlet side of the flow channel and a blocking valve (24) is formed on the outlet side, a single valve body (30) arranged in the flow channel (20), an electromagnetic actuator (50) by means of which the valve body (30) is movable in the axial direction in the flow channel (20), wherein the valve body (30) has a control valve body (34) at its first inlet-side axial end (32) which is associated with the control valve (22) and which interacts with a control valve seat (62), thereby defining a control cross-section (23),and wherein the valve body (30) has at its second outlet-side axial end (42) a blocking valve body (44) which is associated with the blocking valve (24) and which interacts with a blocking valve seat (48) whereby the flow channel (20) can be blocked or released.

2. Valve device (10) according to claim 1, wherein the control valve body (22) and the blocking valve body (24) are arranged coaxially to each other.

3. Valve device (10) according to one of the preceding claims, wherein the flow channel (20) is linear.

4. Valve device (10) according to one of the preceding claims, wherein the valve body (30) is formed from a plastic body (35) with a metallic casing (36). PI. P.24001.WO / EBFS 12 / 13 / 2024 - 17 - 5. Valve device (10) according to one of the preceding claims, wherein the valve body (30) is guided on a radial inner wall (21) of the flow channel (30).

6. Valve device (10) according to one of the preceding claims, wherein the valve body (30) is cylindrical.

7. Valve device (10) according to one of the preceding claims, wherein the valve body (30) has at least one fluid channel (38) which extends axially completely through the valve body (30).

8. Valve device (10) according to claim 7, wherein the fluid channel (38) is arranged eccentrically with respect to a central axis (M) of the valve body (10).

9. Valve device (10) according to one of the preceding claims, wherein the control valve body (34) and / or the blocking valve body (44) has a rubber-elastic sealing element (46).

10. Valve device (10) according to one of the preceding claims, wherein the control valve body (34) and / or the blocking valve body (44) is formed integrally with the valve body (30).

11. Fuel cell system (100) with a valve device (10) according to one of the preceding claims.

12. Fuel cell system (100) according to claim 11, wherein the valve device (10) is arranged fluidically between a fuel cell unit (110) and a hydrogen tank (120).

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