Fuel tank valve and method for operating a fuel tank valve

Abstract

The invention relates to fuel tank valve (1) for filling and / or emptying a pressure tank, having a tank interior (6) which contains fuel, and having a temperature sensor means (8) which is incorporated into the fuel tank valve (1) and projects into the tank interior, for sensing the temperature of the fuel in the tank interior, wherein the temperature sensor means is mounted on a valve housing body (10) and connected to an electrical conduction means (20), which comprises at least one elongate electrical conductor extending in a longitudinal direction through an elongate connecting duct (23) in the valve housing body, wherein the elongate electrical conductor is formed from an electrically conductive material different from the material from which the valve housing body is formed. To improve the fuel tank valve with regard to function and / or manufacture, the elongate electrical conductor is connected in at least one axial portion in a form-fitting manner to at least one expansion transfer body.

Description

[0001] Description

[0002] title

[0003] Fuel tank valve and method for operating a fuel tank valve

[0004] The invention relates to a fuel tank valve for filling and / or emptying a pressure tank having a tank interior containing fuel, and having a temperature sensor device that is integrated into the fuel tank valve and projects into the tank interior to detect the temperature of the fuel in the tank interior. The temperature sensor device is attached to a valve housing body and connected to an electrical conducting device that comprises at least one elongate electrical conductor that extends in a longitudinal direction through an elongate connecting channel in the valve housing body. The elongate electrical conductor is formed from an electrically conductive material that differs from the material from which the valve housing body is formed. The invention further relates to a method for operating such a fuel tank valve in a fuel cell system.

[0005] State of the art

[0006] German patent application DE 10 2020 201 172 A1 discloses a device for storing compressed gas, for example, hydrogen or natural gas, comprising a storage line to which at least one compressed gas container is connected, wherein a safety solenoid valve, also referred to as a shut-off valve, is integrated into the storage line. German patent application DE 10 2018 221 602 A1 discloses a tank device for storing a gaseous medium, in particular hydrogen, with a valve device and a tank, wherein the valve device comprises a valve housing with a movable control valve element. Disclosure of the Invention

[0007] The object of the invention is to improve a fuel tank valve according to the preamble of patent claim 1 functionally and / or in terms of manufacturing technology.

[0008] The object is achieved in a fuel tank valve for filling and / or emptying a pressure tank with a tank interior containing fuel, and with a temperature sensor device that is integrated into the fuel tank valve and projects into the tank interior to detect the temperature of the fuel in the tank interior, wherein the temperature sensor device is attached to a valve housing body and is connected to an electrical conducting device that comprises at least one elongate electrical conductor that extends in a longitudinal direction through an elongate connecting channel in the valve housing body, wherein the elongate electrical conductor is formed from an electrically conductive material that is different from the material from which the valve housing body is formed, in that the elongate electrical conductor is positively connected to at least one expansion transmission body in at least one axial section.The elongated electrical conductor is made, for example, from a stamped grid. The material from which the elongated electrical conductor is formed is preferably a bronze material. The elongated electrical conductor can have a rectangular cross-section. However, the elongated electrical conductor can also have a substantially round cross-section. The connecting channel can also have a rectangular or a substantially round cross-section. The at least one expansion transmission body has, for example, an outer cross-section that substantially corresponds to the inner cross-section of the connecting channel in the valve housing body.

[0009] Sufficient play must be provided in the connecting channel between the expansion transmission body and the valve housing body so that the expansion transmission body can expand unhindered in the valve housing body under the influence of temperature. The positive connection between the expansion transmission body and the elongated electrical conductor ensures that longitudinal forces are transmitted from the expansion transmission body to the conductor. The positive connection between the expansion transmission body and the elongated electrical conductor ensures that its longitudinal expansion approximately corresponds to that of the valve housing body. The term "longitudinal direction" refers to the longitudinal extent of the elongated electrical conductor. The elongated electrical conductor and the connecting channel in the valve housing extend in the same longitudinal direction.The electrical conduction device preferably comprises two electrical conductors, which preferably extend substantially parallel to one another through the connecting channel in the valve housing body. The two elongated electrical conductors are advantageously arranged coaxially in the connecting channel. In order to avoid unwanted short circuits between the electrical conductors and unwanted ground faults between the electrical conductors and the valve housing body, the electrical conductors are sufficiently spaced both from one another and from the valve housing body in the connecting channel. Maintenance of these distances is advantageously also ensured by the at least one expansion transmission body, in which the two electrical conductors are embedded together in the respective axial section, but sufficiently spaced from one another.The expansion transmission body is advantageously formed from a plastic material with which the elongated electrical conductor, preferably the two elongated electrical conductors, is or are overmolded in the respective axial section.

[0010] A preferred embodiment of the fuel tank valve is characterized in that the elongate electrical conductor has at least two cantilevers spaced apart in the longitudinal direction, which are embedded in the expansion transmission body. This ensures a stable, positive connection between the elongate electrical conductor and the expansion transmission body in a simple manner. The elongate electrical conductor preferably comprises at least two cantilevers extending from the elongate electrical conductor in opposite directions. Particularly advantageously, the elongate electrical conductor comprises two pairs, each with two cantilevers extending from the elongate electrical conductor in opposite directions, wherein the two pairs of cantilevers are spaced apart from one another in the axial direction.The expansion transmission body, for example, essentially has the shape of a right circular cylinder, which is arranged with play in a longitudinal bore which represents the connecting channel in the valve housing body.

[0011] A further preferred embodiment of the fuel tank valve is characterized in that the elongated electrical conductor is positively connected in at least two axial sections to an expansion transmission body, each of which is arranged with play in the connecting channel of the valve housing body. The size, number, shape, and material properties of the expansion transmission bodies allow the different expansions of the elongated electrical conductor(s) and the valve housing body to be very effectively coordinated and adjusted to one another. This makes it possible for no significant differences in the expansion of the elongated electrical conductor(s) and the valve housing body to occur, particularly even during significant temperature fluctuations.

[0012] A further preferred embodiment of the fuel tank valve is characterized in that the elongated electrical conductor has a clearance section between two expansion transmission bodies, in which the elongated electrical conductor is arranged in the connecting channel at a sufficient insulating distance from the valve housing body. If two elongated electrical conductors extend through the two expansion transmission bodies, then they are also arranged at a sufficient insulating distance relative to one another. The clearance section between the two expansion transmission bodies advantageously prevents the expansion transmission bodies from undesirably heating up when in contact with the valve housing body. However, the clearance section has a smaller axial dimension than the expansion transmission bodies.This ensures that the expansion transfer bodies perform their desired expansion transfer function from the valve housing body to the elongated electrical conductor to the desired extent.

[0013] A further preferred embodiment of the fuel tank valve is characterized in that an end of the elongated electrical conductor facing the tank interior is positively connected to a retaining body, which is non-positively connected in the connecting channel and additionally positively connected to the valve housing body such that the retaining body cannot move further into the connecting channel. The retaining body creates a kind of fixed bearing for the end of the elongated electrical conductor facing the tank interior. This ensures that an electrical connection of the elongated electrical conductor to the temperature sensor device is stably fixed even at varying temperatures in the tank interior.

[0014] A further preferred embodiment of the fuel tank valve is characterized in that an end of the elongated electrical conductor facing away from the tank interior is electrically connected to a connecting line by a plug connection. The connecting line serves, for example, to connect the elongated electrical conductor arranged in the connecting channel to a connector located outside the pressure tank. The plug connection creates a type of floating bearing, which simplifies the manufacture of the fuel tank valve, in particular the connection of the temperature sensor device integrated into the fuel tank valve to the connector attached to the outside of the valve housing.The claimed combination of the electrical conducting device with the at least one expansion transmission body, preferably with a plurality of expansion transmission bodies, ensures that the electrical contact in the plug connection between the elongated electrical conductors and the connecting lines is not impaired by different expansions under the influence of temperature.

[0015] A further preferred embodiment of the fuel tank valve is characterized in that the elongated electrical conductor and the expansion transmission body(s) are selected and designed in terms of their cross-sections, elastic moduli, and thermal expansion coefficients, as well as their number, shape, and size, such that the elongated electrical conductor, at different operating temperatures, expands in its longitudinal direction in a manner that does not impair the function of the valve housing body or the plug connection at its end facing away from the tank interior. "Non-impairing" means, in particular, that the elongated electrical conductor may expand differently than the valve housing body within a permissible tolerance range, but without thereby impairing the function of the plug connection.The different strains under the influence of temperature can alternatively be represented using a spring model and calculated using a corresponding strain equation. The calculation can be verified, for example, using a finite element method.

[0016] A further preferred embodiment of the fuel tank valve is characterized in that the elongated electrical conductor is formed from a bronze material, the valve housing body is formed from an aluminum material, and the expansion transmission body(s) is / are formed from a plastic material. The bronze material is preferably an alloy containing copper and tin. The aluminum material is preferably also an alloy containing aluminum and magnesium. The plastic material is preferably a thermoplastic material, in particular a polyester, such as polybutylene terephthalate. These materials have proven particularly advantageous in this combination for the claimed application.

[0017] In a method for operating a previously described fuel tank valve in a fuel cell system at significantly different operating temperatures, the above-mentioned object is achieved alternatively or additionally by the elongated electrical conductor expanding in its longitudinal direction at the significantly different operating temperatures within a permissible tolerance range in the same or similar manner as the valve housing body. The same or similar expansion is ensured by the expansion transmission body(s).

[0018] The invention also relates, if appropriate, to a fuel cell system having at least one pressure tank equipped with at least one fuel tank valve as described above. The invention further relates to an expansion transmission body, an elongated electrical conductor, and / or a valve housing body for a fuel tank valve as described above. These parts are sold separately.

[0019] Further advantages, features and details of the invention will become apparent from the following description, in which various embodiments are described in detail with reference to the drawing.

[0020] Short description of the drawing

[0021] They show:

[0022] Figure 1 is a perspective longitudinal sectional view of a fuel tank valve with an integrated temperature sensor device;

[0023] Figure 2 is an enlarged view of a contact area from Figure 1;

[0024] Figure 3 is a perspective view of the contact area of ​​Figure 2 with only one elongated electrical conductor;

[0025] Figure 4 is an enlarged view of an electrical connection between the temperature sensor device and an electrical conducting device comprising two elongated electrical conductors;

[0026] Figure 5 shows an enlarged section of Figure 4 with only one elongated electrical conductor;

[0027] Figure 6 is a schematic representation of a conventional fuel cell system as disclosed in German patent application DE 10 2020 208 038 A1;

[0028] Figure 7 is an enlarged view of a line section from Figure 1 with an elongated electrical conductor; Figure 8 is an enlarged view of a section from Figure 7 to illustrate a mathematical determination of the various strains in the longitudinal direction under the influence of temperature; and

[0029] Figure 9 shows a substitute model for the different strains under temperature influence with four springs.

[0030] Description of the embodiments

[0031] Figure 6 shows a schematic representation of a conventional fuel cell system 101. The fuel cell system 101 includes an anode path 104, which connects a hydrogen tank 128 to an anode 112 of a fuel cell stack 120. At least two valves 132, 134 are arranged within the anode path 104.

[0032] The first valve 132 is designed as a shut-off valve. The shut-off valve 132 is open during operation of the fuel cell system 101. When the fuel cell system 101 is shut down, the shut-off valve 132 is closed, so that no more hydrogen can flow from the hydrogen tank 128 to the anode 112.

[0033] The second valve 134 is designed as an HGI valve 134 and can meter the amount of hydrogen required by the fuel cell stack 120 to the anode 112 depending on the respective operating state.

[0034] A connecting line 108 is arranged between the first valve 132 and the second valve 134. Located in the connecting line 108 is a sensor 110, which can determine the pressure within the connecting line 108.

[0035] In the hydrogen tank 128, the hydrogen is usually stored at high pressure. To reduce the pressure, a pressure control valve 130 can be located between the hydrogen tank 128 and the first valve 132, which reduces the pressure before the hydrogen flows to the HGI valve 134 or the anode 112. The pressure at the inlet of the first valve 132, which corresponds to the tank pressure or has been reduced by the pressure control valve 130, is called the supply pressure.

[0036] The fuel cell system 101 further comprises a cathode gas supply line 115, which supplies a cathode 116 of the fuel cell stack 120 with air, and a cathode gas discharge line 117, which discharges the used air and exhaust gases from the fuel cell stack 120.

[0037] During operation of the fuel cell system 101, hydrogen is delivered to the anode path 104 via the hydrogen tank 128, the first valve 132, and the second valve 134 to the anode 112. Since the hydrogen is supplied to the anode 112 at a superstoichiometric rate for performance and component protection reasons, the unused hydrogen is returned via an anode gas return line 114 and reintroduced into the anode path 104 at a hydrogen return point 122.

[0038] A recirculation pump 142, as well as other valves and components, can be arranged within the anode gas return line 114.

[0039] Because nitrogen diffuses from the cathode 116 to the anode 112 during the fuel cell reaction and accumulates with increasing proportion within the anode path 104 via the anode gas return line 114, the nitrogen accumulated within the anode path 104 must be removed from the fuel cell system 101 from time to time.

[0040] In the present case, this can be accomplished via a purge valve 141 arranged in the anode gas return line 114. To drain excess water from the anode 112 or the anode path 104, a water separator, a water reservoir, and a drain valve can also be arranged within the anode gas return line 114; these are not explicitly shown in the drawings because they are not essential to the invention. The fuel cell system 101 has a measuring arrangement for checking at least one valve 132, 134. The measuring arrangement comprises a sensor 110 for acquiring measured values ​​to determine a current pressure at a position within the connecting line 108 of the anode path 104. In an alternative embodiment, the sensor 110 can additionally also detect the current temperature of the gas at this position.

[0041] A control unit 111 is connected to the sensor 110 by cable or wirelessly in order to record measured values, in particular pressure values ​​and / or temperature values, and to evaluate them according to the method according to the invention in order to check whether there is a leak in the first valve (shut-off valve) 132 or the second valve (HGI valve) 134.

[0042] The control unit 111 is also connected to other components of the fuel cell system 101. The control unit 111 can also have a connection to the first valve 132 and / or the second valve 134 in order to detect the time of opening and closing of the first valve 132 and the second valve 134 and to incorporate this information into the calculation of a leakage rate.

[0043] Figure 1 shows a perspective view of a fuel tank valve 1 in longitudinal section. The fuel tank valve 1 is, for example, a pressure control valve, such as that associated with the hydrogen tank 128 in the fuel cell system 101 shown in Figure 6. Since the hydrogen in the hydrogen tank 128 can be subjected to high pressures, for example, up to 700 bar, the hydrogen tank 128 can also be referred to as a pressure tank 128.

[0044] If the fuel tank valve 1 is used in a fuel cell system that uses hydrogen as fuel, the fuel tank valve 1 can also be referred to as a hydrogen tank valve 1. The fuel tank valve 1 is also referred to as a tank valve for short. Hydrogen can be withdrawn from the pressure tank via the fuel tank valve 1. For this purpose, the fuel tank valve 1 has, for example, two fluid connections 2, 3. Depending on the design, the pressure tank can also be filled with fuel, in particular hydrogen, via the hydrogen tank valve or fuel tank valve 1. For this purpose, the hydrogen tank valve 1 can also be equipped with an additional fluid connection.

[0045] The fuel tank valve 1 advantageously comprises several valves. The valves combined in the fuel tank valve 1 are, for example, a manually operated valve through which the pressure tank can be emptied. Furthermore, a vent valve can be integrated into the fuel tank valve 1. The pressure control valve is designed, for example, as a shut-off valve. The shut-off valve is actuated electromagnetically.

[0046] Furthermore, at least one sensor device is advantageously integrated into the fuel tank valve 1. The sensor device can be a pressure sensor. Furthermore, at least one temperature sensor device 8 is integrated into the fuel tank valve 1. The temperature sensor device 8 projects with a sensor body 16 into a tank interior 6 of the pressure tank. Furthermore, an ejector 5 projects into the tank interior 6 of the pressure tank.

[0047] The fuel tank valve 1 is equipped with an electrical connection 4. Electrical and / or electronic devices in the fuel tank valve 1, such as a solenoid assembly of the pressure control valve or the temperature sensor device 8, can be electrically supplied and / or electronically controlled via the electrical connection 4, which is equipped with a connector plug 7.

[0048] The fuel tank valve 1 comprises a valve housing body 10 made of aluminum material. A connecting channel 23 is provided in the valve housing body 10 for electrically contacting the temperature sensor device 8. In the illustrated embodiment, the connecting channel 23 is designed as a bore with a circular cross-section. The connecting channel 23 has a longitudinal axis that coincides with a longitudinal axis of the temperature sensor device 8 and extends in a vertical direction in Figure 1.

[0049] At an upper end in Figure 1, a contact area 9 for an electrical conducting device 20 is arranged. The contact area 9 serves to represent an electrical connection of the electrical conducting device 20 to the connection plug 7. At a lower end in Figure 1, the electrical conducting device 20 is electrically connected to the temperature sensor device 8 in a contact area 24.

[0050] In Figure 2 it can be seen that in the contact area 9 two conductors 21, 22 of the electrical conduction device 20 are plugged into contact forks 17, 18 which are formed at the lower ends in Figure 2 of two connecting conductors 27, 28. The connecting conductors 27, 28 serve for the electrical connection to the connection plug 7. The contact forks 17, 18 represent plug connections 12, 13 which represent a type of loose bearing for the two electrical conductors 21, 22 of the electrical conduction device 20. To accommodate the plug connections 12, 13, the connecting channel 23 has a recess 19 with an enlarged diameter at its upper end shown in Figure 2.

[0051] The perspective sectional view in Figure 3 shows that both the conductor 22 and the connecting conductor 28 with the contact fork 18 have essentially rectangular cross-sections. The conductors 21, 22 and the connecting conductors 27, 28 are made of a highly electrically conductive bronze material.

[0052] In Figure 4, the contact area 24 is shown enlarged in longitudinal section. In the contact area 24, the two conductors 21, 22 of the electrical conduction device 20 are connected to sensor wires 51, 52. The electrical connection is established, for example, with two positive and material-locking connections 53, 54. The temperature sensor device 8 comprises a sensor housing body 55, which is firmly connected to the valve body 10 with the interposition of a sealing device 56. Due to the positive and material-locking connections 53, 54, the contact area 24 represents a type of fixed bearing for the electrical conduction device 20. In Figure 4, one can see that the sensor housing body 55 is located with a shoulder 57 on a shoulder 11 of the

[0053] Valve housing body 10 supports

[0054] Figure 5 shows that the positive and material-locking connection 54 between the sensor wire 52 and the conductor 22 is arranged in a holding body 30. The holding body 30 is formed from a plastic material. The positive and material-locking connection 53 is, for example, overmolded with the plastic material from which the holding body 30 is formed. The holding body 30 is pressed into the connecting channel 23 and is additionally secured in the axial direction by a shoulder 58 in the connecting channel 23 of the valve housing body 10. This ensures that the holding body 30 cannot move upward in the connecting channel 23 in Figure 5.

[0055] Figure 7 shows a line section 14 with the electrical conductor 22 of the electrical conduction device 20 from Figure 1 alone in longitudinal section. At different temperatures, the conductor 22 made of bronze material in the line section 14 between the fixed bearing-like contact area 24 and the loose bearing-like contact area 9 expands differently than the valve housing body 10 formed from the aluminum material. In order to prevent these different expansions in the longitudinal direction of the conductor 22, which are undesirable with regard to the electrical contacts in the contact areas 9 and 24, the conductor 22 is embedded in seven axial sections in seven expansion transmission bodies 31 to 37. The number seven refers to the illustrated embodiment. Depending on the design, the use of more than seven or fewer expansion transmission bodies may be expedient.

[0056] The expansion transmission bodies 31 to 37 are formed from a plastic material with which the conductor 22 is overmolded in the relevant axial sections. For better anchoring of the conductor 22 in the expansion transmission bodies 31 to 37, the conductor 22 has four outriggers 25, 26; 65, 66 for each expansion transmission body 31 to 37. The outriggers 25, 26; 65, 66 are each arranged in pairs and angled in opposite directions from the conductor 22. Figure 7 shows that between two expansion transmission bodies 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37 each have a play section 41 to 46 in which the conductor 22 is not overmolded with plastic material

[0057] Figures 8 and 9 illustrate how the thermal expansion of the conductor 22 can be approximately equalized to the thermal expansion of the valve body 10 through the multiple partial overmolding with the expansion transmission bodies 31 to 37. A double arrow 61 indicates a diameter of the expansion transmission body 31, with which the expansion transmission body 31 is arranged with play in the connecting channel 23. A double arrow 62 indicates an expansion length between the arms 25, 26 and 65, 66 in the expansion transmission body 31. A double arrow 63 illustrates the total length of the line section 14.

[0058] Figure 9 illustrates an equivalent diagram of thermal expansion in the form of a spring model with four springs 71, 72, 73, and 74. Spring 71 represents the valve housing body 10. An arrow 75 illustrates the expansion of the valve housing body 10. Spring 72 represents the conductor 22 made of bronze material. Spring 73 represents the expansion transmission body 31 made of plastic material. Spring 74 represents a clearance section between two expansion transmission bodies.

[0059] The properties of stiffness and coefficient of linear expansion are combined in springs 71 to 74. Spring 72, which represents the bronze conductor, and spring 73, which represents the plastic expansion transfer body, are connected in parallel. An arrow 76 indicates the joint expansion of this parallel connection from 72 to 73. An arrow 77 indicates the expansion of spring 74, which represents the play section and is connected in series with the parallel connection of 72 and 73.

[0060] Dimension arrows 78 and 79 illustrate a strain difference, namely a strain difference between the strain 75 of the

[0061] Valve housing body 10 minus the strains illustrated by arrows 76 and 77 in Figure 9. The guide element strain of the axial sections of the conductor overmolded with the strain transmission bodies can be calculated and verified, for example, using a finite element method.

Claims

Claims 1. A fuel tank valve (1) for filling and / or emptying a pressure tank (128) having a tank interior (6) containing fuel, and having a temperature sensor device (8) which is integrated into the fuel tank valve (1) and projects into the tank interior (6) in order to detect the temperature of the fuel in the tank interior (6), wherein the temperature sensor device (8) is attached to a valve housing body (10) and is connected to an electrical conducting device (20) which comprises at least one elongate electrical conductor (21, 22) which extends in a longitudinal direction through an elongate connecting channel (23) in the valve housing body (10), wherein the elongate electrical conductor (21, 22) is formed from an electrically conductive material which is different from the material from which the valve housing body (10) is formed, characterized in that the elongate electrical conductor (21,22) is positively connected in at least one axial section to at least one expansion transmission body (31-37).

2. Fuel tank valve according to claim 1, characterized in that the elongated electrical conductor (21, 22) has at least two arms (25, 26) spaced apart from one another in the longitudinal direction, which are embedded in the expansion transmission body (31 - 37).

3. Fuel tank valve according to one of the preceding claims, characterized in that the elongated electrical conductor (21, 22) is positively connected in at least two axial sections to a respective expansion transmission body (31-37) which is arranged with play in the connecting channel (23) of the valve housing body (10).

4. Fuel tank valve according to one of the preceding claims, characterized in that the elongated electrical conductor (21, 22) has a play section (41-46) between two expansion transmission bodies (31-37), in which the elongated electrical conductor (21, 22) in the connecting channel (23) is arranged at a sufficient insulating distance from the valve housing body (10).

5. Fuel tank valve according to one of the preceding claims, characterized in that an end of the elongated electrical conductor (21, 22) facing the tank interior (6) is positively connected to a holding body (30) which is non-positively and additionally positively connected to the valve housing body (10) in the connecting channel (23) in such a way that the holding body (30) cannot move further into the connecting channel (23).

6. Fuel tank valve according to one of the preceding claims, characterized in that an end of the elongated electrical conductor (21, 22) facing away from the tank interior (6) is electrically connected to a connecting line (27, 28) by a plug connection (12).

7. Fuel tank valve according to claim 6, characterized in that the elongated electrical conductor (21, 22) and the expansion transmission body / the expansion transmission bodies (31-37) are selected and designed in terms of their cross sections, elastic moduli and temperature expansion coefficients as well as their number, shape and size such that the elongated electrical conductor (21, 22) does not expand in its longitudinal direction at different operating temperatures any differently than the valve housing body (10) or the plug connection (12) at its end facing away from the tank interior (6) in a way that does not impair its function.

8. Fuel tank valve according to one of the preceding claims, characterized in that the elongated electrical conductor (21, 22) is formed from a bronze material, the valve housing body (10) is formed from an aluminum material, the expansion transmission body(s) (31 - 37) being formed from a plastic material.

9. Method for operating a fuel tank valve (1) in a fuel cell system (101) at significantly different operating temperatures, characterized in that the elongated electrical conductor (21, 22) at the significantly different Operating temperatures within a permissible tolerance range in its longitudinal direction in the same way or similar to how the valve housing body (10) expands.

10. Expansion transmission body (31-37), elongated electrical conductor (21, 22) and / or valve housing body (10) for a fuel cell valve (1) according to one of claims 1 to 8.

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