JP2011064245A - Gas shutoff valve for fuel cell - Google Patents

Abstract

To provide a fuel cell gas shut-off valve at a low cost that minimizes the thrust required when the valve is opened.
A fuel cell gas shut-off valve 10 includes a valve body 20 that abuts a valve seat 53 and shuts off a reaction gas, and an actuator 60 that switches a gas flow state. Compared with the main flow path 31, the main valve 21 that shuts off the main flow path 31 through which the reaction gas flows between the primary flow path 33 and the secondary flow path 34 formed via the valve body 20 in contact with the main flow path 31. A sub-valve 41 having a small channel diameter, blocking the sub-channel through which the reaction gas flows between the primary-side channel 33 and the secondary-side channel 34, and having a small diameter with respect to the main valve 21, and the main channel 31 And a valve rod 40 that switches the gas flow state of the auxiliary flow path by an actuator 60.
[Selection] Figure 1

Description

  The present invention relates to a gas cutoff valve for a fuel cell that switches a gas flow state.

  In the conventional gas shutoff valve for a fuel cell in which the secondary flow path has a negative pressure, a valve hole is formed to connect the primary flow path and the secondary flow path, and the valve hole communicates with the secondary flow path. A first valve body that controls the reaction gas by contacting or separating the first valve body from a first valve seat provided in the opening, and the first valve body from the secondary side flow path to the primary side flow path And a first drive part that drives the first valve body, and a technique that can operate even when the differential pressure between the primary side flow path and the secondary side flow path is large is known. (For example, refer to Patent Document 1).

  In addition, a movable member that is displaceable along the axial direction under the excitation action of the solenoid part is provided inside the valve provided in the reaction gas introduction / derivation part of the stack, and the pilot valve is moved from the pilot valve seat under the displacement action. And the main valve of the valve body by the pressure difference between the first communication chamber and the second communication chamber divided by the diaphragm, in which the fluid in the communication chamber flows to the outlet port through the pilot passage. Is known to be opened from the valve seat of the valve body (see, for example, Patent Document 2).

JP 2004-263756 A JP 2006-153222 A

  However, in the conventional technology, when the stack introduction / extraction flow path is shut off by a valve or the like after the power generation is stopped, the inside of the stack becomes a negative pressure environment due to consumption of the reaction gas contained in the stack or a temperature drop. . In order to supply the reaction gas to the stack in this negative pressure environment, a large valve opening force that opposes the suction force due to the negative pressure is required.

  In Patent Document 1, it is possible to operate even under a large differential pressure condition by providing a plurality of valve drive units, but there is a problem that the structure becomes large and the cost is high.

  In Patent Document 2, it is necessary to make the thrust of an actuator such as a solenoid, a motor, or a diaphragm larger than the suction force due to negative pressure, and there is a problem that the structure becomes large and the cost is increased as in Patent Document 1.

  An object of the present invention is to solve the problem of such a conventional configuration, and to provide a low-cost fuel cell gas shut-off valve that minimizes the thrust required when the valve is opened. To do.

  A first solution taken in order to solve the above-mentioned problem is a gas shut-off valve for a fuel cell comprising a valve body that abuts against a valve seat and shuts off a reaction gas, and an actuator that switches a gas flow state. The valve body has a main valve that blocks the main flow path through which the reaction gas flows between the primary flow path and the secondary flow path, and a flow path diameter that is smaller than the main flow path, and the primary flow path. And a secondary flow path through which the reaction gas flows between the secondary flow path and a secondary valve having a small diameter with respect to the main valve, and a gas flow state of the primary flow path and the secondary flow path A gas shut-off valve for a fuel cell, comprising a valve rod that is switched by the actuator.

  Further, the second solution means that the main valve abuts the valve seat, the main seal portion that seals the main passage, and the sub passage when the main valve and the sub valve abut. A secondary seal portion for sealing, and the main seal portion and the secondary seal portion are integrally formed of a rubber or resin elastic gasket.

  A third solving means is that the main valve includes a flat sizing contact portion at an inner edge of the sub seal portion.

  A fourth solution is that the sub-flow path is formed between the inner wall surface of the main valve and the valve stem.

  Further, the fifth solving means is that the valve rod includes the sub valve and a separating flange portion that separates the main valve from the valve seat, and the valve is disposed at an interval between the auxiliary valve and the separating flange portion. The rod is provided to be movable relative to the main valve.

  According to the present invention, the valve body shuts off the main flow path with the main valve, the sub flow path with the sub valve having a small diameter relative to the main valve, and the gas flow state between the main flow path and the sub flow path with the actuator. And a switching valve stem. For this reason, the valve stem opens the sub-valve with a small thrust with a small thrust, and causes the reaction gas to flow through the sub-channel. After the reaction gas flows in the sub flow path, the differential pressure between the primary flow path and the secondary flow path generated while the main flow path is blocked by the main valve is reduced. By this action, the suction force received by the main valve is reduced, so that the valve body can be easily opened.

  In addition, the thrust required by the actuator when the valve is opened is sufficient for the thrust that opens the sub-valve. Therefore, the thrust is kept to a minimum compared to the structure of the main valve only in the prior art. Can be opened, and the size of the actuator can be reduced. Further, for example, even when it is necessary to increase the opening area of the stack manifold, since the influence of the increase in the pressure receiving area of the valve body is small, a small actuator can be used regardless of the opening area of the stack manifold.

  The main valve is provided with a main seal portion that contacts and seals the valve seat, and a sub seal portion that seals when the main valve and the sub valve contact each other, and the main seal portion and the sub seal portion are made of rubber or It is integrally molded with a resin elastic gasket. From this, when the main seal portion and the sub seal portion come into contact with the valve seat and the sub valve, respectively, high sealing performance is obtained by elastic deformation of rubber or resin. Further, since the main seal portion and the sub seal portion are integrally formed in the gasket, the cost can be reduced in the manufacturing process.

  Moreover, since the main valve includes a sub seal at a position where the main valve and the sub valve abut, and includes a flat sizing contact portion on the inner edge of the sub seal portion, when the sub seal portion is abutted by the sub valve, Since the crushing margin of the sub seal portion can be managed, the durability of the sub seal portion can be improved. In addition, by providing a flat sizing contact portion, the force can be directly transmitted from the sub valve to the main valve, and the load on the main seal portion can be easily managed.

  Further, since the auxiliary flow path is formed between the inner wall surface of the main valve and the valve stem, the auxiliary flow path can be easily provided without requiring a complicated structure in the valve body. In addition, since the sub-channel has a smaller channel diameter than the main channel, it is possible to reduce the valve opening sound that is generated when the valve is opened.

  In addition, the valve stem includes a sub-valve and a pull-off flange portion that separates the main valve from the valve seat, and the valve rod is movable relative to the main valve in the interval between the sub-valve and the pull-off flange portion. The main valve can be opened after the auxiliary valve is opened first and the reaction gas is passed through the auxiliary flow path. Moreover, the valve opening time of a subvalve can be adjusted by adjusting the space | interval of a subvalve and a separation collar part.

It is front sectional drawing at the time of the main valve opening of the gas cutoff valve for fuel cells in 1st Example. It is front sectional drawing at the time of the subvalve opening of the gas cutoff valve for fuel cells in 1st Example. It is front sectional drawing at the time of the valve closing of the main valve of the gas cutoff valve for fuel cells in 1st Example, and a subvalve. It is CC sectional drawing of the main valve which showed how to provide the subflow path in 1st Example. It is front sectional drawing of the valve body which showed the shape of the pulling-off flange part of the valve stem in 1st Example. It is front sectional drawing at the time of sub valve opening of the gas cutoff valve for fuel cells in 2nd Example.

  A first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a front sectional view of the fuel cell gas shut-off valve 10 in the first embodiment when the main valve 21 is opened. The fuel cell gas shut-off valve 10 includes a body 50 formed by connecting a first body 50a, a second body 50b, and a partition wall 50c, and a primary flow path 33 and a secondary flow path 34 in the body 50. A valve seat 53 formed on the inner wall of the first body 50a and a valve body 20 that shuts off when the main valve 21 abuts the reaction gas flowing between them.

  The valve element 20 has a main valve 21 that blocks the main flow path 31 through which the reaction gas flows between the primary flow path 33 and the secondary flow path 34, and has a smaller flow path diameter than the main flow path 31. The main flow path is operated in the vertical direction (A-B direction) by the sub valve 41 that shuts off the sub flow path 32 (FIG. 2) through which the reaction gas flows between the flow path 33 and the secondary flow path 34 and the actuator 60. 31 and a valve rod 40 for switching the reaction gas flow state of the sub-channel 32.

  The main valve 21 abuts on the valve seat 53 and circulates in the sub-channel 32 when the main valve 21 and the sub-valve 41 abut on the main seal portion 22 that blocks the reaction gas that circulates in the main channel 31. And a sub seal portion 23 for blocking the reaction gas. The main seal portion 22 and the sub seal portion 23 are integrally formed by an elastic gasket 24 such as rubber or resin. The gasket 24 may be made of a rubber or thermoplastic resin that has a sealing property and is durable, and for example, EPDM or FKM can be used. Further, the main valve 21 has a flat sizing contact portion 25 on the inner edge of the sub seal portion 23 in order to manage the crushing margin of the sub seal portion 23 when the sub seal portion 23 is brought into contact with the sub valve 41. .

  The valve stem 40 is inserted through a valve stem insertion hole 51 that penetrates in the thickness direction of the partition wall 50c. As shown in FIG. 1, one end of the valve stem 40 comes into contact with one side surface (the surface on the B direction side in the second embodiment) of the main valve 21 when the valve stem 40 is moved in the A direction. A pull-off flange portion 42 for separating the valve 21 from the valve seat 53 and the other side surface of the main valve 21 (the surface on the A direction side in the second embodiment) when the valve rod 40 is moved in the B direction, A sub-valve 41 that presses the valve 21 against the valve seat 53 is provided. On the other end side of the valve stem 40, a space surrounded by the spring mounting portion 63, the first body 50a, the second body 50b, and the partition wall 50c is divided to provide a valve closing pressure receiving chamber 54 and a valve opening pressure receiving chamber 55. A rubber or resin diaphragm 62 is formed. Between the spring attachment portion 63 and the diaphragm attachment portion 43, an urging spring 61 that urges the diaphragm attachment portion 43 in a direction (a direction in which the diaphragm attachment portion 43 is pushed) to be separated from the spring attachment portion 63 is provided. The outer end 62 p of the diaphragm 62 is held by the body 50. That is, the outer end 62p of the diaphragm 62 is held by being sandwiched between the first body 50a and the second body 50b of the body 50. An inner end 62 i of the diaphragm 62 is held on the valve stem 40 by a diaphragm mounting portion 43. The valve closing pressure receiving chamber 54 and the valve opening pressure receiving chamber 55 are connected to ports 54a and 55a for applying gas pressure, respectively.

  The actuator 60 is a driving device for translating the valve rod 40 in the vertical direction, and the pressures in the two chambers (the valve-closing pressure receiving chamber 54 and the valve-opening pressure receiving chamber 55 in the first embodiment) separated by the diaphragm 62. A system driven by the difference is used. In the first embodiment, a diaphragm 62 is provided as the actuator 60 and the valve rod 40 is operated so as to move in the vertical direction. However, the actuator 60 moves the valve rod 40 in the vertical direction by a motor instead of the diaphragm 62. It is also possible to operate as follows. Further, between the inner wall surface of the valve rod insertion hole 51 and the outer peripheral surface of the valve rod 40, the reaction gas flowing from the primary-side flow path 33 and the gas or liquid supplied to the valve-opening pressure receiving chamber 55 are prevented. A sealing member 52 is interposed.

  FIG. 2 is a front sectional view of the fuel cell gas shut-off valve 10 according to the first embodiment with the auxiliary valve 41 opened. In this state, the distance between the sub valve 41 and the separating collar portion 42 is formed larger than the thickness of the main valve 21 so that the reaction gas flows only through the sub flow path 32. The valve stem 40 is configured to have a pressure receiving area smaller than that of the main valve 21 so that the auxiliary valve 41 can be easily opened.

  By opening only the sub-valve 41, the suction force on the side of the secondary side flow path 34 generated by the differential pressure between the primary side flow path 33 and the secondary side flow path 34 is released. Further, the time during which the reaction gas flows only through the sub-channel 32 depends on the distance between the sub-valve 41 and the flange portion 42 and the driving speed of the actuator 60 (or the magnitude of the pressure acting on the valve-opening pressure receiving chamber 55). .

  Here, in this embodiment, the secondary flow path 32 is interlocked with the movement of the valve rod 40 in order to easily reduce the differential pressure between the primary flow path 33 and the secondary flow path 34 generated in the first body 50a. Then, it is formed between the inner wall surface of the main valve 21 and the valve stem 40 so that the reaction gas flows through the sub-flow path 32, but a hole is formed in a part of the main valve 21 to block the hole. The same effect can be achieved with a structure provided with a valve.

  FIG. 3 is a front sectional view of the fuel cell gas cutoff valve 10 according to the first embodiment with the main valve 21 and the subvalve 41 closed. The main seal portion 22 and the sub seal portion 23 formed of an elastic body made of rubber or resin are tightly deformed and sealed to the valve seat 53 and the sub valve 41 by the operation of the actuator 60, respectively. When the auxiliary valve 41 is closed, the auxiliary seal 23 is secured by the fixed contact portion 25. The fixed-size contact portion 25 is formed in substantially the same circular shape with respect to the center of the main valve 21, and uniformly applies a load to the entire main seal portion 22 when pressed in the B direction by the sub valve 41.

  The valve rod 40 is urged in the direction of the secondary flow path 34 (direction B) by the urging spring 61 even when the actuator 60 is not in operation. As shown in FIG. It is comprised so that 41 may be in a valve closing state. The urging spring 61 of the first embodiment is a pushing spring that urges the diaphragm mounting portion 43 of the valve rod 40 in the pushing direction, but is attached to the partition wall 50c side and pulls the diaphragm mounting portion 43 of the valve rod 40. A tension spring that biases in the direction may be used.

  FIG. 4 is a cross-sectional view of the main valve 21 taken along the line C-C showing the form of the auxiliary flow path 32 in the first embodiment. (A) is a form of 1st Example, and is the case where the subflow path 32 is provided in the inner wall face of the main valve 21. FIG. A recess provided in a part of the inner wall surface of the main valve 21 is formed as the sub-flow channel 32. The size of the recess is smaller than the main valve 21 in order to reduce the pressure that the reaction gas flows in the sub-flow path 32 and the sub-valve 41 receives. The shape of the recess is formed so as to have a semicircular cross section, but the same effect can be obtained even if it is square. (B) And (c) is a modification of the subchannel 32 of (a). (B) When the auxiliary flow path 32 is provided in the valve stem 40, a recess provided in a part of the outer wall surface of the valve stem 40 is formed as the auxiliary flow path 32. (C) When the auxiliary flow path 32 is formed by providing a wide space between the valve stem 40 and the main valve 21, a gap between the valve stem 40 and the main valve 21 is formed as the auxiliary flow path 32. Here, the method of providing the sub-channels 32 of (a) and (b) is not limited to providing one or a plurality of sub-channels 32. Further, in (c), the size of the hole of the auxiliary flow path 32 should not exceed the diameter of the auxiliary valve 41.

  FIG. 5 is a front cross-sectional view of the valve body 20 showing the shape of the separating collar portion 42 of the valve stem 40 in the first embodiment. (A) is the drawer brim part 42 of 1st Example. (B) and (c) are modified examples of (a), and the pull-out brim portion 42 may be configured to be (b) cut on the side of the auxiliary flow path 32 and (c) processed into a trapezoid. At the time of opening the valve, if the sub-flow channel 32 is blocked by the pull-out flange portion 42 without reducing the differential pressure between the primary flow channel 33 and the secondary flow channel 34 generated in the first body 50a, the differential pressure There is a possibility that the efficiency of the reduction may be reduced, and the problem of blocking the sub-flow channel 32 can be solved with the pull-out flange portion 42 having the shape as shown in (b) and (c).

  The operation of the first embodiment will be described below.

  First, in the above configuration, the fuel cell gas shut-off valve 10 is opened from the closed state shown in FIG. 3 to the opened state shown in FIG. 1 through the intermediate state in which the auxiliary valve 41 shown in FIG. 2 is opened. The case where it changes to is demonstrated. In the valve closed state (FIG. 3), the secondary side flow path 34 side becomes a negative pressure environment due to the differential pressure between the primary side flow path 33 and the secondary side flow path 34 in the first body 50a. Suction is in the B direction.

  The valve rod 40 is moved in the direction A by the operation of the actuator 60 from the closed state of the valve body 20 (FIG. 3) to open the auxiliary valve 41 (FIG. 2). At this time, gas is allowed to flow from the port 55 a into the valve-opening pressure receiving chamber 55, and the pressure in the valve-opening pressure-receiving chamber 55 is made higher than that in the valve-closing pressure receiving chamber 54. In order to alleviate this pressure difference, the diaphragm 62 rises in the A direction. In parallel with the operation of the diaphragm 62, the diaphragm mounting portion 43 and the valve rod 40 move in the A direction, and the sub valve 41 is separated from the main valve 21.

  While the sub-valve 41 is in the open state, the reaction gas flows through the sub-channel 32, so that the differential pressure between the primary channel 33 and the secondary channel 34 in the first body 50a is reduced. That is, the pressure received by the entire main valve 21 is reduced. Note that the time during which the reaction gas flows through the sub-flow channel 32 depends on the distance between the sub-valve 41 of the valve rod 40 and the separating flange portion 42 and the driving speed of the actuator 60.

  Further, when the valve rod 40 is moved in the direction A by the operation of the actuator 60, the open state of the sub valve 41 (FIG. 2) is changed to the open state of the main valve 21 (FIG. 1). At this time, the separating collar portion 42 abuts against one side surface of the main valve 21, and the main valve 21 is separated from the valve seat 53 and is opened. The actuator 60 continues the operation of the diaphragm 62 until the main valve 21 is opened.

  While the main valve 21 is in the open state, the reaction gas flows toward the main channel 31 and is supplied to a stack manifold (not shown) attached to the secondary channel 34 side.

  Next, the fuel cell gas shut-off valve 10 transitions from the open state shown in FIG. 1 to the closed state shown in FIG. 3 through an intermediate state where the sub valve 41 shown in FIG. 2 is opened. The case will be described. By actuating the actuator 60, the valve stem 40 moves in the B direction. At this time, gas is caused to flow from the port 54a into the valve-closing pressure receiving chamber 54 to be higher than the pressure-opening pressure-receiving chamber 55 in the valve-closing pressure receiving chamber 54, and the diaphragm 62 is lowered in the B direction. In parallel with the operation of the diaphragm 62, the valve stem 40 moves in the B direction, the sub valve 41 comes into contact with the sub seal 23 and is brought into a close contact state while deforming the sub seal 23. It abuts on the portion 25.

  Further, when the valve stem 40 is moved in the B direction by the operation of the actuator 60, the sub valve 41 pushes the main valve 21 in the B direction, and the main seal portion 22 of the main valve 21 is in contact with the valve seat 53 while being deformed. Close contact. That is, the auxiliary valve 41 and the main valve 21 are sealed by the auxiliary seal portion 23 and the main seal portion 22, respectively, so that the valve body 20 of the fuel cell gas cutoff valve 10 is closed (FIG. 3).

  The effects of the first embodiment will be described below.

  When the valve is opened in the above operation, the valve rod 40 can open the auxiliary valve 41 having a smaller pressure receiving area than the main valve 21 with a weak thrust to allow the reaction gas to flow through the auxiliary flow path 32. The difference between the primary side flow path 33 and the secondary side flow path 34 generated by the main valve 21 being blocked by the main valve 21 in the first body 50 a after the reaction gas flows in the sub flow path 32. The pressure drops. Due to this action, the negative pressure received by the main valve 21 is reduced in the valve body 20 and can be easily opened. Further, since the thrust required for the actuator 60 may be the thrust for opening the auxiliary valve 41, the valve body 20 is opened even if it is smaller than the structure of the conventional main valve 21 alone. Therefore, the actuator 60 can be downsized. Even when the opening area of the stack manifold (not shown) is required, the opening area can be secured with the small actuator 60.

  Moreover, the valve opening time of the subvalve 41 can be adjusted by adjusting the space | interval of the subvalve 41 and the separation collar part 42. FIG. Further, the auxiliary flow path 32 can be easily provided without requiring a complicated structure in the valve body 20 and has a small diameter with respect to the main flow path 31, thereby reducing valve opening noise generated when the valve is opened. be able to.

  On the other hand, when the valve is closed, when the main seal portion 22 and the sub seal portion 23 come into contact with the valve seat 53 and the sub valve 41, respectively, high sealing performance is obtained by elastic deformation of rubber or resin. Further, since the gasket 24 is formed by integrally forming the main seal portion 22 and the sub seal portion 23, the cost can be reduced in the manufacturing process. Further, the main valve 21 has a sub seal portion 23 at a position where the main valve 21 and the sub valve 41 abut, and the flat seal contact portion 25 is provided on the inner edge of the sub seal portion 23. When sealed by the sub valve 41, the crushing margin due to the elastic deformation of the sub seal portion 23 can be managed, and the durability is improved. Further, by providing the fixed-size contact portion 25, the pressing force can be directly transmitted from the sub valve 41 to the main valve 21, and the management of the load on the main seal portion 22 is facilitated.

  Next, a second embodiment will be described with reference to the drawings.

  FIG. 6 is a front sectional view of the fuel cell gas cutoff valve in the second embodiment. The same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The difference between the first embodiment and the second embodiment is that the urging spring 61 is attached to the diaphragm mounting portion 43 of the valve rod 40, the urging direction of the urging spring 61, the valve-closing pressure receiving chamber 54 and the valve-opening valve. The positional relationship of the pressure receiving chamber 55, the valve opening direction (A direction) and the valve closing direction (B direction) of the auxiliary valve 41, and the other configurations are the same. Hereinafter, a part of the operation of the second embodiment will be described.

  When closing the valve body 20, the main seal portion 22 provided in the main valve 21 of the valve body 20 is moved to the first body 50 a by moving the valve rod 40 upward (direction A) in FIG. 6 by the actuator 60. The valve seat 53 provided in the above is contacted, and the flow of the reaction gas in the main flow path 31 is shut off. In addition, the flow of the reaction gas in the auxiliary flow path 32 is blocked in a state where the auxiliary valve 41 provided in the valve rod 40 and the auxiliary seal portion 23 provided in the main valve 21 are in contact with each other. Due to the constant-size contact portion 25 provided in the main valve 21, the sub-valve 41 comes into contact with the main valve 21 while the sub-seal portion 23 is deformed and adhered.

  Further, when the valve body 20 is opened, the valve stem 40 is moved downward (B direction) in FIG. 6 by the actuator 60, whereby the secondary valve 41 provided in the valve stem 40 is brought into contact with the secondary seal portion 23 and the fixed size contact. The reaction gas is circulated through the sub-channel 32 while being separated from the portion 25. After the reaction gas flows through the sub-channel 32 and the differential pressure between the primary-side channel 33 and the secondary-side channel in the first body 50a decreases, the main valve 21 provided with the main seal portion 22 It is pushed away from the valve seat 53 by being pushed by the pull-off collar portion 40.

  The effects of the second embodiment will be described below.

  When the valve is opened in the above operation, the valve rod 40 opens the sub valve 41 having a smaller pressure receiving area than the main valve 21 with a small thrust, and causes the reaction gas to flow through the sub flow path 32. As a result, the differential pressure between the primary flow path 33 and the secondary flow path 34 in the first body 50a is reduced, the valve body 20 can be easily opened, and the actuator 60 can be downsized. I can plan. Other effects are the same as those in the first embodiment, and are omitted.

  4 and the shape of the separating collar portion 42 of the valve stem 40 in FIG. 5 are also applicable to the second embodiment.

  In the first and second embodiments, the reaction gas in the body 50 flows from the primary side flow path 33 to the secondary side flow path 34, but is shown in FIGS. 1 to 3 and FIG. 6. As described above, the fuel cell gas cutoff valve 10 having a flow passage design from the secondary side passage 34a to the primary side passage 33a can also be implemented.

DESCRIPTION OF SYMBOLS 10 ... Fuel cell gas cutoff valve 20 ... Valve body 21 ... Main valve 22 ... Main seal part 23 ... Sub seal part 24 ... Gasket 25 ... Fixed dimension contact part 31 ... Main flow path 32 ... Sub flow path 33 ... Primary side flow path 34 ... Secondary side flow path 40 ... Valve rod 41 ... Sub valve 42 ... Separation flange 50 ..Body 53 ... Valve seat 60 ... Actuator

Claims (5)

A valve body that contacts the valve seat and shuts off the reaction gas;
A fuel cell gas shut-off valve comprising an actuator for switching a gas flow state,
The valve body is
A main valve that shuts off a main flow path through which the reaction gas flows between a primary flow path and a secondary flow path that are formed via the valve body that is in contact with the valve seat;
A sub-valve having a smaller channel diameter than the main channel, blocking the sub-channel through which the reaction gas flows between the primary-side channel and the secondary-side channel, and having a smaller diameter than the main valve When,
A valve stem that switches the gas flow state of the main flow path and the sub flow path by the actuator;
A gas shutoff valve for a fuel cell. The main valve is in contact with the valve seat and seals the main flow path;
When the main valve and the sub valve abut, a sub seal part for sealing the sub flow path,
The main seal portion and the sub seal portion are integrally molded by a rubber or resin elastic gasket,
The gas shutoff valve for a fuel cell according to claim 1. The main valve includes a flat sizing contact portion at an inner edge of the sub seal portion.
The gas cutoff valve for a fuel cell according to any one of claims 1 and 2. The sub-flow path is formed between the inner wall surface of the main valve and the valve stem.
The gas cutoff valve for a fuel cell according to any one of claims 1 to 3, wherein the gas cutoff valve is for a fuel cell. The valve stem includes the sub-valve and a pull-off flange portion that separates the main valve from the valve seat,
In the interval between the sub-valve and the separating flange portion, the valve stem is provided to be movable relative to the main valve.
The gas cutoff valve for a fuel cell according to any one of claims 1 to 4, wherein the gas cutoff valve is for a fuel cell.

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