JP2008075622A - Fuel cutoff valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cutoff valve 10 which allows assembly of a pressure adjusting valve mechanism 60 therein with a simple constitution. <P>SOLUTION: A fuel cutoff valve 10 contains: a float mechanism 50 closed by a liquid level of fuel in a fuel tank; and a pressure adjusting mechanism 60 for adjusting internal pressure in a fuel tank FT. The pressure adjusting mechanism 60 keeps a spring 62 interposed between a check valve element 71 and a relief valve element 81. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cutoff valve that is attached to an upper part of a fuel tank and that opens and closes a connection passage that connects the inside and outside of the fuel tank to cut off communication between the fuel tank and the outside.

  A fuel shut-off valve (rollover valve) is provided in the upper part of the fuel tank. By opening and closing at a predetermined fuel liquid level, air can be vented to the outside of the fuel tank, and the liquid fuel can be connected outside. Prevents outflow. The rollover valve shuts off fuel to the outside at a fuel level higher than the full tank level in order to ensure ventilation when the vehicle is tilted or when the vehicle is running slalom.

  By the way, as a fuel shut-off valve, there are a check valve for reducing the amount of fuel vapor in the fuel tank sent to the canister, and a relief valve for preventing damage to the fuel tank by maintaining the tank internal pressure within a predetermined range. An incorporated configuration is known (Patent Document 1). However, these fuel shut-off valves have a problem that the number of parts is large and the configuration is complicated.

JP 2004-36449 A

  An object of the present invention is to provide a fuel shut-off valve in which a pressure regulating valve mechanism for adjusting a tank internal pressure is incorporated with a small number of parts and in a simple configuration, in view of solving the problems of the conventional technology.

The present invention made to solve the above problems
In a fuel cutoff valve mounted on the upper part of the fuel tank, which opens and closes a connection passage and a relief passage that connect the inside of the fuel tank and an external passage, respectively, so as to cut off the communication between the fuel tank and the external passage.
A first valve chamber connected in the fuel tank; a second valve chamber connected to the first valve chamber through the connection passage and connected to an external passage; and the first valve facing the connection passage Forming a first valve opening provided on the chamber side, a second valve opening facing the connection passage and on the second valve chamber side, and a third valve opening provided facing the relief passage. A casing,
A float mechanism housed in the first valve chamber for opening and closing the first valve opening by raising and lowering the buoyancy according to the fuel level in the first valve chamber;
A pressure adjustment valve mechanism for adjusting the tank internal pressure of the fuel tank;
With
The pressure regulating valve mechanism is
A check valve body housed in the second valve chamber and opening and closing the second valve opening;
A relief valve body that is housed in the second valve chamber and is disposed to face the check valve body, and opens and closes the third valve opening;
A spring that is stretched between the check valve body and the relief valve body, and urges the check valve body and the relief valve body in a valve closing direction, respectively;
It is provided with.

  The fuel shut-off valve according to the present invention is mounted on the upper part of the fuel tank, and the float mechanism is raised by the fuel level in the fuel tank to close the first valve opening provided facing the connection passage. Prevent fuel from flowing out of the tank.

  Further, the pressure regulating valve mechanism provided in the fuel cutoff valve ensures ventilation to the external passage only when the tank internal pressure exceeds a predetermined value. That is, when the float mechanism does not close the first valve opening and the pressure received through the connection passage does not exceed the first pressure value, that is, when the pressure does not exceed the urging force of the spring, The second valve opening is in a closed state, the air is not vented to the external passage, and the fuel vapor discharge amount can be suppressed. The check valve body opens the second valve when the pressure received through the connection passage exceeds the first pressure value, and ensures ventilation to the external passage in the fuel tank.

  Further, in the pressure regulating valve mechanism, the relief valve element opens the third valve opening when the tank internal pressure exceeds a second pressure value larger than the first pressure value in a state where the float mechanism closes the first valve opening. Open to release the tank internal pressure to the external passage. Therefore, even when the float mechanism closes the connection passage, the tank internal pressure does not exceed a predetermined value, and the fuel tank is prevented from being damaged.

  Further, since the spring is interposed between the check valve body and the relief valve body and applies an urging force to both valves, the number of parts is reduced and the configuration can be simplified.

  Further, as a preferred aspect of the present invention, the pressure receiving area where the check valve body receives the tank internal pressure in the valve opening direction through the second valve opening is such that the relief valve body is tanked in the valve opening direction through the third valve opening. The structure set larger than the receiving pressure area which receives internal pressure can be taken. With this configuration, the first pressure value and the second pressure value at which the check valve body and the relief valve body of the pressure regulating valve mechanism are opened are the first pressure receiving area that the check valve body receives through the second valve opening, and the relief The second pressure receiving area that the valve body receives through the third valve opening is set. Therefore, the valve opening pressures of the check valve body and the relief valve body can be easily set depending on the parameters of the first pressure receiving area and the second pressure receiving area.

  As a preferred aspect of the present invention, the casing can be configured to include a casing body having the first valve opening and the second valve opening, and an upper lid having the third valve opening. With this configuration, the seal portions of the opening peripheral portions of the first valve opening and the second valve opening can be formed on different members, that is, the casing body and the upper lid, respectively, so when these are formed by injection molding Less likely to cause defects such as sink marks. In this case, if the first valve opening, the second valve opening, and the third valve opening are arranged on the same axis, it is easy to take measures against resin sink marks, etc. It becomes easy to set the valve opening pressure of the check valve and relief valve.

  Further, as a preferred aspect of the present invention, the check valve body includes a negative pressure valve which opens when the tank internal pressure becomes a predetermined negative pressure or more than the external passage and releases the tank internal pressure to the external passage. It is possible to take the configuration provided. With this configuration, the configuration of the negative pressure valve when the tank internal pressure becomes negative can be easily assembled to the check valve body.

  Furthermore, as another aspect of the present invention, it is possible to adopt a configuration provided with a spring that is stretched between the casing and the relief valve body and biases the relief valve body in the valve closing direction. With this configuration, when the valve opening pressure of the relief valve changes for each vehicle, it is possible to cope with the set load of the second spring without changing the size of the third valve opening.

  In order to further clarify the configuration and operation of the present invention described above, preferred embodiments of the present invention will be described below.

(1) Schematic configuration of fuel cutoff valve 10 FIG. 1 is a cross-sectional view showing a fuel cutoff valve 10 attached to an upper portion of a fuel tank FT of an automobile according to an embodiment of the present invention. The fuel shut-off valve 10 is a so-called in-tank type that is mounted in the fuel tank FT. When the fuel in the fuel tank FT rises during refueling, when the vehicle tilts or swings, the fuel to the outside This is a valve for regulating the outflow of the tank and maintaining the tank internal pressure within a predetermined range. The fuel cutoff valve 10 includes a casing 20, a float mechanism 50, a spring 52, and a pressure adjustment valve mechanism 60. A valve mounting portion 21 is integrally formed on the upper portion of the casing 20, and the fuel cutoff valve 10 is mounted in the fuel tank FT via a bracket BK welded to the lower surface of the tank upper wall FTa of the fuel tank FT. It has been.

(2) Configuration of each part of fuel cutoff valve 10 (2) -1 casing 20
FIG. 2 is an exploded sectional view of the fuel cutoff valve. In FIG. 2, the casing 20 includes a casing body 30, a bottom plate 35 attached to a lower portion of the casing body 30, and an upper lid 36. The casing body 30 includes a ceiling wall portion 31 and a side wall portion 34 that extends downward from the ceiling wall portion 31 in a cylindrical shape, and is surrounded by the ceiling wall portion 31 and the side wall portion 34. A single valve chamber 30S is formed, and the lower part is a lower opening 30a. A first passage forming projection 32 projects downward from the center of the ceiling wall portion 31. The connection passage 32a passes through the first passage formation protrusion 32, the first valve chamber 30S side of the connection passage 32a is a first valve opening 32b, and the opening peripheral edge portion of the first valve opening 32b is The first seal portion 32c is provided. A vent hole 34a that connects the inside of the fuel tank FT and the first valve chamber 30S is formed in the upper portion of the side wall portion 34, and an engaging claw 34b is formed in the lower portion thereof. The engaging claw 34 b is for attaching the bottom plate 35. The bottom plate 35 is a member that closes the lower opening 30a of the casing body 30, and the lower opening of the casing body 30 is engaged by engaging the engaging claw 34b of the casing body 30 with the engaging hole 35a formed on the outer periphery thereof. It is mounted so as to close 30a. A communication hole 35 b is formed through the bottom plate 35. Further, a spring support portion 35 c for supporting the lower end of the spring 52 is formed on the upper surface of the bottom plate 35.

  In addition, a cylindrical storage wall 38 is provided on the upper portion of the casing 20, and the second valve chamber 60 </ b> S is formed by covering the upper opening of the storage wall 38 with the upper lid 36. On the side wall of the storage wall 38, a tubular body portion 39 protruding to the side is formed. A tube passage 39a is formed in the tube portion 39, and one end of the tube passage 39a is connected to the second valve chamber 60S, and the other end is connected to the canister side.

(2) -2 Float mechanism 50
The float mechanism 50 is housed in the first valve chamber 30 </ b> S, and includes a container-shaped float 51 and a spring 52. The inner space of the float 51 is a float chamber 51S for generating buoyancy. On the upper part of the float 51, a substantially conical valve portion 51a projects. The valve portion 51a is configured to open and close the first valve opening 32b by contacting and separating from the first seal portion 32c by raising and lowering the float mechanism 50. In addition, a plurality of guide protrusions 51 b are provided on the outer peripheral portion of the float mechanism 50 so as to protrude in a plurality of locations in the vertical direction in order to enhance the slidability with respect to the inner wall surface of the casing body 30. The spring 52 is disposed in the float chamber 51 </ b> S and biases the float 51 upward by being interposed between one end of the float 51 and the spring support portion 35 c of the bottom plate 35.

(2) -3 Pressure regulating valve mechanism 60
FIG. 3 is an enlarged sectional view of the vicinity of the pressure regulating valve mechanism 60. The pressure regulating valve mechanism 60 is housed in the second valve chamber 60S at the upper part of the casing 20, and includes a spring 62, a check valve 70 and a relief valve 80 biased in the closing direction by the spring 62, and a negative pressure valve 90. And.

  FIG. 4 is an exploded cross-sectional view of the pressure regulating valve mechanism 60. The check valve 70 is a valve that opens when the pressure in the connection passage 32a penetrating the second passage formation protrusion 33 exceeds the first pressure value. The 2nd channel | path formation protrusion 33 is provided with the 2nd valve opening 33b provided facing the connection channel | path 32a, and the 2nd seal part 33c provided in the opening peripheral part of the 2nd valve opening 33b.

  The check valve 70 includes a check valve body 71 that is biased in the closing direction by a spring 62. The check valve body 71 includes a disc-like valve portion 72 and a cylindrical side wall 73 protruding from the outer periphery of the valve portion 72, and is formed in an upward cup shape that forms a space 71S. The valve portion 72 is formed with a seat portion 72a. The seat part 72a opens and closes the second valve opening 33b by contacting and separating from the second seal part 33c.

  In the structure of the check valve 70, as shown in FIG. 5, when the upward force applied to the valve portion 72 by the pressure through the connection passage 32a exceeds the urging force of the spring 62, the check valve body 71 moves upward. Thus, the second valve opening 33b is opened, whereby the fuel vapor in the fuel tank communicates with the canister via the first valve chamber 30S, the connection passage 32a, the second valve chamber 60S, and the pipe passage 39a.

In FIG. 4, the relief valve 80 opens when the pressure of the relief passage 37 a penetrating the third passage forming protrusion 37 of the upper lid 36 exceeds a second pressure value higher than the first pressure value, A valve that depressurizes the inside of the fuel tank. The 3rd channel | path formation protrusion 37 is provided with the 3rd valve opening 37b provided facing the relief channel | path 37a, and the 3rd seal part 37c provided in the 3rd valve opening 37b at the opening peripheral part.
The relief valve 80 includes a relief valve body 81 that is biased in the closing direction by a spring 62. The relief valve body 81 includes a disc-shaped valve portion 82 and a cylindrical side wall 83 protruding from the outer periphery of the valve portion 82, and is formed in a cup shape having a space 81S. The valve portion 82 is formed with a seat portion 82a.
In the configuration of the relief valve 80, as shown in FIG. 6, when the downward force applied to the valve portion 82 by the pressure through the relief passage 37a exceeds the urging force of the spring 62, the relief valve body 81 moves downward. Thus, the third valve opening 37b is opened, whereby the inside of the fuel tank communicates with the canister via the relief passage 37a, the second valve chamber 60S, and the pipe passage 39a.

  In FIG. 4, the negative pressure valve 90 is a valve that eliminates the negative pressure of the tank internal pressure by opening a valve flow path 74 a that penetrates the passage forming protrusion 74 of the check valve element 71. The passage forming protrusion 74 includes a negative pressure valve opening 74b provided facing the in-valve flow path 74a, and a seal portion 74c facing the negative pressure valve opening and provided on the central lower surface of the valve portion 72 of the check valve body 71. ing. The negative pressure valve 90 is formed of an umbrella-shaped rubber valve body, and includes an umbrella-shaped valve portion 91, a support portion 92 formed upward from the center portion of the valve portion 91, and the support portion 92. And a retaining portion 93 projecting from the outer peripheral portion. The valve portion 91 is formed with a seat portion 91a. The negative pressure valve 90 is supported by the check valve body 71 by press-fitting the support portion 92 into the valve insertion hole 74d, and forms an in-valve flow path 74a in the gap between the support portion 92 and the passage forming projection 74. ing.

  In the configuration of the negative pressure valve 90, as shown in FIG. 7, if the pressure inside the fuel tank becomes negative and the elastic force that the valve portion 91 bends due to the balance of pressure applied to the front and back surfaces of the valve portion 91 is exceeded, The sheet portion 91a is separated from the seal portion 74c. Thus, the negative pressure in the fuel tank is eliminated by connecting to the fuel tank FT from the canister side through the in-valve channel 74a through the pipe passage 39a, the second valve chamber 60S, the in-valve channel 74a, and the connection passage 32a. Acts as follows.

(3) Operation of the fuel cutoff valve 10 Next, the operation of the fuel cutoff valve 10 will be described. As shown in FIG. 5, the upward force due to the internal pressure of the tank applied to the valve portion 72 of the check valve 70 is applied to the valve portion 72 of the check valve 70 through the first valve chamber 30S and the connection passage 32a due to the swinging, tilting, and refueling of the vehicle. When the force, the check valve body 71 and the negative pressure valve 90 exceed the downward force due to their own weight, the check valve body 71 moves upward and the connection passage 32a is opened. Thereby, the fuel vapor in the fuel tank is released to the canister via the first valve chamber 30S, the connection passage 32a, and the pipe passage 39a. That is, fuel vapor is released to the canister through the check valve 70 when the tank internal pressure exceeds the first pressure value.

  As shown in FIG. 8, when the fuel level in the fuel tank FT reaches a predetermined level FL due to vehicle inclination or swinging, the fuel passes through the communication hole 35 b of the bottom plate 35 and the first valve chamber. Flows into 30S. As a result, buoyancy is generated in the float 51 and the float 51 is raised and the valve portion 51a of the float 51 is seated on the first seal portion 32c to close the connection passage 32a, so that fuel does not flow out to the canister side.

  As shown in FIG. 6, when the tank internal pressure rises and exceeds the second pressure value in a state where the valve portion 51a of the float 51 closes the connection passage 32a, the upward pressure applied to the pressure receiving surface of the relief valve 80 increases. When the force and the weight of the relief valve 80 exceed the urging force of the spring 62, the relief valve body 81 moves downward, the seat portion 82a is separated from the third seal portion 37c, and the relief passage 37a is opened. As a result, the inside of the fuel tank is connected to the canister via the relief passage 37a, the second valve chamber 60S, and the pipe passage 39a, and the tank internal pressure is maintained below the second pressure value.

  As shown in FIG. 7, when the internal pressure of the tank becomes negative and the elastic force that causes the valve 91 to bend due to the balance of pressure applied to the front and back surfaces of the valve 91 of the negative pressure valve 90 is exceeded, the seat 91a is sealed. Elastically deforms away from the portion 74c. Accordingly, the pipe tank 39a, the second valve chamber 60S, the valve passage 74a, the connection passage 32a, and the first valve chamber 30S are connected to the fuel tank FT from the canister side, and the negative pressure in the fuel tank is eliminated. Acts as follows.

(4) Operation and effect of fuel cutoff valve The configuration of the above embodiment provides the following operation and effect.

(4) -1 The pressure regulating valve mechanism 60 ensures ventilation to the external passage only when the tank internal pressure exceeds a predetermined value. That is, as shown in FIG. 5, when the float mechanism 50 does not close the first valve opening 32b, the check valve element 71 receives the pressure through the connection passage 32a when the pressure does not exceed the first pressure value, that is, the pressure. When the pressure does not exceed the urging force of the spring 62, the second valve opening 33b is in a closed state, the air is not vented to the external passage, and the amount of fuel vapor discharged can be suppressed. The check valve element 71 opens the second valve opening 33b when the pressure received through the connection passage 32a exceeds the first pressure value, and ensures ventilation to the external passage in the fuel tank FT.

(4) -2 As shown in FIG. 6, the pressure regulating valve mechanism 60 sets the second pressure value in which the tank internal pressure is larger than the first pressure value in a state where the float mechanism 50 closes the first valve opening 32 b. When exceeding, the relief valve body 81 opens the third valve opening 37b to release the tank internal pressure to the external passage. Accordingly, even when the float mechanism 50 closes the connection passage 32a, the tank internal pressure can be made equal to or lower than the second pressure value, and damage to the fuel tank is prevented.

(4) -3 As shown in FIG. 3, the first pressure value Pr1 and the second pressure value Pr2 at which the check valve body 71 and the relief valve body 81 of the pressure regulating valve mechanism 60 are opened are the check valve body 71. Is set by the first pressure receiving area Ar1 received through the second valve opening 33b and the second pressure receiving area Ar2 received by the relief valve body 81 through the third valve opening 37b. That is, since the spring 62 that urges the check valve body 71 and the relief valve body 81 is the same, the opening force of the check valve body 71 and the relief valve body 81 is determined by Pr1 × Ar1 and Pr2 × Ar2. . Therefore, the valve opening pressures of the check valve body 71 and the relief valve body 81 can be easily set depending on the parameters of the first pressure receiving area Ar1 and the second pressure receiving area Ar2.

(4) -4 Since the spring 62 is interposed between the check valve element 71 and the relief valve element 81 and applies a biasing force to both valves, the number of parts is reduced and the configuration can be simplified.

(4) -5 Since the first seal portion 32c and the third seal portion 37c of the first valve opening 32b and the third valve opening 37b are formed in different members, that is, the casing body 30 and the upper lid 36, respectively. When these are formed by injection molding, defects such as sink marks are less likely to occur. Moreover, since the first valve opening 32b, the second valve opening 33b, and the third valve opening 37b are arranged on the same axis, it is easy to take measures against resin sink marks, etc. Setting of the valve opening pressure of the check valve body 71 and the relief valve body 81 is also facilitated.

(4) -6 The negative pressure valve 90 is a rubber valve body, and can be easily configured by assembling it integrally with the check valve body 71.

  FIG. 9 is a sectional view showing the vicinity of a pressure regulating valve mechanism according to another embodiment. This embodiment is characterized in that a new spring is provided for setting the valve opening pressure of the check valve. That is, the first spring 62B is stretched between the check valve body 71B of the check valve 70B and the relief valve body 81B of the relief valve 80B constituting the pressure regulating valve mechanism 60B. Moreover, the 2nd spring 84B is spanned between the relief valve body 81B and the upper surface of the ceiling wall part 31B of the casing 20B. The second spring 84B biases the relief valve body 81B in the valve closing direction. Further, the pressure receiving area Ar1 of the check valve body 71B through the second valve opening 33Bb and the second pressure receiving area Ar2 of the relief valve body 81B through the third valve opening 37Bb are formed to be the same. According to the present embodiment, when the valve opening pressure of the relief valve 80B changes for each vehicle, the set load of the second spring 84B can be used without using the upper cover 36B having the changed size of the third valve opening 37Bb. Yes.

  The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the invention.

It is sectional drawing which shows the fuel cutoff valve attached to the upper part of the fuel tank of the motor vehicle concerning one Example of this invention. It is sectional drawing which decomposes | disassembles and shows a fuel cutoff valve. It is sectional drawing to which the vicinity of the pressure regulation valve mechanism was expanded. It is sectional drawing which decomposes | disassembles and shows a pressure regulating valve mechanism. It is explanatory drawing explaining operation | movement of a check valve. It is explanatory drawing explaining operation | movement of a relief valve. It is explanatory drawing explaining operation | movement of a negative pressure valve. It is explanatory drawing explaining operation | movement of a fuel cutoff valve. It is sectional drawing which shows the vicinity of the pressure regulation valve mechanism concerning another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cutoff valve 20 ... Casing 21 ... Valve mounting part 30 ... Casing main body 30S ... 1st valve chamber 30a ... Lower opening 31 ... Ceiling wall part 32 ... First passage forming protrusion 32a ... Connection passage 32b ... First valve opening 32c ... First seal part 33 ... Second passage forming protrusion 33b ... Second valve opening 33c ... Second seal part 34 ... Side wall part 34a ... Vent hole 34b ... Engagement claw 35 ... Bottom plate 35a ... Engagement hole 35b ... Communication hole 35c ... Spring support part 36. .. Upper lid 37 ... third passage forming projection 37a ... relief passage 37b ... third valve opening 37c ... third seal portion 38 ... housing wall 39 ... tubular portion 39a. ..Pipe passage 50 ... Float mechanism 51 ... Float 51S ... Float chamber 51a ... Valve part 51b ... Guide protrusion 52 ... Spring 60 ... Pressure adjustment valve mechanism 60S .. .Second valve chamber 62 ... Spring 70 ... Check valve 1 ... Check valve body 71S ... Space 72 ... Valve part 72a ... Sheet part 73 ... Side wall 74 ... Passage forming projection 74a ... Valve flow path 74b ... Negative Pressure valve opening 74c ... Seal part 74d ... Valve insertion hole 80 ... Relief valve 81 ... Relief valve element 81S ... Space 82 ... Valve part 82a ... Seat part 83 ... Side wall 90 ... Negative pressure valve 91 ... Valve part 91a ... Seat part 92 ... Supporting part 93 ... Prevention part 20B ... Case 31B ... Ceiling wall part 33Bb ... Second valve opening 36B ... Upper lid 37Bb ... Third valve opening 60B ... Pressure regulating valve mechanism 62B ... First spring 70B ... Check valve 71B ... Check valve body 80B ... Relief valve 81B ... Relief valve body 84B 2nd spring BK Bracket FT Fuel tank FTa Tank upper wall

Claims (6)

The fuel tank (FT) is connected to the outside by opening and closing a connection passage (32a) and a relief passage (37a) that are mounted on the upper portion of the fuel tank (FT) and connect the inside of the fuel tank (FT) and the external passage. In the fuel cutoff valve that cuts off communication with the passage,
A first valve chamber (30S) connected in the fuel tank (FT), and a second valve chamber connected to the first valve chamber (30S) through the connection passage (32a) and to an external passage (60S), a first valve opening (32b) facing the connection passage (32a) and provided on the first valve chamber (30S) side, a second valve chamber facing the connection passage (32a) and the second valve chamber ( A casing (20) forming a second valve opening (33b) provided on the 60S) side and a third valve opening (37b) provided facing the relief passage (37a);
A float mechanism (50) which is housed in the first valve chamber (30S) and opens and closes the first valve opening (32b) by raising and lowering the buoyancy according to the fuel level in the first valve chamber (30S). When,
A pressure adjusting valve mechanism (60) for adjusting the tank internal pressure of the fuel tank (FT);
With
The pressure regulating valve mechanism (60)
A check valve body (71) housed in the second valve chamber (60S) and opening and closing the second valve opening (33b);
A relief valve body (81) housed in the second valve chamber (60S) and disposed opposite the check valve body (71) to open and close the third valve opening (37b);
A spring (62) which is stretched between the check valve body (71) and the relief valve body (81) and biases the check valve body (71) and the relief valve body (81) in the valve closing direction. )When,
A fuel cutoff valve comprising: The fuel cutoff valve according to claim 1,
The pressure receiving area where the check valve body (71) receives the tank internal pressure in the valve opening direction through the second valve opening (33b) is the opening direction of the relief valve body (81) through the third valve opening (37b). The check valve body (71) is opened at the first pressure value (Pr1), and the relief valve body (81) is set to the first pressure value (Pr1). A fuel shut-off valve configured to perform a valve opening operation at a larger second pressure value (Pr2). The fuel cutoff valve according to claim 1 or 2,
The casing (20) includes a casing body (30) having the first valve opening (32b) and the second valve opening (33b), and an upper lid (36) having the third valve opening (37b). Fuel shut-off valve. The fuel cutoff valve according to any one of claims 1 to 3,
The first valve opening (32b), the second valve opening (33b), and the third valve opening (37b) are fuel cutoff valves arranged coaxially. The fuel cutoff valve according to any one of claims 1 to 4,
The check valve body (71) is provided with a negative pressure valve (90) that opens when the tank internal pressure becomes a negative pressure greater than or equal to a predetermined value from the external passage and releases the tank internal pressure to the external passage. Shut-off valve. In the fuel cutoff valve according to any one of claims 1, 3, 4, and 5,
Furthermore, a fuel cutoff valve provided with a spring (84B) that is stretched between the casing (20B) and the relief valve body (81B) and biases the relief valve body (81B) in the valve closing direction.

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