JP2008075596A - Fuel cutoff valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cutoff valve 10 which realizes high sealing performance by preventing positional displacement when returning to an original position after a relief valve 70 is opened. <P>SOLUTION: A fuel cutoff valve 10 contains a float mechanism 50 and pressure adjusting mechanism 60 in a casing 20. The pressure adjusting mechanism 60 includes: a float valve opening 74b provided facing a connection passage 74a and opened/closed by ascent/descent of the float mechanism 50; and a relief valve element 71 for opening/closing a relief valve opening 33b. The relief valve element 71 is a guide rib 33d formed facing a relief passage 33a and is guided in an axial direction near the relief passage 33a. <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). In this technique, the relief valve is provided with a seal portion that allows the float to contact and separate. However, the relief valve has a problem in that it tends to cause a positional deviation when it returns to its original state after opening, and the sealing performance tends to deteriorate.

Japanese Patent Laid-Open No. 6-147045

  The present invention provides a fuel shut-off valve capable of preventing misalignment when returning to the original position after the relief valve is opened and obtaining high sealing performance, in light of solving the above-described problems of the conventional technology. The purpose is to do.

The present invention made to solve the above problems
A fuel shut-off valve that is mounted on the upper part of the fuel tank, and that opens and closes a connection passage and a relief passage that connect the inside and outside of the fuel tank so as to cut off the communication between the fuel tank and the external passage.
A first valve chamber connected to the fuel tank; a second valve chamber connected to the first valve chamber through the connection passage and the relief passage and connected to an external passage; and facing the connection passage; A casing forming a float valve opening provided on the first valve chamber side, and a relief valve opening facing the relief passage and provided on the second valve chamber side;
A float mechanism housed in the first valve chamber for opening and closing the float 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 relief valve body housed in the second valve chamber for opening and closing the relief valve opening;
A spring for urging the relief valve body in the valve closing direction;
A guide rib that faces the relief passage and is provided on at least one of the relief peripheral edge of the relief valve body and the relief valve opening, and guides the relief valve body in an opening and closing direction;
It is characterized by having.

  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 float valve opening provided facing the connection passage. Prevent fuel from flowing out of the fuel tank.

  The pressure regulating valve mechanism assembled to the fuel shut-off valve is a state in which the relief valve body opens the relief valve opening when the tank internal pressure exceeds a predetermined pressure with the float mechanism closing the float valve opening. To the outside 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.

  A guide rib for guiding the relief valve body in the opening / closing direction is provided facing at least one of the opening peripheral portion of the relief valve body and the relief valve opening. Since the guide rib is provided at a position facing the relief passage that is opened and closed by the relief valve body, the axial displacement of the relief valve body is prevented in the vicinity of the relief valve opening, and high sealing performance can be obtained.

  Further, since the guide rib faces the relief passage and is provided between the relief valve body and the opening peripheral portion of the relief valve opening, a gap is formed between the guide rib and the internal pressure of the tank is not increased. The predetermined pressure state can be quickly eliminated.

  Furthermore, as a preferred aspect of the pressure regulating valve mechanism, the relief valve body includes a guide mechanism that aligns the float mechanism by contacting the upper part of the float mechanism at the lower part of the relief valve body. Can be taken. Further, the guide mechanism includes a guide protrusion protruding in the axial direction at a lower portion of the relief valve element, and a guide hole formed at an upper portion of the float mechanism and protruding and retracting the lower portion of the guide protrusion. Configuration can be taken. With this configuration, the positional deviation between the float mechanism and the relief valve element is eliminated, so that the sealability between the float seal portion and the valve portion can be enhanced.

  As a preferred aspect of the present invention, the pressure regulating valve mechanism may have a configuration including a check valve body that opens and closes a check valve valve opening provided facing the connection passage. With this configuration, in a state where the float mechanism does not close the float valve opening, the check valve body receives when the pressure received through the connection passage does not exceed the predetermined pressure, that is, when the pressure does not exceed the urging force of the spring. The check valve valve opening is in a closed state, and it does not vent to the external passage, so that the amount of fuel vapor discharged can be suppressed. The check valve body opens the relief valve opening when the pressure received through the connection passage and the check valve valve opening exceeds a predetermined pressure, and ensures ventilation to the external passage in the fuel tank.

  Further, as a preferred aspect of the check valve body, the check valve body can be arranged so as to be able to contact and separate from the relief valve body, and can be configured to transmit the urging force of the spring to the relief valve body. In addition, the check valve body may include a negative pressure valve that opens when the tank internal pressure becomes a predetermined negative pressure or more from the external passage and releases the tank internal pressure to the external passage. With these configurations, the check valve and the negative pressure valve can be assembled to the fuel cutoff valve with a simple configuration.

  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 attached to the tank upper wall FTa of the fuel tank FT, and regulates the outflow of fuel to the outside when the fuel in the fuel tank FT rises during refueling, when the vehicle tilts or swings, etc. And a valve for 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 flange 21 is integrally formed on the upper part of the casing 20, and a packing PK is interposed between the flange 21 and the upper surface of the tank upper wall FTa of the fuel tank FT, and screwed with a plate PT. Is attached to the upper part of the fuel tank FT.

(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 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. 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 relief valve 70 and a check valve 80 that are 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. In FIG. 4, the relief valve 70 is a valve that decompresses the inside of the fuel tank by opening when the pressure in the relief passage 33 a exceeds a predetermined value. An upper portion of the relief passage 33a is a relief valve opening 33b, and a relief seal portion 33c is provided at an opening peripheral portion of the relief valve opening 33b. FIG. 5 is a perspective view showing the vicinity of the relief passage 33a, and FIG. 6 is a horizontal sectional view of the vicinity of the relief passage 33a. Guide ribs 33d are formed on the opening peripheral edge of the relief valve opening 33b, and guide ribs 38a are provided on the inner wall of the storage wall 38, and these guide the lower and upper portions of the relief valve 70 in the axial direction. It is provided as follows.

  Returning to FIG. 4, the relief valve 70 includes a relief valve body 71 that is biased in the closing direction by a spring 62. The relief valve body 71 includes a valve portion 72 projecting downward in a mountain shape, and a cylindrical side wall 73 projecting from the outer periphery of the valve portion 72, and is formed in an upward cup shape having a space 71S. Yes. The valve portion 72 is formed with a seat portion 72a that is attached to and detached from the relief seal portion 33c.

  In the configuration of the relief valve 70, as shown in FIG. 7, the upward force applied to the seat portion 72a of the relief valve body 71 by the pressure through the relief passage 33a is the weight of the relief valve 70, the check valve 80, and the negative pressure valve 90. When the total urging force of the spring 62 is exceeded, the relief valve element 71 moves upward to open the relief passage 33a, whereby the inside of the fuel tank is filled with the first valve chamber 30S, the relief passage 33a, The two valve chamber 60S communicates with the canister via the pipe passage 39a.

  Further, a passage forming portion 74 is formed in the relief valve body 71 shown in FIG. The passage forming unit 74 includes a connection passage 74a connected to the first valve chamber 30S. A float valve opening 74b is formed facing the connection passage 74a, and a float seal portion 74c is formed at the periphery of the opening of the float valve opening 74b. The connection passage 74a is opened and closed when the valve portion 51a of the float mechanism 50 contacts and separates from the float seal portion 74c.

  The check valve 80 is a valve that opens when the pressure in the connection passage 74a of the relief valve body 71 exceeds a predetermined pressure. A check valve valve opening 75b is formed in the passage forming portion 74 of the relief valve body 71 so as to face the connection passage 74a, and a check valve seal portion 75c is provided at the opening peripheral portion of the check valve valve opening 75b. Is formed. The check valve seal portion 75 c is formed on the inclined surface of the inner wall of the passage forming portion 74.

  The check valve 80 includes a check valve body 81 that is biased in the closing direction by a spring 62. The check 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 an upward cup shape having a space 81S. A seat portion 82 a is projected from the valve portion 82. The sheet portion 82a is an annular protrusion, and the tip thereof is an inclined surface.

  In the configuration of the check valve 80, as shown in FIG. 8, when the upward pressure applied to the valve portion 82 by the pressure through the connection passage 74a exceeds the urging force of the spring 62 and the dead weight of the check valve 80 and the negative pressure valve 90. The check valve body 81 moves upward to open the float valve opening 74b, so that the fuel vapor in the fuel tank passes through the first valve chamber 30S, the connection passage 74a, the second valve chamber 60S, and the pipe passage 39a. Communicate with the canister.

  In FIG. 4, a negative pressure valve 90 is a valve that cancels the negative pressure of the tank internal pressure by opening a negative pressure passage 84 a that penetrates the passage forming protrusion 84 of the check valve body 81. The passage forming protrusion 84 includes a negative pressure valve opening 84b provided facing the negative pressure passage 84a, and a negative pressure valve seal portion provided on the lower center surface of the valve portion 82 of the check valve body 81 and facing the negative pressure valve opening 84b. 84c. 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 81 when the support portion 92 is press-fitted into the valve insertion hole 84d, and a negative pressure passage 84a is formed by a gap between the support portion 92 and the passage formation protrusion 84. Yes.

  In the configuration of the negative pressure valve 90, as shown in FIG. 9, when the tank internal pressure becomes negative pressure and exceeds the elastic force that causes the valve portion 91 to bend due to the balance of pressure applied to the front and back surfaces of the valve portion 91, the seat The portion 91a is separated from the negative pressure valve seal portion 84c. Thereby, it connects to the fuel tank FT from the canister side through the pipe passage 39a, the second valve chamber 60S, the negative pressure passage 84a, and the connection passage 74a, so that the negative pressure in the fuel tank is eliminated.

(3) Operation of the fuel shut-off valve 10 As shown in FIG. 8, due to the increase in tank internal pressure, the upward force due to the tank internal pressure applied to the valve portion 82 of the check valve body 81 through the first valve chamber 30S and the connection passage 74a When the biasing force of the spring 62 and the downward force due to the weight of the check valve body 81 and the negative pressure valve 90 are exceeded, the check valve body 81 moves upward and the connection passage 74a is opened. Thereby, the fuel vapor in the fuel tank is released to the canister via the first valve chamber 30S, the connection passage 74a, and the pipe passage 39a. That is, fuel vapor is released to the canister through the check valve 80 when the tank internal pressure exceeds the first pressure value while the connection passage 74a is open.

  Then, as shown in FIG. 10, when the fuel level in the fuel tank FT reaches a predetermined level due to the inclination or swing of the vehicle, the fuel passes through the communication hole 35b of the bottom plate 35 and the first valve chamber 30S. Flow into. Thereby, buoyancy is generated in the float 51 and the float 51 rises, and the valve portion 51a of the float 51 is seated on the float seal portion 74c and closes the connection passage 74a, so that fuel does not flow out to the canister side.

  As shown in FIG. 7, in a state where the valve portion 51a of the float 51 closes the connection passage 74a, the tank internal pressure rises and exceeds the second pressure value larger than the first pressure value, and passes through the relief passage 33a. When the upward force applied to the seat portion 72a of the relief valve body 71 by pressure exceeds the total force of the relief valve 70 and the check valve 80, the weight of the negative pressure valve 90, and the biasing force of the spring 62, the relief valve body 71 The relief passage 33a is opened by moving upward. Thereby, the inside of the fuel tank is connected to the canister via the first valve chamber 30S, the relief passage 33a, 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. 9, when the tank internal pressure 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 becomes negative. Elastically deforms away from the pressure valve seal portion 84c. Thereby, the pipe passage 39a, the second valve chamber 60S, the negative pressure passage 84a, the connection passage 74a, and the first valve chamber 30S are connected from the canister side to the fuel tank FT so that the negative pressure in the fuel tank is eliminated. Act on.

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

(4) -1 As shown in FIG. 7, in the state where the float mechanism 50 is closing the float valve opening 74b, the pressure regulating valve mechanism 60 is configured so that the relief valve element 71 is turned on when the tank internal pressure exceeds a predetermined pressure. The relief valve opening 33b is opened to release the tank internal pressure to the external passage. Therefore, even when the float mechanism 50 closes the connection passage 74a, the tank internal pressure does not exceed a predetermined value, and the fuel tank is prevented from being damaged.

(4) -2 The pressure regulating valve mechanism 60 ensures ventilation with respect to the external passage only when the tank internal pressure exceeds a predetermined value. That is, as shown in FIG. 8, when the float mechanism 50 does not close the float valve opening 74b, the check valve element 81 receives the pressure through the connection passage 74a not exceeding the first pressure value, that is, the pressure. When the pressure does not exceed the urging force of the spring 62, the check valve valve opening 75b 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 81 opens the check valve valve opening 75b when the pressure received through the connection passage 74a exceeds a predetermined pressure, and ensures ventilation to the external passage in the fuel tank FT.

(4) -3 As shown in FIGS. 5 and 6, the guide rib 33 d provided on the opening peripheral edge of the relief valve opening 33 b is provided at a position facing the relief passage 33 a opened and closed by the relief valve body 71. Therefore, the axial displacement of the relief valve element 71 is prevented in the vicinity of the relief valve opening 33b, and high sealing performance can be obtained. The guide rib 33d faces the relief passage 33a and is provided between the relief valve element 71 and the opening peripheral edge of the relief valve opening 33b. Therefore, a gap is formed between the guide rib 33d and the ventilation resistance is greatly increased. However, when the tank internal pressure becomes higher than a predetermined pressure, it can be quickly eliminated. Moreover, the guide rib 38 a provided on the inner wall of the storage wall 38 can also prevent the axial displacement of the relief valve body 71 by guiding the side wall 73 of the relief valve body 71.

(4) -4 As shown in FIG. 9, the negative pressure valve 90 is a rubber valve body, and can be easily configured by assembling it integrally with the check valve body 81.

  FIG. 11 is an explanatory view illustrating a guide mechanism for guiding a check valve and a float mechanism according to another embodiment. This embodiment is characterized by the structure of a guide mechanism that aligns the upper part of the relief valve body 71B and the float mechanism 50B. That is, a guide protrusion 75Ba projecting in the axial direction is formed at the lower portion of the relief valve body 71B. In addition, a guide hole 75Bb is formed on the upper surface of the float 51B of the float mechanism 50B so that the guide protrusion 75Ba protrudes and descends in accordance with the elevation of the float mechanism 50B and the elevation of the relief valve body 71B. With this configuration, since the positional deviation between the float mechanism 50B and the relief valve body 71B is eliminated, the sealing performance between the float seal portion 74Bc and the valve portion 51Ba can be improved.

  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 a perspective view which shows the vicinity of a relief channel | path. It is sectional drawing of the horizontal direction of the vicinity of a relief channel | path. It is explanatory drawing explaining operation | movement of a relief valve. It is explanatory drawing explaining operation | movement of a check 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 explanatory drawing explaining the guide mechanism provided over the check valve and float mechanism concerning another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cutoff valve 20 ... Casing 21 ... Flange 30 ... Casing main body 30S ... 1st valve chamber 30a ... Lower opening 31 ... Ceiling wall part 33a ... Relief passage 33b ... Relief valve opening 33c ... Relief seal part 33d ... Guide rib 34 ... Side wall part 34a ... Vent hole 34b ... Engaging claw 35 ... Bottom plate 35a ... Joint hole 35b ... Communication hole 35c ... Spring support part 36 ... Upper cover 38 ... Storage wall 38a ... Guide rib 39 ... Tube part 39a ... Pipe passage 50 ... Float mechanism 50B ... Float mechanism 51 ... Float 51B ... Float 51S ... Float chamber 51a ... Valve 51b ... Guide protrusion 51Ba ... Valve 52 ... Spring 60 ... Pressure regulating valve mechanism 60S ... Second valve chamber 62 ... Spring 70 ... Relief valve 71 ... Relief valve element 71B ... Relief valve element 71S ... Space 72 ... Part 72a ... Seat part 73 ... Side wall 74 ... Passage forming part 74a ... Connection passage 74b ... Float valve opening 74c ... Float seal part 74Bc ... Float seal part 75b ... Check valve opening 75c ... Check valve seal 75Ba ... Guide protrusion 75Bb ... Guide hole 80 ... Check valve 81 ... Check valve body 81S ... Space 82. .. Valve part 82a ... Seat part 83 ... Side wall 84 ... Passage forming projection 84a ... Negative pressure passage 84b ... Negative pressure valve opening 84c ... Negative pressure valve seal part 84d ... Valve insertion hole 90 ... Negative pressure valve 91 ... Valve part 91a ... Seat part 92 ... Supporting part 93 ... Removal part PK ... Packing FT ... Fuel tank PT ... Plate FTa ... the tank upper wall

Claims (6)

The fuel tank (FT) and the external passage are mounted on an upper portion of the fuel tank (FT), and the connection passage (74a) and the relief passage (33a) connecting the inside and outside of the fuel tank (FT) are opened and closed. In the fuel cutoff valve that cuts off the communication,
A first valve chamber (30S) connected in the fuel tank (FT), connected to the first valve chamber (30S) through the connection passage (74a) and the relief passage (33a) and to an external passage A casing (20) forming a second valve chamber (60S) to be connected and a relief valve opening (33b) provided facing the relief passage (33a);
A float mechanism (50) which is housed in the first valve chamber (30S) and moves up and down with increasing or decreasing buoyancy according to the fuel level in the first valve chamber (30S);
A pressure regulating valve mechanism (60) housed in the second valve chamber (60S) and for adjusting the tank internal pressure of the fuel tank (FT);
With
The pressure regulating valve mechanism (60)
The relief passage opening (74a), and a float valve opening (74b) that faces the connection passage (74a) and is opened and closed by raising and lowering the float mechanism (50). A relief valve body (71) for opening and closing 33b);
A spring (62) for urging the relief valve body (71) in the valve closing direction;
It faces the relief passage (33a) and is provided on at least one of the opening peripheral portions of the relief valve body (71) and the relief valve opening (33b), and guides the relief valve body (71) in the opening / closing direction. A guide rib (33d);
A fuel cutoff valve characterized by comprising: The fuel cutoff valve according to claim 1,
The relief valve element (71) includes a guide mechanism (75B) that aligns the float mechanism (50) by contacting the upper part of the float mechanism (50) at the lower part of the relief valve element (71). Fuel shut-off valve. The fuel cutoff valve according to claim 2,
The guide mechanism (75B) includes a guide protrusion (75Ba) projecting in the axial direction at the lower part of the relief valve body (71) and the guide protrusion (75Ba) formed at the upper part of the float mechanism (50). And a guide hole (75Bb) for projecting and lowering the lower part of the fuel cutoff valve. The fuel cutoff valve according to any one of claims 1 to 3,
The said pressure regulating valve mechanism (60) is a fuel cutoff valve provided with the check valve body (81) which opens and closes the valve opening (75b) for check valves provided facing the said connection channel | path (74a). The fuel cutoff valve according to claim 4,
The check valve body (81) is disposed so as to be able to contact and separate from the relief valve body (71), and is configured to transmit the urging force of the spring (62) to the relief valve body (71). valve. The fuel cutoff valve according to claim 4 or 5,
The check valve body (81) includes a negative pressure valve (90) that opens when the internal pressure of the tank becomes a predetermined negative pressure or more from the external passage and releases the internal pressure of the tank to the external passage. valve.

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