JP4440090B2 - Full tank control valve - Google Patents

Description

  The present invention relates to a full tank regulating valve that prevents supercharging to a fuel tank.

  In general, a fuel tank is provided with a full tank regulating valve that detects a full tank when refueling and closes the tank to prevent supercharging.

  That is, when fuel such as gasoline or light oil is supplied to the fuel tank, the float provided in the full tank regulation valve rises, and when the full tank level is reached, the valve provided in the float closes the discharge port. Then, the replenished fuel rises toward the refueling nozzle inserted into the refueling port, the sensor provided in the refueling nozzle detects the fuel, the refueling lever pulled during replenishment is returned, and refueling It is automatically stopped.

  For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-285929) discloses a case body of a full tank regulating valve attached to a fuel tank, a lower chamber disposed on the fuel tank side, and an upper chamber disposed above the lower chamber. Further, the lower chamber is divided into a first float chamber and a second float chamber, and the first and second float bodies are accommodated in each float chamber. When the first valve body provided in one float body closes the first communication hole communicating with the upper chamber and the refueling is automatically stopped, if the additional refueling is performed manually, the fuel level further increases. And the technique which the replenishment of a fuel tank stops completely because the 2nd valve body provided in the 2nd float body obstruct | occludes the 2nd communicating hole connected to an upper chamber is disclosed.

According to the full tank regulating valve disclosed in this document, after the first valve body is closed, additional fueling is performed, the second float is raised, and the second valve body communicates with the upper chamber. When the hole is closed, the internal pressure of the fuel tank rises, and the sensor provided in the fuel nozzle inserted into the fuel filler port can detect the final full tank and stop the additional fuel supply. It is possible to prevent supercharging.
JP 2002-285929 A

  By the way, when fuel leaks from one or both of the first communication hole and the second communication hole to the upper chamber side, the fuel is returned from the second communication hole to the fuel tank after the first communication hole is closed. Become.

  However, in the full tank regulating valve disclosed in the above-mentioned document, the first communication hole and the second communication hole that open to the upper chamber are formed at the same height, so the fuel tank side from the second communication hole. It is difficult to go back. That is, for example, when the second communication hole is inclined upward from the first communication hole due to the inclination of the fuel tank, the fuel leaked into the upper chamber is difficult to return to the fuel tank through the second communication hole and stays in the upper chamber. There is a disadvantage that the amount of fuel to be increased increases.

  When the engine is operated and the fuel is consumed, the second communication hole opens, so that the fuel staying in the upper chamber is returned to the fuel tank side from the second communication hole, but stays in the upper chamber. If there is a large amount of fuel, there is a disadvantage that the fuel tends to flow to the canister side communicating with the upper chamber before the second communication hole opens.

Accordingly, an object of the present invention is to provide a full tank control valve capable of preventing the fuel from flowing out to the canister side.

  In order to achieve the above object, a first aspect of the present invention is a full tank regulating valve which is disposed in an upper space of a fuel tank and discharges an evaporation gas in the fuel tank at the time of refueling and detects a full tank level. The case body is provided with a communication passage that communicates the inside of the fuel tank and the outside of the fuel tank, and the communication passage is disposed above the first communication passage portion and a first communication passage portion that communicates with the inside of the fuel tank. A space portion and a second communication passage portion that is connected to a first pipe extending outside the fuel tank and opens to the space portion, and is attached to a float body in the first communication passage portion. The valve body is arranged to be movable up and down, and a communication hole that is opened and closed by the valve body and communicates with the space part is provided on the upper surface of the first communication path part. The opening edge to the space is the bottom surface of the space Is formed at the upper end surface of the cylindrical weir protruding upward, and is disposed at a position higher than the communication hole opened and closed by the valve body, the first communication path portion via the partition wall, The first float chamber is partitioned into a first float chamber containing a first float body having a first valve body and a second float chamber containing a second float body having a second valve body. A first communicating hole communicating with the space portion and a first valve seat formed at a lower end of the first communicating hole are provided on the upper surface of the second float chamber, and the upper surface of the second float chamber communicates with the space portion. And a second valve seat formed at the lower end of the second communication hole. The second valve seat with which the second valve body abuts is the first valve body is the first valve. A liquid level higher than the liquid level contacting the seat is detected and provided at a position where the second valve body is contacted. Upper surface of the seat is intended to provide the full tank regulating valve, characterized in that it is set to a position lower than the upper surface of the first valve seat.

According to the first aspect of the present invention, even if a part of the fuel flows into the space formed in the upper portion of the case main body together with the evaporative gas due to the influence of the ripple at the time of refueling, the canister is connected via the first pipe. Since the opening edge portion of the second communication passage portion communicating to the side is formed on the upper end surface of the cylindrical weir and is higher than the communication hole opened and closed by the valve body, the fuel that has flowed into the space portion No longer flows into the canister.

  In addition, since the upper surface of the second valve seat is set at a position lower than the upper surface of the first valve seat, even if fuel leaks from at least one of the first communication hole and the second communication hole during refueling, the fuel is removed. Since it can flow to the 2nd valve seat side lower than the 1st valve seat, it becomes easy to return to the fuel tank side from the 2nd valve seat side, and the outflow to the canister side can be prevented.

  According to a second aspect of the present invention, in the first aspect of the invention, the space portion is provided above the first valve seat and the second valve seat of the case body so as to communicate with both the valve seats. And a full tank regulating valve in which a recess communicating with the space is formed in the upper part of the second valve seat.

  According to the above invention, since the concave portion communicating with the space portion is formed in the upper portion of the second valve seat, the fuel that has flowed into the space portion is retained in the concave portion side, and returned to the tank through the second communication hole. Thus, fuel leakage can be prevented more reliably.

  According to a third aspect of the present invention, in the second aspect of the present invention, the concave portion and the opening edge portion of the second communication passage portion are disposed at a position spaced apart with the first valve seat interposed therebetween. A full tank control valve is provided.

  According to the said invention, since the recessed part is formed in the position isolated from the opening edge part of the 2nd communicating path part, the leakage of the fuel to the 2nd communicating path part side can be prevented more reliably.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the first valve body is provided on the first float body and an upper portion of the first float body and contacts the first valve seat. The first float body has a large cross-sectional area formed in the lower part thereof, a small cross-sectional area part formed between the lower part and the upper part, and the flat plate in the upper part. A full tank regulating valve provided with a valve support portion for supporting a valve-like valve body is provided.

  According to the above invention, when the liquid level in the fuel tank rises, when the first float body and the second float body try to float, the first float is formed by the large cross-sectional area portion formed in the first float body. Since a large buoyancy is generated in the body, even if the first valve seat is located higher than the second valve seat, the first valve seat is closed before the second valve seat.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a third valve body that opens at a predetermined pressure or higher is disposed in the fuel tank, and the third valve body and the second communication body are disposed. A full tank control valve in which a passage portion is communicated with the space portion is provided.

  According to the above invention, the third valve body is opened when the pressure is higher than a preset pressure, and the evaporation gas in the tank is discharged out of the tank, so that damage to the tank and the like can be prevented.

  According to a sixth aspect of the present invention, in the second aspect of the present invention, a third valve body that opens at a predetermined pressure or more is disposed in the fuel tank, and the third valve body and the second communication passage portion are arranged in the above manner. A full tank regulating valve is provided which is communicated via a space portion, and wherein the third valve body and the concave portion formed in the space portion are communicated via a second pipe.

  According to the above invention, only the first pipe needs to be extended to the outside of the fuel tank, and the structure can be simplified.

According to the present invention, even if part of the fuel flows into the space formed in the upper portion of the case body together with the evaporative gas due to the influence of undulations at the time of refueling, it communicates with the canister via the first pipe. Since the opening edge of the second communication passage is formed on the upper end surface of the cylindrical weir and is located higher than the communication hole opened and closed by the valve body, the fuel flowing into the space is on the canister side Can be prevented from flowing into.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a full tank control valve, FIGS. 2 to 4 are side sectional views according to the state of the full tank control valve, and FIGS. 5 to 7 are diagrams showing a state where a full tank control valve is attached to a fuel tank. The schematic sectional drawing of is shown.

  The full tank regulating valve 1 according to this embodiment is fixed to the upper part of the inner surface of the fuel tank 2 as shown in FIGS. The fuel tank 2 includes a filler pipe 3 for supplying fuel on one side, and an oil supply port 3 a is formed at the upper end of the filler pipe 3. Reference numeral 4 denotes an oil supply nozzle, and the tip of the nozzle is inserted into the filler pipe 3 from the oil supply port 3a to supply oil.

  As shown in FIG. 1, the case main body 5 of the full tank control valve 1 includes a main body portion 6, a lower cap 7 attached to the lower portion of the main body portion 6, and an upper cap 8 attached to the upper portion of the main body portion 6. And have. Flange portions 6 a and 6 b extend on both sides of the upper portion of the main body portion 6, and the flange portions 6 a and 6 b are fixed to the upper inner surface of the fuel tank 2 via the first bracket 29.

  As shown in FIGS. 2 to 4, a communication passage 9 is formed in the main body 6. The communication passage 9 is divided into a first communication passage portion 10 that extends upward from the lower end and a second communication passage portion 11 that communicates with a vent port 6 c that projects to one side of the main body portion 6. A space portion 12 is formed in a divided portion of the communication passage portions 10 and 11. The space portion 12 is closed by an upper portion of the main body portion 6 and an upper cap 8 attached to the upper portion.

  The first communication passage portion 10 is partitioned into a large-diameter first float chamber 14 and a small-diameter second float chamber 15 via a partition wall 13. Both the float chambers 14 and 15 contain a first float body 16 and a second float body 17 constituting the first and second valve bodies, respectively. Both float bodies 16 and 17 are made of a synthetic resin such as polyamide, and are lifted by buoyancy due to the fuel flowing into the float chambers 14 and 15. Each of the float chambers 14 and 15 is formed in a taper shape with a predetermined gradient that narrows upward. It is formed in a shape.

  Further, as shown in FIG. 1, the first float body 16 has a cylindrical large cross-sectional area 16a formed in the lower part thereof, and a small cross-sectional area part 16c formed in a cross shape by the separator 16b on the upper part. The valve support 16d is formed in a ring shape at the upper end. A valve main body 18 is housed in the valve support portion 16d, and a valve cap 19 is mounted on the outer periphery of the valve support portion 16d. The valve main body 18 is mounted so as to be movable in the vertical direction within the valve support portion 16d, and a flat valve body 20 is mounted on the upper portion of the valve main body 18.

  The amount of upward movement of the valve body 18 is hooked by the valve cap 19 and is prevented from coming off. In a state where the valve main body 18 is hooked on the valve cap 19, the flat valve body 20 protrudes from a hole portion 19 a formed in the center of the valve cap 19. Further, a valve spring 21 is interposed between the upper inner surface of the valve body 18 and the bottom surface of the valve support portion 16 d, and the valve body 18 is constantly urged upward by the valve spring 21.

  A spring accommodating recess 16e is formed in an annular shape on the bottom surface of the first float body 16, and the first float spring 22 is interposed between the upper surface of the spring accommodating recess 16e and the lower cap 7. The first float spring 22 assists the floating of the first float body 16 when the first float body 16 is lifted by the buoyancy received from the fuel. When the liquid level of the fuel is lowered, the first float body 16 is driven by the first weight. The float spring 22 is lowered while being pressed. A first communication hole 23 communicating with the space portion 12 is opened on the upper surface of the first float chamber 14, and a first valve seat 23 a that contacts the flat valve body 20 is formed at the lower end of the first communication hole 23. Has been. Note that a vent hole (not shown) communicating with the fuel tank 2 is formed on the upper side of the first float chamber 14.

  On the other hand, a plurality of guide ribs 17a extending in parallel in the vertical direction are formed on the outer periphery of the second float body 17 at substantially equal intervals, and the guide ribs 17a are in sliding contact with the inner periphery of the second float chamber 15 in the vertical direction. Movement to is allowed. A cap mounting portion 17b is formed at the upper end of the second float body 17, and a seal cap 24 is mounted on the cap mounting portion 17b. A protrusion 24 a that protrudes upward is formed at the center of the seal cap 24.

  Further, a second communication hole 25 communicating with the space portion 12 is opened on the upper surface of the second float chamber 15, and a second valve seat in which the protrusion 24 a of the seal cap 24 is fitted to the lower end of the second communication hole 25. 25a is formed.

  Further, a spring accommodating recess 17 c is formed on the bottom surface of the second float body 17, and a second float spring 26 is interposed between the upper surface of the spring accommodating recess 17 c and the lower cap 7. The second float spring 26 assists the floating of the second float body 17 when the second float body 17 is lifted by the buoyant force received from the fuel. The float spring 26 is lowered while being pressed.

  Moreover, the opening area of the 1st communicating hole 23 is formed large, and the opening area of the 2nd communicating hole 25 is formed small. Therefore, when the first communication hole 23 is opened at the time of fuel replenishment, even if the fuel supply amount is large, the evaporated gas staying in the upper space 2a of the fuel tank 2 is from the first communication hole 23 to the space 12 side. However, when the flat valve body 20 comes into contact with the first valve seat 23a formed at the lower end of the first communication hole 23 and is closed, the evaporative gas is emitted only from the second communication hole 25 side. Flows to the space 12 side, so that the inflow amount of fuel is regulated, and additional replenishment is performed until the protrusion 24a of the seal cap 24 is fitted to the second valve seat 25a and the valve is closed with the inflow amount regulated. Is possible. 3 and 6 is a liquid level indicating an initial full state when the flat valve body 20 contacts the first valve seat 23a and the first communication hole 23 is closed. .

  A liquid level L2 indicating a final full state when at least the protrusion 24a of the seal cap 24 is fitted to the second valve seat 25a on the side surface of the portion corresponding to the second float chamber 15 of the case body 5 (FIG. 4, A third communication hole 27 for communicating the upper space 2a of the fuel tank 2 and the second float chamber 15 is formed slightly above (see FIG. 7). Accordingly, the evaporated gas staying in the upper space 2 a of the fuel tank 2 flows from the third communication hole 27 to the space 12 side through the second communication hole 25. The liquid level L1 indicating the initial full tank and the liquid level L2 indicating the final full tank are the buoyancy between the first float body 16 and the second float body 17, the spring constants of the float springs 22 and 26, and the like. Can be set.

  A concave portion 12a is formed in the upper portion of the space portion 12 on the second communication hole 25 side. Accordingly, the second communication hole 25 is formed at a position lower than the first communication hole 23, and an evaporation port 28 is formed on the second communication hole 25 side of the recess 12a.

  Moreover, the opening edge part 11a of the 2nd communicating path part 11 is formed in the position separated on both sides of the 1st communicating hole 23 with respect to the recessed part 12a. The opening edge portion 11 a is formed on the upper end surface of the cylindrical weir 12 b protruding upward from the bottom surface of the space portion 12 where the first communication hole 23 is opened, and is disposed at a position higher than the first communication hole 23. Has been.

  A vent port 6 c that communicates with the second communication passage portion 11 is connected to a first pipe 31 that extends to the outside of the fuel tank 2. The first pipe 31 communicates with a canister 32 disposed outside the fuel tank 2, and the canister 32 communicates with an intake system of an engine (not shown).

  On the other hand, the evaporation port 28 is communicated via a second pipe 35 to a check valve 34 as a third valve body fixed to the upper part of the inner surface of the fuel tank 2. The check valve 34 is fixed to the upper part of the inner surface of the fuel tank 2 via the second bracket 30 and has an intake port (not shown) communicating with the outside. This check valve 34 opens when the internal pressure of the fuel tank rises when the two communication holes of the full tank control valve are closed, and when the pressure exceeds a certain level, the evaporation gas is discharged out of the tank. This prevents damage to the tank.

  Further, the check valve 34 is connected to a cut valve 37 fixed to the upper part of the inner surface of the fuel tank 2 via a third bracket 36. The cut valve 37 has a float valve therein, and prevents fuel from leaking by blocking fuel from entering the evaporation pipe, for example, when the automobile turns or falls.

Next, the operation of the full tank control valve having such a configuration will be described.
First, as shown in FIG. 5, with the remaining amount of fuel stored in the fuel tank 2 being small, the nozzle tip of the fuel nozzle 4 is inserted into the fuel filler port 3a of the filler pipe 3, and a fuel lever (not shown) is pulled, Fuel is supplied into the fuel tank 2. When fuel is supplied into the fuel tank 2 from the fuel supply nozzle 4, the liquid level of the fuel staying in the fuel tank 2 gradually rises. As a result, the volume of the upper space 2a of the fuel tank 2 is gradually reduced, and the evaporative gas staying in the upper space 2a is first floated from a vent hole (not shown) drilled on one side of the case body 5. It passes through the chamber 14 and the first communication hole 23 and flows into the space portion 12 formed in the upper part of the case body 5.

  Then, the evaporative gas flowing into the space 12 flows from the second communication passage 11 to the canister 32 side via the first pipe 31 and is adsorbed by the canister 32. Since the opening area of the first communication hole 23 is relatively large, the internal pressure of the upper space 2a of the fuel tank 2 does not rise more than necessary when refueling, and fuel can be replenished smoothly. it can.

  Thereafter, as shown in FIG. 6, when the liquid level in the fuel tank 2 rises and the liquid level becomes higher than the bottom of the case body 5, the fuel is introduced into the first float chamber 14 formed in the case body 5. Flows in, and the first float body 16 contained in the first float chamber 14 floats by the resultant force of its own buoyancy and the urging force of the first float spring 22. At that time, since the fuel also flows into the second float chamber 15, the second float body 17 contained in the second float chamber 15 also tends to float by the resultant force of its own buoyancy and the second float spring 26. However, since the lower part of the first float body 16 has a cylindrical large cross-sectional area 16a, a large buoyancy is generated. Therefore, even if the first valve seat 23a is higher than the second valve seat 25a, the first valve seat 23a is closed before the second valve seat 25a.

  As shown in FIG. 3, when the liquid level reaches the liquid level L <b> 1 indicating the initial full tank, the flat valve body 20 provided via the valve main body 18 on the upper part of the first float body 16. The first communication hole 23 is closed by coming into contact with the first valve seat 23 a formed in the first communication hole 23 opened in the upper part of the first float chamber 14.

  Then, the evaporative gas staying in the upper space 2a of the fuel tank 2 does not flow from the first communication hole 23 to the canister 32 side, and the internal pressure of the fuel tank 2 relatively increases. As a result, the fuel rises in the filler pipe 3, the sensor provided in the fuel supply nozzle 4 detects the fuel, the fuel supply is automatically stopped, and the inside of the fuel tank 2 is in an initial full state.

  On the other hand, when the liquid level of the fuel becomes higher than the bottom of the case body 5, the fuel flows into the second float chamber 15, but the upper portion of the second float body 17 contained in the second float chamber 15. Since the gap is formed between the protrusion 24a of the seal cap 24 provided on the second cap and the second communication hole 25, the evaporated gas staying in the upper portion of the fuel tank 2 is drilled on one side of the case body 5. It enters the second float chamber 15 through the third communication hole 27, and flows into the space portion 12 formed in the upper part of the case body 5 from the second communication hole 25.

  In that case, since the opening area of the 2nd communicating hole 25 is formed comparatively small, since a large amount of fuel cannot be replenished from a fueling nozzle, additional fueling is performed manually. When the fuel is additionally supplied into the fuel tank 2, the second float body 17 is raised. Thereafter, as shown in FIGS. 4 and 7, when the liquid level reaches the liquid level L2 indicating the final full tank, the protrusion 24a of the seal cap 24 provided on the second float body 17 is moved to the second float. The first communication hole 23 is closed by abutting against the first valve seat 23 a formed in the second communication hole 25 opened in the upper part of the chamber 15.

  Then, the fuel moves up the filler pipe 3, and a sensor provided in the fuel supply nozzle 4 detects the final full tank and stops the additional fuel supply.

  Thus, in this embodiment, the first communication hole 23 and the second communication hole are formed by the flat valve body 20 provided in the first float body 16 and the seal cap 24 provided in the second float body 17. 25 is closed at different liquid level L1 and L2, and after the initial full tank is detected at the first liquid level L1, additional refueling can be performed manually, and when the liquid level L2 is reached. The second communication hole 25 is closed and the final full tank is detected. When the final full tank is detected, no further refueling is possible, so that subsequent supercharging can be prevented.

  Further, even if a part of the fuel flows into the space portion 12 formed in the upper portion of the case body 5 together with the evaporative gas due to the influence of undulations at the time of refueling, the second communication passage portion 11 that communicates with the canister 32 side. Since the opening edge portion 11a is formed on the upper end surface of the cylindrical weir 12b, the fuel flowing into the space portion 12 does not flow into the canister 32 side.

  Further, since the concave portion 12a is formed in the space portion 12, the fuel that has flowed into the space portion 12 is retained on the concave portion 12a side due to vibration during traveling, inclination of the vehicle body, and the like, so that the second communication passage portion 11 is retained. The leakage of fuel to the side can be further prevented. In addition, since the recess 12a is formed at a position isolated from the opening edge portion 11a of the second communication passage portion 11 with the first communication hole 23 in between, the fuel leaks to the second communication passage portion 11 side more. It can be surely prevented.

  Further, since the second communication hole 25 is opened at the bottom of the recess 12a, when the fuel in the fuel tank 2 is consumed and the second float body 17 descends, the second communication hole 25 opens and the recess The fuel staying in 12a can be returned to the fuel tank 2 from the second communication hole 25. Therefore, fuel does not always stay in the space portion 12, and fuel leakage to the second communication passage portion 11 side can be effectively prevented.

  The first pipe 31 communicating with the canister 32 side and the second pipe 35 communicating with the check valve 34 side are connected to the vent port 6c and the evaporation port 28 communicating with the space 12, and the check valve 34 is a fuel tank. 2, the first pipe 31 only needs to be extended to the outside of the fuel tank 2, and the structure can be simplified.

The present invention prevents supercharging to the fuel tank, and even if fuel leaks from the communication hole during refueling, the fuel can be easily returned to the fuel tank and can be prevented from flowing out to the canister. It can be used as a full tank control valve.

It is a disassembled perspective view which shows one Embodiment of the full tank control valve of this invention. It is side surface sectional drawing when the fuel residual amount of the same full tank control valve is small. It is side surface sectional drawing at the time of the initial full tank of the same full tank control valve. It is side surface sectional drawing at the time of the last full tank of the same full tank control valve. It is a schematic sectional drawing when there is little fuel residual quantity of the fuel tank to which the same full tank control valve is applied. It is a schematic sectional drawing at the time of the initial full tank of the fuel tank to which the same full tank control valve is applied. It is a schematic sectional drawing at the time of the last full tank of the fuel tank to which the same full tank control valve is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Full tank control valve 2 Fuel tank 2a Upper space 4 Refueling nozzle 5 Case main body 6 Main body part 6c Vent port 7 Lower cap 8 Upper cap 9 Communication path 10 1st communication path part 11 2nd communication path part 11a Opening edge part 12 Space Part 12a Concave part 12b Weir part 14 First float chamber 15 Second float chamber 16 First float body 16a Large cross-sectional area part 16c Small cross-sectional area part 16d Valve support part 16e Accommodating concave part 17 Second float body 18 Valve body 19 Valve cap 20 Flat valve body 23 1st communication hole 23a 1st valve seat 24 Seal cap 25 2nd communication hole 25a 2nd valve seat 27 3rd communication hole 31 1st piping 32 Canister 33 Relief valve 34 Check valve 35 2nd piping L1, L2 liquid level

Claims (6)

In a full tank regulating valve that is disposed in the upper space of the fuel tank and discharges the evaporation gas in the fuel tank at the time of refueling and detects the full tank level,
The case body is provided with a communication passage that communicates the inside and outside of the fuel tank,
The communication passage is connected to a first communication passage portion communicating with the inside of the fuel tank, a space portion disposed above the first communication passage portion, and a first pipe extending outside the fuel tank, It is composed of a second communication passage portion that opens to the space portion,
A valve body attached to a float body is disposed in the first communication passage portion so as to be movable up and down, and a communication surface communicating with the space portion opened and closed by the valve body is provided on an upper surface of the first communication passage portion. Holes are provided,
The opening edge part to the said space part of the said 2nd communicating path part is formed in the upper end surface of the cylindrical dam protruding upward from the bottom face of the said space part, and is higher than the communicating hole opened and closed by the said valve body Is located at a position,
The first communication passage portion includes a first float chamber in which a first float body having a first valve body is accommodated and a second float body in which a second float body having a second valve body is accommodated via a partition wall. It is divided into a float room,
A first communication hole communicating with the space and a first valve seat formed at a lower end of the first communication hole are provided on the upper surface of the first float chamber. A second communication hole communicating with the space portion and a second valve seat formed at the lower end of the second communication hole;
The second valve seat with which the second valve body abuts is provided at a position where the second valve body abuts upon detecting a liquid level higher than the liquid surface with which the first valve body abuts the first valve seat. And
Furthermore, the full tank regulating valve, wherein the upper surface of the second valve seat is set at a position lower than the upper surface of the first valve seat. The space is provided above the first valve seat and the second valve seat of the case body so as to communicate with both valve seats,
The full tank control valve according to claim 1, wherein a concave portion communicating with the space portion is formed in an upper portion of the second valve seat.   3. The full tank regulating valve according to claim 2, wherein the full tank regulating valve is disposed between the concave portion and the opening edge portion of the second communication passage portion so as to be separated from each other with the first valve seat interposed therebetween. . The first valve body has a first float body and a flat valve body provided on an upper portion of the first float body and capable of contacting the first valve seat,
The first float body has a large cross-sectional area formed in the lower part thereof, a small cross-sectional area part formed between the lower part and the upper part, and a valve support part for supporting the flat plate-like valve body is provided in the upper part. The full tank control valve according to any one of claims 1 to 3. A third valve body that opens at a predetermined pressure or more is disposed in the fuel tank;
The full tank regulating valve according to any one of claims 1 to 4, wherein the third valve body and the second communication passage portion are communicated with each other via the space portion. A third valve body that opens at a predetermined pressure or more is disposed in the fuel tank;
The third valve body and the second communication passage portion are communicated with each other via the space portion,
The full tank regulating valve according to claim 2, wherein the third valve body and the concave portion formed in the space portion are communicated with each other via a second pipe.

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