JP2583245B2 - Liquefied gas extraction valve with shut-off valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefied gas discharge valve with a shut-off valve, and more particularly, to a discharge valve for discharging a liquefied gas from a pressure-resistant gas container in a liquid state. In particular, a dual safety function of an over-prevention function that prevents a large amount of liquefied gas flowing out of a specified gas flow rate or more and an emergency shut-off function that prevents the gas from flowing out when an accident such as a failure of the forced vaporizer occurs. The present invention relates to a liquefied gas discharge valve with a shut-off valve provided with:

[Prior art] For example, passenger cars, trucks,
In a vehicle such as a bus or a forklift, a liquefied gas is taken out of a gas tank in a liquid state, and the liquefied gas in the liquid state is vaporized by a forced vaporizer and used for a predetermined purpose.

As an extraction valve for extracting this liquefied gas in a liquid state from the gas tank, for example, in the event of an accident such as cutting of piping, disconnection of various connectors, destruction of the extraction valve itself, failure of a drive unit such as an engine, etc. In order to prevent the risk of a large amount of liquefied gas flowing out, when a large amount of liquefied gas flowing out of a predetermined gas flow rate or more flows out, a check valve is closed and an overflow prevention valve that shuts off the gas flow rate is provided. A liquefied gas outlet valve with an overflow prevention valve is used.

As a conventional liquefied gas discharge valve with an overflow prevention valve, as shown in FIG. 11, as shown in FIG. 11, a gas inlet 4a that opens into a pressure-resistant gas container and opens inside the container is provided as shown in FIG. Gas passage 4 having a gas outlet 4b opening to the outside
A valve body 1 having a valve seat 5 formed in the gas passage 4 and a gas passage 4 provided on the valve body 1 and seated on or away from the valve seat 5. , A valve body 2 having a through passage 9, and a check valve 7 for shutting off the through passage 9 of the body 6 when a gas flow path exceeds a predetermined value.
And a spring 8 for returning the check valve 7 to its open position when the gas flow path 4 is closed, and is provided in the gas flow path 4 between the valve seat 5 and the opening 4a in the container. A valve 3 is known, and a check valve 7 of the overflow prevention valve 3 has a valve body 2 after the overflow prevention valve 3 is operated.
When the gas flow path 4 is closed by the spring 8 and the check valve 7 is returned to its open position by the spring 8, the pressure and pressure in the closed space in the gas flow path 4 partitioned by the valve seat 5 and the check valve 7 are increased. A minute hole 7a for equalizing the pressure in the gas container and returning the check valve 7 to its closed position is formed.

[Problems to be Solved by the Invention] However, in this type of conventional extraction valve, when the flow rate of the liquefied gas passing through the gas flow path 4 is in an excessive state, the check valve 7 operates and the gas flow path 4 Can prevent danger due to a large amount of gas leakage. However, unless the valve body 2 of the valve body 1 is closed, a small amount of gas leakage continues from the minute hole 7a of the check valve 7. In particular, when the place where the accident occurs is a closed space, the space may be gradually filled with gas, which may result in a dangerous state.

If the check valve 7 of the overflow prevention valve 3 does not shut off for some reason, there is a risk that the liquefied gas in the pressure-resistant gas container flows out to the forced vaporizer.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and in order to solve the above technical problem, a gas inlet opening into a pressure-resistant gas container and an opening toward a forced vaporizer side. A shutoff valve having a valve body having a gas flow passage communicating with a gas outlet, provided with a function of preventing a liquefied gas from overflowing and an emergency shutoff function of shutting off in an emergency such as a failure of a drive unit. It is intended to provide a liquefied gas withdrawal valve.

That is, the present invention provides a valve body having a gas flow path that communicates a gas inlet opening into a pressure-resistant gas container and a gas outlet opening into a forced vaporizer side; A valve body which is removably seated on a valve seat formed in the passage to open and close the gas flow path, and which is formed on the gas intake side from the valve body and has a predetermined gas flow rate in the gas flow path. An overflow prevention valve that shuts off the gas flow path when the above is reached;
A shutoff valve formed on the outlet side with respect to the valve body and the overflow prevention valve to shut off the gas flow path due to a failure of a driving unit or the like, wherein the shutoff valve is for shutting off the gas flow path. A valve body, a switch selector for urging an elastic force to constantly apply the shut-off valve body to the closed position, and an opening actuated by the drive unit to open the shut-off valve body against the elastic force The opening means opens and closes the shut-off valve body in accordance with the operation / stop of the drive source of the forced vaporizer, and provides a liquefied gas discharge valve with a shut-off valve. It is assumed that.

In the present invention, the valve element is removably seated on a valve seat formed in a gas flow path of the valve body to open and close the gas flow path,
The overflow prevention valve may be any valve as long as it has a function of shutting off the gas flow path when the flow rate of the gas passing through the gas flow path reaches a predetermined value or more. The release pin protrudes toward the overflow prevention valve on the seating surface side of the valve, and the release pin protrudes toward the valve body on the seating surface side of the overflow prevention valve. It is better to form the check valve to open when the release pin and the release pin engage when seated on the seat, and to prevent the valve body from overflowing when the valve body is seated on the valve seat. Between the closed space in the gas flow path partitioned by the valve and the inside of the pressure-resistant gas container, between the closed space and the inside of the pressure-resistant gas container when the valve body is seated on the valve seat. And a bypass for returning from the overflow prevention valve, which is shut off when the valve body is separated from the valve seat, may be formed. In this case, when the valve is seated on the valve seat, it bypasses the space between the closed space in the gas flow path separated by the valve and the overflow prevention valve and the inside of the pressure-resistant gas container. It is only necessary that the valve be shut off when the valve body is separated from the valve seat.How to form the valve body can be selected according to the size or material of the valve body. For example, it is constituted by a bypass formed along the valve body and a bypass formed in the valve body, and communicates when the valve body side bypass and the valve body side bypass are seated on the valve seat and in the gas flow path. The closed space and the inside of the pressure-resistant gas container may communicate with each other, and when the valve body is separated from the valve seat, the valve body-side bypass and the valve body-side bypass may be disconnected and shut off, Also, open one end of the bypass between the valve seat of the valve body and the body of the overflow prevention valve. In closing means linked to the valve member may be caused to open and close the end opening of the bypass.

Further, the shut-off valve may be opened and closed with the operation and stop of the drive unit, and may be of any type as long as at least the shut-off valve body is closed when receiving an impact or the like.
It is preferable that the valve stem be provided with a switch selector incorporated in the valve body and connected to the shutoff valve body, and that the opening means be mounted on the outside of the valve body and connected to the valve stem. In this case, the opening means may be any as long as it opens the shut-off valve body against the elastic force. For example, a rotating drive mechanism such as a motor or a reciprocating drive mechanism such as a cylinder may be used. And so on. When the opening means is constituted by a motor, the shut-off valve is provided between the motor, the motor and the shut-off valve body, and a range where the rotation of the motor overcomes the elastic force from the normal voltage position. Or a voltage changeover switch that switches to a pressure reducing position for reducing the load of the motor within the motor, or a motor that forms an opening means with a shutoff valve, and a motor and a shutoff valve body And a changeover switch that is interposed between the motor and the motor and rotates with the rotation of the motor. It is better to comprise a holding means for holding in an open state. In this case, the holding means may be formed by a solenoid which electrically acts (excit), or may be formed by a mechanically operated stopper mechanism or the like.

The drive unit refers to an engine unit that drives a vehicle such as a passenger car or a truck, and a drive system such as a transmission that is interlocked with the engine unit. The drive unit controls the operation and stop of the engine. Any of an electrical system and a mechanical system may be used, for example, an engine start system, an ignition switch which is a power supply source of electric equipment for an ignition system, a battery, an alternator, and a power supply arranged in a manifold of an engine unit. Displacement detection means or engine oil
A device such as a pressure regulator may be used.

[Operation] The above technical means works as follows.

As described above, the shut-off valve includes a shut-off valve that opens and closes the gas flow path on the gas outlet side from the valve body and the overflow prevention valve, and an elastic force to constantly apply the shut-off valve body to the closed position. A switch selector to be urged and opening means actuated by a drive unit to open the shutoff valve body against the elastic force, and the opening means is operated by the drive unit to stop the shutoff valve. By forming so as to control the opening and closing of the body, when the flow rate of the liquefied gas passing through the gas flow path is in an excessive state, the check valve of the overflow prevention valve is activated to prevent a large amount of gas leakage, and When the drive unit is stopped due to a failure of the unit or the like, the opening means is stopped, and the cutoff valve body cuts off the gas flow path by the elastic force of the switch selector.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

◎ First Embodiment FIG. 1 is a sectional view showing a take-out valve of the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. 1. The take-out valve of the present invention is mounted on an LPG tank for an automobile. Is the case.

The outlet valve of the present invention includes a valve body 14 having a gas flow path 13 communicating a gas inlet 11 opening into a pressure-resistant gas container 10 and a gas outlet 12 opening on the forced vaporizer side;
A valve body 20 formed in the gas passage 13 and removably seated on a valve seat 15 formed in the gas passage 13 to open and close the gas passage 13, and a gas flow rate passing through the gas passage 13 is predetermined. Overflow prevention valve 30 that shuts off gas flow path 13
The gas flow path 13 is shut off due to a failure of a drive unit (specifically, a drive system such as an engine unit and a transmission interlocked with the engine unit) formed on the side of the outlet 12 from the overflow prevention valve 30 and the overflow prevention valve 30. A main part is constituted by the shutoff valve 40.

The valve body 20 is provided with a seat packing 21 seated on the valve seat 15.
Is attached to the side of the tip, and an O-ring is
A release pin 23 protruding toward the overflow prevention valve 30 is formed on the seating surface side. Also,
An operation handle 25 attached to the valve body 14 via a ground nut 24 is connected to the valve body 20. On the other hand, the overflow prevention valve
Reference numeral 30 denotes a through passage that is screw-coupled to the gas inlet 11 of the valve body 14.
A check valve 34 having a rubber coat 33 for opening and closing the through passage 31 of the body 32; and a spring 35 for returning the check valve 34 to its open position. An opening pin 37 protruding toward the valve body 20 is formed on a valve stem 36 of the valve 34. The release pin 37 is adapted to engage with the release pin 23 when the valve body 20 is seated on the valve seat 15.
The check valve 34 is moved to the return position against the elastic force of the spring 35 by the engagement of the check pin 34 with the release pin 37. Therefore, when the liquefied gas in the pressure-resistant gas container 10 enters the gas passage 13 at one time through the siphon pipe 16 at the time of an accident such as a failure of the engine section, the check valve 34 resists the elastic force of the spring 35. Then, the gas flow path 13 can be shut off by moving to the closed position. Then, when returning to the normal state after repairing the failed part, operating the operating handle 25 to seat the valve body 20 on the valve seat 15, the release pin 23 and the release pin 37 are engaged and Spring 35
The check valve 34 returns to the normal position due to the combination of the elastic forces.

The shutoff valve 40 is a shutoff valve 41 that opens and closes the gas flow path 13 on the gas outlet 12 side from the valve body 20 and the overflow prevention valve 30,
A switch selector 51 for urging an elastic force to constantly apply the shutoff valve body 41 to the closed position, and an electric device for starting and igniting an engine unit for opening the shutoff valve body 41 against the elastic force. The power supply sources 52 and 53 (specifically, a battery and an alternator) are provided with a geared motor 44 as opening means. Geared motor 44 is an electric circuit
The battery 52 and the alternator 53 are connected to each other via the switch 50, and the shutoff valve 41 is opened and closed as the battery 52 and the alternator 53 operate and stop.

In this case, the shutoff valve body 41 is formed of a ball valve having a through hole 43 that communicates with the gas flow path 13 in a state in which the valve body 41 is in close contact with a seal member 42 formed in the valve body 14.
The ball valve 41 and the drive shaft 45 of the geared motor 44 are connected via a valve stem 46 rotatably mounted on the valve body 14, and a switch selector 51 is fixed to the valve stem 46, and one end of the switch selector 51 is connected to the switch selector 51. Is engaged and the other end engages the valve body 14.
The ball valve 41 always closes the gas flow path 13 by the elastic force of 47. Further, between the gear motor 44 and the shut-off valve element 41, a voltage conversion for switching from a normal voltage state to a pressure reducing position for reducing the load on the gear motor 44 within a range overcoming the elastic force of the return spring 47 by rotation of the gear motor 44. A mechanism 54 is interposed. This voltage conversion mechanism 54 is connected to the battery 52 (12 V).
And a variable contact 57 of a voltage changeover switch 56 for switchably connecting these resistors 55, 55 with a cam 58 formed on the switch selector 51. (See FIG. 2). Therefore, when the geared motor 44 is driven, the switch selector 51 is rotated counterclockwise by the return spring 47 and the variable contact 57 is pressed by the cam 58 of the switch selector 51. When the geared motor 44 is driven, the switch selector 51 returns. When the clock 58 is rotated clockwise against the elastic force of the spring 47 and the engagement between the cam 58 and the variable contact 57 is released, the voltage switch 56 is switched to the low voltage side, and the load on the gear motor 44 is reduced. As well as energy savings.

A locking projection 59 is provided at a position opposite to the cam 58 of the switch selector 51. The locking projection 59 is engaged with the stopper 17 provided at the valve body 14 when the gear motor 44 is not driven. It has been stopped. The geared motor 44 is disposed in a casing 49 attached to the valve body 14 via an airtight packing 48, so that even if liquefied gas leaks outside, ignition by sparks from the motor 44 is prevented. I can do it.

On the other hand, as shown in FIGS. 6 to 8, the electric circuit 50 includes an engine switch 60 having a starting position (S) and an ignition position (IG), which are connected to the anode side of the battery 52 so as to be able to come and go. A first relay contact 61 connected to the starting position (S) of the engine switch 60, a second relay contact 62 connected to the ignition position (IG) of the engine switch 60, and a three-point relay 64 having a relay coil 63. The battery 52 and a drive contact (not shown) of the geared motor 44 are detachably connected to each other through the relay coil 65 and the relay coil 65 connected to the ignition position (IG) of the engine switch 60 and the three-point relay 64. The battery 52 and the alternator 53 are connected via a check relay 67 having a relay contact 66 connected to the relay coil 63 in parallel.

Therefore, when the engine switch 60 is connected to the start position (S) at the time of starting, the geared motor 44 is turned ON from the battery 52 through the first relay contact 61 of the three-point relay 64, and the elasticity of the return spring 47 is increased. The gas valve 13 is opened by rotating the ball valve 41 against the force (see FIG. 6). During traveling, the engine switch 60 is connected to the ignition position (IG), and the alternator 53
When the check relay 67 is turned on by the power generation, the relay coil 65 is excited and the relay contact 66 is connected. By the connection of the relay contact 66, the relay coil 63 of the three-point relay 64 is excited and the second relay is connected. The contact 62 is connected and the gear motor 44 is turned ON (see FIG. 7).
On the other hand, when the engine is stopped, the engine switch 60
Is connected to the OFF position, and the alternator 53 stops power generation. Therefore, the check relay 67 is turned off, and the energization of the relay coil 63 of the three-point relay 64 is stopped, whereby the first relay contact 61 is connected. So a geared motor
The switch 44 is turned off and enters a non-driving state (see FIG. 8). Therefore, when the engine is stopped due to some kind of accident as well as during normal operation stop, the return spring 47 is used.
The ball valve 41 is switched to the closed position by the elastic force of (3) to shut off the gas flow path 13, thereby preventing the liquefied gas from leaking to the outside.

Second Embodiment FIG. 3 is a sectional view showing a second embodiment of the present invention, in which an overflow prevention valve is automatically returned. That is, when the valve body 20 is seated on the valve seat 15, a valve resistance is provided between the closed space in the gas flow path 13 partitioned by the valve body 20 and the check valve 34 and the inside of the pressure-resistant gas container 10. When the valve seat 20 is away from the valve seat 15, the closed space in the gas flow path 13 communicates with the inside of the pressure-resistant gas container 10 when the valve seat 20 is seated on the valve seat 15. This is a case where a bypass 34 for returning the check valve 34 to be shut off is formed.

In this second embodiment, the overflow prevention valve 30 is mounted at the end of the gas inlet 11 of the gas flow path 13, thereby being located in the neck ring 18 for mounting the discharge valve, and Even in the case where the discharge valve is broken due to a collision, it remains on the pressure-resistant gas container 10 side together with the neck ring 18. The bypass 38 includes a valve body-side bypass 38a formed along the valve body 14 and a valve body-side bypass 38b formed in the valve body 20, and the valve body 20 is seated on the valve seat 15. 3, one end opening of the valve body side bypass 38a and the valve body side bypass 3a as shown in FIG.
8b and one end opening face each other and communicate with each other;
When the valve body 20 moves upward and separates from the valve seat 15, one end opening of the valve body side bypass 38a is closed by a seal packing 39 for opening and closing the bypass 38 provided in the valve body 20, and the valve body side bypass 38a and the valve body side are closed. The bypass 38b is disconnected in a non-communication state. Further, in the second embodiment, one end of the valve body side bypass 38a is opened in the neck ring 18, and the valve body side bypass 38a
The opening inside the neck ring 18 is a small hole 38c with a small diameter.
An orifice 38d having an orifice 38d is formed.
Thus, even if the take-out valve is broken, a large amount of gas leakage does not occur through the valve body side bypass 38a.

Since other parts in the second embodiment are the same as those in the first embodiment, the same parts are denoted by the same reference numerals and description thereof will be omitted.

◎ Third Embodiment FIG. 4 is a sectional view of a main part showing a third embodiment of the present invention.
In the case of showing another form of the bypass for automatic return of the overflow prevention valve, unlike the second embodiment, one end of the bypass 38 has the valve seat 15 of the valve body 14 and the body of the overflow prevention valve 30. An interlocking stem 26 on a ring that moves up and down together with the valve body 20 is attached to the valve body 20, and further, a slide packing is provided around the outer periphery of the interlocking stem 26.
27 is attached, so that the valve body 20 is
When the gas passage 13 is closed by sitting on the valve seat 15, the slide packing 27 attached to the interlocking stem 26 is separated from the opening 38e of the bypass 38 to open it, and the valve body 20 is When the gas passage 13 is opened apart from the valve seat 15 of the valve body 14, the slide packing 27 attached to the interlocking stem 26 comes to the position of the opening 38e of the bypass 38 and closes it. According to the third embodiment, the length of the bypass 38 formed in the valve body 14 can be reduced, and the diameter of the bypass 38 can be reduced.

The other parts in the third embodiment are the same as those in the first and second embodiments, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

◎ Fourth Embodiment FIG. 5 is a sectional view showing a main part of a fourth embodiment of the present invention.
This is a case where a shut-off valve is attached to a conventional extraction valve with an overflow prevention valve. That is, the check valve 34 constituting the overflow prevention valve 30
In this case, a minute hole 34a for returning the check valve 34 to the open position after the operation of the overflow prevention valve 30 is formed.

The other parts in the fourth embodiment are the same as those in the first to third embodiments, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

◎ Fifth Embodiment FIGS. 9 and 10 are a cross-sectional view showing a fifth embodiment of the present invention and a cross-sectional view taken along line X-X of FIG. 9 in order to save energy when the geared motor constituting the opening means is opened. Is the case. That is, the geared motor 44 is
A changeover switch 56 ′ interposed between the geared motor 44 and the shutoff valve body 41 and operating with the rotation of the motor 44, and the changeover switch 56 ′ cuts off and energizes the motor 44. Works when shut off (excitation)
In this case, there is provided a conversion mechanism 54 'comprising a solenoid 55' which is a holding means for holding the shutoff valve element 41 in an open state by overcoming the elastic force of the return spring 47 of the switch selector 51. With this configuration,
When the motor 44 is driven, the switch selector 51 is rotated clockwise against the elastic force of the return spring 47 along with the rotation of the motor 44, and the engagement between the cam 58 and the variable contact 57 is released, so that the changeover switch is switched. 56 'switches to solenoid
When the solenoid 55 'is excited, the clutch plate 73 is guided by a slide guide portion 70 formed at a portion of the clutch plate 71 opposite to the drive shaft 45 of the motor 44 by excitation of the solenoid 55', and the clutch plate 73 is attracted to the solenoid 55 '. The frictional force at the time of this attraction overcomes the elastic force of the spring 47 'and the return spring 47, and the shutoff valve body 41 is held in the open state. Further, if the power supply to the solenoid 55 'is interrupted due to a failure of the drive unit or the like, the clutch plate 73 is separated from the solenoid 55' by the resilience of the spring 47 ', and the elasticity of the return spring 47 causes the shut-off valve body 41. Is switched to the closed position, and the gas flow path is shut off.

Since other parts in the fifth embodiment are the same as those in the first embodiment, the same parts are denoted by the same reference numerals and description thereof will be omitted.

[Effects of the Invention] As described above, according to the extraction valve with the shut-off valve of the present invention, the gas that communicates between the gas intake opening into the pressure-resistant gas container and the gas intake opening toward the forced vaporizer side. A valve body that seats a valve seat on a valve body having a flow path to open and close the gas flow path; an overflow prevention valve that shuts off the gas flow path when the gas flow rate reaches a predetermined value or more; A shut-off valve that shuts off the gas flow path due to a failure or the like.The shut-off valve is provided with a shut-off valve body that opens and closes the gas flow path, and an elastic force to apply the shut-off valve body to a normally closed position. And the opening means actuated by the drive unit to open the shut-off valve body against the elastic force, and to open and close the shut-off valve body with the operation / stop of the drive unit. Since it is formed so as to perform, the following effects can be obtained.

1) An overflow prevention valve that prevents the liquefied gas in the pressure-resistant gas container from flowing into the gas flow path at a predetermined flow rate or more due to a failure of the driving unit, and an emergency shutoff function by shutting off the shutoff valve. Since the dual safety function can be provided, safety can be improved.

2) Since the valve element, the downstream prevention valve, and the shutoff valve can be incorporated in one valve body, the valve body can be manufactured compactly and the space can be effectively used when mounted on a vehicle.

[Brief description of the drawings]

1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional view showing a second embodiment of the present invention, and FIG. FIG. 5 is a sectional view of a principal part showing a third embodiment of the present invention, FIG. 5 is a sectional view of a principal part showing a fourth embodiment of the present invention, and FIGS. FIG. 9 is an electric circuit diagram showing an embodiment, FIG. 9 is a sectional view showing a fifth embodiment of the present invention, and FIG.
FIG. 11 is a sectional view of a main part showing a conventional take-out valve. Description of symbols (10)… Pressure resistant gas container (11)… Gas inlet (12)… Gas outlet (13)… Gas flow path (14)… Valve body (15)… Valve seat (20) ) Valve body (23) Release pin (26) Interlocking stem (30) Overflow prevention valve (34) Check valve (35) Spring (37) Release pin (38) ) Bypass (38a)… Valve body side bypass (38b)… Valve body side bypass (40)… Shutoff valve (44)… Gear motor (46)… Valve stem (47)… Return spring (51) ) Switch selector (52) Battery (53) Alternator (54) Voltage conversion mechanism (54 ') Conversion mechanism (55) Resistor (55') Solenoid (holding means) ) (56) Voltage conversion switch (56 ') Changeover switch (57) Variable contact (58) Cam (70) Clutch Rate

Claims (6)

(57) [Claims] 1. A valve body having a gas passage communicating between a gas inlet opening in a pressure-resistant gas container and a gas outlet opening on a forced vaporizer side, and said gas passage provided in said valve body. A valve body that is removably seated on a valve seat formed therein and opens and closes a gas flow path, and a gas flow rate formed in the gas intake side from the valve body and in the gas flow path is a predetermined value or more. And a shutoff valve formed on the outlet side of the valve body and the overflow prevention valve to shut off the gas flow path due to a failure of a driving unit or the like. The shut-off valve is configured such that a shut-off valve body for opening and closing the gas flow path, a switch selector for urging an elastic force to constantly apply the shut-off valve body to a closed position, and a switch selector for opposing the elastic force. Opening means operated by the drive unit to open the shut-off valve element. Both the opening means shutoff valve with liquefied gas takeout valve, characterized in that for opening and closing of the shutoff valve body by the actuation and stopping of the drive unit. 2. A release pin protrudes from the seat surface side of the valve body toward the overflow prevention valve, and an opening pin protrudes from the seat surface side of the overflow prevention valve toward the valve body. The liquefied gas discharge valve with a shut-off valve according to claim 1, wherein the release pin and the release pin are engaged when the valve body is seated on the valve seat to open the overflow prevention valve. 3. The valve body between a closed space in a gas flow path partitioned by the valve body and the overflow prevention valve when the valve body is seated on a valve seat and the inside of the pressure-resistant gas container. A bypass for returning from an overflow prevention valve that communicates between the closed space and the inside of the pressure-resistant gas container when the valve is seated on the valve seat, and is shut off when the valve body is separated from the valve seat. 2. A liquefied gas discharge valve with a shut-off valve according to claim 1, wherein said valve is formed with: 4. A valve stem having a switch selector integrated with a valve body and connected to a shutoff valve body, and an opening means mounted outside the valve body and connected to the valve stem. The liquefied gas discharge valve with a shut-off valve according to claim 1, wherein the valve is configured. 5. A motor, wherein the shutoff valve constitutes an opening means;
A voltage changeover switch that is interposed between the motor and the shutoff valve body and that switches to a pressure reducing position that reduces the load on the motor within a range where the elastic force can be overcome from the normal voltage position by rotation of the motor. 5. A liquefied gas discharge valve with a shut-off valve according to claim 1, further comprising a voltage conversion mechanism. 6. A motor, wherein the shut-off valve constitutes an opening means;
A changeover switch that is interposed between the motor and the shutoff valve body and that operates in accordance with the rotation of the motor; 5. A liquefied gas take-out valve with a shut-off valve according to claim 1, further comprising a conversion mechanism comprising a holding means for holding the shut-off valve body in an open state by overcoming the problem.