JPH10196896A - Charge-dedicated gas container valve with overcharge checking function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the safety and efficiency of the charging work of a charge-dedicated gas container valve, by simplifying its structure, providing it with an overcharge checking function, and allowing its attachment or detachment in a single operation. SOLUTION: A charge-decorated gas container valve involves an overcharge check valve 10, taking the form of a ball arranged in a gas passage to close its gas passage portion on the side of a gas charge port, which is driven by a float adapted to vertically move corresponding to the liquefied gas level. The gas pipe connection of the gas container valve comprises a gas pipe-side connection 30 and a valve-side connection 3 conforming to the gas pipe-side connection, when are respectively provided with valves 35 and 5 for opening or closing the gas passage. The valves 5 and 35 are normally energized by their associated springs 38 and the like in the directions to close the gas passage, and only during the connections are coupled together, they are automatically opened when pressed by the tip 36a of a rod 36 penetrating through the valve 35 on the valve 5 to open the gas passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas container valve, and more particularly to a filling gas container valve having an overfilling prevention function suitable for performing gas filling in a place where LP gas is used.

[0002]

2. Description of the Related Art Conventionally, a valve attached to an inlet / outlet of a high-pressure gas container such as an LP gas container has been required to be capable of performing ordinary operations such as gas filling, residual gas recovery, and gas blow test without any trouble. Those that satisfy these conditions are widespread. In order to further enhance safety, a device having a function of preventing a discharged gas from overflowing and a device capable of coping with a disaster such as an earthquake have been proposed. The above-mentioned general work is mainly performed at a specific work base equipped with various facilities and equipped with a fully automatic filling facility. The conventional gas container valve for discharging gas when using gas (gas passage opening / closing valve, (With only a safety valve attached) is used as it is during gas filling.

[0003] LPs mounted on automobiles as fuel
The injection of gas into the gas tank must be performed at a location other than the specific work station.
Although it is necessary to perform gas filling with a simple facility such as a P gas stand, it is dangerous to inject gas more than a specified volume because thermal expansion may result in operation of the safety valve. Careful attention is required, especially when charging taxi fuel. To prevent these dangers, overfilling prevention devices have been proposed.

[0004]

In most cases, the supply of LP gas to gas consumers, including general households, currently transports filled gas containers and replaces them with used gas containers at consumers. However, replacing heavy gas containers is hard work, and recently, in order to improve work efficiency, instead of replacing such gas containers, there is a tendency to request gas filling at customer sites (so-called eaves filling). Increasing.

However, the conventional LP gas container is provided with a gas supply container valve, a gas passage opening / closing valve, a safety valve corresponding to an abnormal pressure, and the like, and has a function of preventing the discharge gas from flowing out. No function is added to prevent overfilling during gas filling. Therefore, in order to perform eaves filling, a gas container valve is required that enables anyone to perform gas filling safely and efficiently. Considering economics,
Although one gas container valve may serve both as discharge and gas filling for gas consumption, even if the customer is consuming gas,
In order to perform gas filling without interrupting its use, it is better to have a valve dedicated to filling in addition to a valve for gas supply.

An object of the present invention is to solve such a problem and to provide a container valve for exclusive use of filling to be attached to the same container in addition to a conventional container valve, while having a function of preventing overfilling, having a simple and inexpensive structure. An object of the present invention is to provide a filling gas container valve with an overfilling prevention function, which has high gas filling work safety and work efficiency.

[0007]

In order to solve the above-mentioned problems, a filling gas container valve with an overfilling prevention function according to the present invention comprises a valve for opening and closing a gas passage, and the gas passage connected to a gas container. In a gas container valve having a gas container coupling portion to be connected and a gas pipe coupling portion connecting the gas passage to a gas pipe for gas filling, an over-gas valve provided in the gas passage to prevent over-filling when performing gas filling. A filling prevention valve, and an overfilling prevention valve driving unit that opens and closes the overfilling prevention valve by using a float that moves up and down as the liquid level of the liquefied gas in the gas container moves as a driving source, Consists of a gas pipe-side connection part attached to the end of the gas pipe to be connected, and a valve-side connection part corresponding to the gas pipe-side connection part,
A valve for opening and closing a gas passage is provided in each of the gas pipe side connection part and the valve side connection part, and the gas pipe connection part and the valve side connection part cooperate automatically only when the two connection parts are in a connected state. The valve is opened to open the gas passage.

In order to achieve the above object, the overfilling prevention valve is specifically provided with a ring-shaped protrusion formed to protrude inside the inner wall of the gas passage in order to narrow the gas passage and the protrusion. A ball that can close the central gas passage from the gas filling port side, the overfilling prevention valve opening / closing means is a float that moves up and down following the movement of the liquefied gas liquid level in the gas container, A rod coupled to the ball, one end of which is connected to the end of the rod opposite the ball,
The other end comprises a lever connected to the float, and when stopping the gas passage with the vertical movement of the float, the ball comes into contact with the ring-shaped protrusion to close the gas passage portion and allow the gas passage. In the case of causing the ball to separate from the ring-shaped protrusion and open the gas passage portion, the valve built in the gas pipe coupling portion is normally urged by a spring in the direction to close the gas passage, When the valve-side connecting portion and the gas pipe-side connecting portion are in a connected state, a protrusion interlocking with one of the valves of the both connecting portions hits the other valve to keep the distance between the valves of the two connecting portions constant. Thereby, each of the valves of the two joints, which were energized and closed before the joint, is simultaneously opened to form a gas passage.

According to another aspect of the present invention, there is provided a filling gas container valve provided with an overfilling prevention function, comprising: a valve for opening and closing a gas passage; and a gas container for connecting the gas passage to the gas container. In a gas container valve having a coupling portion and a gas pipe coupling portion connecting the gas passage to a gas pipe for gas filling, an overfilling prevention valve provided in the gas passage to prevent overfilling when performing gas filling. And an overfilling prevention valve driving unit that opens and closes the overfilling prevention valve by using a float that moves up and down with the liquid level movement of the liquefied gas in the gas container as a drive source, wherein the gas pipe coupling unit includes A gas pipe end coupled to a high-pressure gas pipe to be coupled to a container valve, the gas pipe end being provided with a valve that opens and closes the gas passage; And combined state Sometimes only automatically opens the valve in cooperation with said combiner configured to open the gas passage.

[0010] To achieve the above object, the overfilling prevention valve is specifically provided with a ring-shaped protruding portion formed to protrude inside the inner wall surface of the gas passage to narrow the gas passage, and the protruding portion. A ball that can close the central gas passage from the gas filling port side, the overfilling prevention valve opening / closing means is a float that moves up and down following the movement of the liquefied gas liquid level in the gas container, and A rod connected to the ball, and one end connected to the end of the rod on the opposite side of the ball and the other end connected to the float, which stops gas passage as the float moves up and down. In the case, the ball is in contact with the ring-shaped protrusion and closes the gas passage, and when allowing gas passage, the ball is configured to open the gas passage apart from the ring-shaped protrusion,
The valve incorporated in the gas pipe joint is normally urged in a direction to close the gas passage by a spring, and when the coupler at the end of the gas pipe to be joined and the gas pipe joint are in a joined state. A valve provided at the center of the valve of the coupler or the gas pipe coupling portion hits an opposing valve and opens both gas valves which are biased and closed before coupling to open a gas passage. It is configured to be formed.

[0011]

Next, an embodiment of the present invention will be described.
This will be described in detail with reference to the drawings. FIG. 1 is a front view (cross-sectional view) showing an embodiment of the present invention together with a part of its related parts. However, the overfilling prevention valve is shown by a solid line when it is closed, and a part of the valve is opened by a two-dot chain line.
A part of the overfill prevention valve driving means and a part of the gas pipe connection part are omitted. FIG. 2 shows A of the example embodiment of FIG.
It is sectional drawing in -A. FIG. 3 is a sectional view taken along line BB of the embodiment of FIG.

In FIG. 1, reference numeral 1 denotes a valve body, which is screwed into a female screw 4a at the entrance of a gas cylinder 4 by a male screw 1a for connecting a gas cylinder. 2 is a gas passage in the valve body 1. Reference numeral 3 denotes a valve-side coupling portion (hereinafter, referred to as a male filling member) coupled to a gas-tube-side coupling portion (hereinafter, referred to as a female female fitting for filling) 30 coupled to the gas high-pressure hose pipe for filling. . In the embodiment of FIG. 1, a pair of the male fitting for filling 3 and the female fitting for filling 30 constitutes a gas pipe joint. In the present embodiment, the filling female fitting 30 is included in the components of the gas pipe connecting part. However, the gas pipe connecting part is constituted only by the filling male fitting 3, and the filling female fitting 30 is used instead of the filling female fitting 30. , From among the ready-made products,
Equivalent (can be attached to the end of gas high pressure hose pipe,
One of a pair of couplers that automatically opens the valve simultaneously with coupling may be selected and used. However, it is desirable to minimize the amount of gas released when the metal fitting is removed (2 to 3 cc or less).

The filling metal fitting 3 has a thick cylindrical shape and is formed as a part of the valve body. A ring-shaped recess 3a for regulating the position of the O-ring 9 for maintaining the airtightness with the filling female metal fitting 30 when it is connected to the lock ball 33 provided on the filling female metal fitting 30. A ring-shaped depression 3b for locking the coupling state is provided. Reference numeral 5 denotes an on-off valve for shutting off the gas passage 2 (hereinafter, referred to as a valve-side on-off valve), which is provided inside the male fitting 3 for filling. The valve-side on-off valve 5 has a rod 6 attached to the back surface, and is supported on the inner surface of the valve body 1 by an on-off valve support portion 7 so as to be able to advance and retreat toward the gas inlet 1a of the valve body. In normal times (when gas filling is not performed), it is urged by the spring 8,
The gas inlet 1a is closed from the inside.

FIG. 4 is an explanatory view showing the filling male fitting 3 and the filling female fitting 30 in a connected state. Reference numeral 31 denotes a body of the filling female metal fitting 30, which is formed in a stepped thick cylindrical shape. A gas pipe contact portion 31d extending slightly toward the gas pipe side with a slightly thin cylindrical shape is provided with the stepped portion (hereinafter referred to as a shoulder portion) 31c as a boundary. The outer surface of the gas pipe contact portion 31d is tapered so that it can be easily inserted inside the gas pipe. Reference numeral 32 denotes a fastening fitting for further fastening and fixing the high-pressure gas pipe 40 fitted from the outside of the gas pipe contact portion 31d from the outside. The tapered tapered portion of the gas tube contact portion 31d may be provided with several steps which are not particularly shown, but which are not shown, and which make it difficult for the inserted gas tube to come off.

The filling metal fitting 30 has a ring-shaped flange 31e projecting inward from the shoulder 31c near the center of the inside of the thick cylindrical portion 31b opposing the filling male fitting 3. Reference numeral 35 denotes an on-off valve that shuts off a gas passage inside the cylindrical portion (hereinafter, referred to as a gas pipe-side on-off valve), and is provided in an internal space between the flange 31e and the shoulder 31c. The gas pipe side opening / closing valve 35 is provided with a rod 36 penetrating from the back surface to the front surface, and is capable of moving forward and backward toward the inner gas passage portion 31a surrounded by the flange 31e. Are supported by an on-off valve support portion 37. In normal times (when gas filling is not performed), the gas is urged by the spring 38 to close the gas passage portion 31a from the inside.

Reference numeral 33 denotes a lock ball provided on the filling female fitting 30 for locking the connected state. The lock ball 33 projects inward by a spring 34 whose outer end is regulated by a set screw 39. However, the lock ball 33, the spring 34
Is formed so that the lock ball 33 does not fall out inside. The thick cylindrical portion 31b
The inner surface of the lock ball 33 is connected to the
Is tapered so as to spread toward the opening surface so as not to damage the O-ring 9 of the male fitting 3 for filling. Along this, the outer surface of the thick cylindrical portion 31b is also tapered.

When gas is passed from the high-pressure pipe side to the valve side for gas filling, as shown in FIG. 4, the filling male fitting 3 is inserted into the opening of the thick cylindrical portion 31b of the filling female fitting 30. , Just insert it as far as it will go. At this time, the distance between the valve-side on-off valve 5 and the gas-tube-side on-off valve 35 at the portion of the rod 36 of the gas-tube-side on-off valve 35 protruding toward the valve side is regulated so as not to be less than a certain value. That is, the rod 36
When the distal end portion 36a pushes the valve-side on-off valve 5, the urging by the spring 8 closing the valve-side on-off valve 5 and the gas pipe-side on-off valve 35 and the urging by the spring 38 are opposed. Open the gas passage at the same time.

Reference numeral 10 denotes an overfilling prevention valve for preventing overfilling during gas filling. The overfill prevention valve 10 is ball-shaped, and the lower end thereof is connected to the upper end of a vertical rod 18 for moving the overfill prevention valve 10 up and down. Reference numeral 20 denotes a rod guide tube which supports the rod 18 so as to be slidable in a vertical direction. Top 20a of rod guide tube 20
Has a flared flange formed inside the cylinder. The hole at the center of the flange is closed by the spherical surface at the bottom of the overfilling prevention valve 10 when overfilling of gas is prevented.

FIG. 5 is an explanatory view (cross-sectional view) showing the entire driving structure of the overfilling prevention valve 10 of FIG. The driving source of the overfill prevention valve 10 is a position of the liquid level of the liquefied gas (L shown in the figure).
a, Lb, etc.). One end of a horizontal lever 16 is attached to the float 15. The horizontal lever 16 is swingably supported by a fulcrum 17 near the lower end of the rod guide cylinder 20. A lower end 18 b of a vertical rod 18 is swingably connected to the other end of the horizontal lever 16.

Inside the rod guide tube 20, two upper and lower
Guide plates 20b, 20c with small holes in the center
Is provided, and the vertical rod 18 is provided with a guide plate 20b,
The small hole of 20c slides freely. A spring 21 is inserted between the bottom surface of the overfill prevention valve 10 and the upper guide plate 20b, and urges the overfill prevention valve 10 to be separated from the top 20a of the rod guide 20.
A small protrusion 19 is provided at a position slightly lower than the lower guide plate 20c of the vertical rod 18,
The upper limit of the vertical rod 18 is restricted. Therefore, the upper limit position of the overfill prevention valve 10 is determined by the position where the protrusion 19 hits the guide plate 20c. In addition, 20e,
20e, 20e, 20e are holes through which gas passes through the inside and outside of the rod guide cylinder 20.

Next, the state of the gas filling process and the operation of the overfill prevention valve 10 will be described. The gas filling operation (so-called eaves filling operation) at a gas container installation place for gas supply is performed in a state where gas is used to some extent and the remaining amount of gas in the gas container is small. Therefore, the liquid level of the liquefied gas is low, for example, at the position of Lb in FIG. Therefore, the force of the liquid surface pushing up the float 15 is weak, and the float 15
Of its own weight. The vertical rod 18 is pushed up via the horizontal lever, and stops at the guide plate 20c when the protrusion 19 rises to the position 19b as shown by the two-dot chain line in the figure. The overfill prevention valve 10 is also at the highest position as shown by the two-dot chain line in the figure.

In this state, as shown in FIG. 4, when the filling male fitting 3 and the filling female fitting 30 are connected and a gas to be filled, such as LP gas, is sent from the high-pressure gas pipe 40 at a high pressure, the gas becomes Inside of the gas pipe contact portion 31d of the filling metal fitting 30,
The hole 34a of the on-off valve support portion 34, the periphery of the gas pipe side on-off valve 35, the gas passage hole 31a, the gas inlet 1 of the male fitting 3 for filling.
a, around the valve-side on-off valve 5, the hole 7 in the on-off valve support 7
a, The gas passes through the periphery of the overfill prevention valve 10 and fills the inside of the gas cylinder body 9. The gas passage at this time is indicated by an arrow in FIG.

The liquid level of the liquefied gas in the container gradually rises, and reaches the position La from the position Lb in FIG.
5, the buoyancy increases and the vertical rod 18 is pulled down via the horizontal lever 16, and the overfill prevention valve 10 lowers against the repulsive force of the spring 21, and the overfill prevention valve 1
The lower surface of O closes the hole of the top 20a of the rod guide cylinder 20. Therefore, gas filling that further raises the liquid level from the position of the liquid level La is completely prevented. After filling until the liquefied gas liquid level reaches the specified position La indicated by the solid line in FIG.
When the female filling metal fitting 30 is separated from the male filling metal fitting, the valve-side on-off valve 5 and the gas pipe-side on-off valve 35 are simultaneously closed. The gas leakage at this time is extremely small (2 to 3 cc or less) and can be ignored and there is no danger.

In the embodiment shown in FIGS. 1 to 5, the filling male fitting 3 is a male connecting part and the filling female fitting 30 is a female connecting part. Various modifications can be considered for the combination of the coupling portions and the respective structures. With respect to the embodiment, the combination of the male type and the female type is reversed, and the valve-side coupling portion is a female type,
The gas pipe side connection may be male. For example, FIG.
In one example, the valve-side connecting portion 43 and the gas-tube-side connecting portion 60 are used.
FIG. 4 is an explanatory view (cross-sectional view) shown in a combined state.

In FIG. 6, reference numeral 45 denotes a valve side opening / closing valve. 46 is a rod penetrating the valve-side on-off valve 45. Reference numeral 47 denotes an on-off valve supporting portion for supporting the valve-side on-off valve 45 so as to be able to move forward and backward. A spring 48 biases the valve-side on-off valve 45 in a closing direction. Reference numeral 49 denotes a lock ball for locking the connection between the gas pipe side connection portion 60 and the valve side connection portion 43. Reference numeral 65 denotes a gas pipe side on-off valve. 66 is a rod attached to the back of the gas pipe side on-off valve. Reference numeral 67 denotes an on-off valve support for supporting the gas pipe-side on-off valve 65 so as to be able to move forward and backward. 68 is a gas pipe side on-off valve 6
5 is a spring that urges 5 in the closing direction. Reference numeral 69 denotes an O-ring for maintaining the airtightness between the gas pipe side connecting portion 60 and the valve side connecting portion 43 at the time of connection.

In the example shown in FIG. 6, as compared with the embodiment shown in FIGS.
Instead of tapering the cylindrical portion of the female valve-side coupling portion 43, the inner surface of the valve-side coupling portion 43 is formed into a stepped cylindrical shape having a large diameter on the opening side, and the gas pipe-side coupling portion 6 opposed thereto is formed.
0 has a stepped cylindrical shape with a small diameter on the tip side. This also eliminates the risk of the lock ball 49 damaging the O-ring 69 when inserting and removing the two connecting portions.

The explanatory diagram (cross-sectional view) of FIG. 7 shows that the combination of male and female shapes is the same as that of the embodiment of FIGS. 1 to 5, but the lock structure for maintaining the connected state is not based on the lock ball.
This is an example in which a lock position and an airtight holding position by an O-ring are arranged in reverse with respect to a connecting direction of both connecting portions. However, in FIG. 7, the valve side connecting portion 53 and the gas pipe side connecting portion 70 are shown in a separated state.

In FIG. 7, reference numeral 53b denotes a ring-shaped groove into which the lock fitting 73 is fitted when both connecting portions are in the connected state. 55 is a valve-side on-off valve. Reference numeral 56 denotes a rod that passes through the valve-side on-off valve 55. Reference numeral 57 denotes an on-off valve supporting portion for supporting the valve-side on-off valve 55 so as to be able to move forward and backward. Reference numeral 58 denotes a spring that biases the valve-side on-off valve 55 in a closing direction. 59 is a valve side connecting portion 53 at the time of connection.
And an O-ring for keeping the gas pipe side joint 70 airtight. Reference numeral 75 denotes a gas pipe side on-off valve. 76 is a rod that penetrates the gas pipe side on-off valve 75. Reference numeral 77 denotes an on-off valve supporting portion that supports the gas pipe-side on-off valve 75 so as to be able to move forward and backward. Reference numeral 78 denotes a spring that urges the gas pipe side on-off valve 75 in a closing direction.

The lock fitting 73 is a ring-shaped notch made of a highly elastic metal, or an elliptical shape close to a circle, which is pushed out from the inside and finally has a ring-shaped groove 5.
What is necessary is just what fits into 3b. The lock fitting 73 is fitted with a play in a groove provided on the inner cylinder surface of the gas pipe side coupling portion 70. In such a structure, since the airtightness is completely maintained at a position where the lock structure is provided, there is no problem even if the lock is performed at a position closer to the portion where the gas passages of the two joint portions are butted than the position of the O-ring. . By doing so, the lock metal 73 does not come into contact with the O-ring 59 at the time of connection and detachment, so that the O-ring 59 is not damaged at all.

However, in consideration of usability, manufacturing problems, performance, etc., those shown in FIGS. 1 to 4 are considered suitable for general use. In any case, as a measure to prevent gas leakage and adhesion of rainwater, dust, etc., as shown in FIG. 8, safety is further increased by always putting a safety cap 41 on the inlet of the valve side coupling portion. Can be.

[0031]

As described above in detail, according to the present invention, a gas passage in a gas container valve is provided with an overfilling prevention valve for preventing overfilling in the case of gas filling. By opening and closing the overfill prevention valve with a float that moves up and down as the liquid level rises and falls, a highly safe overfill prevention function is obtained with a simple structure, and when it is connected to a hose fitting for gas filling. Only by incorporating an on-off valve that automatically opens the gas passage, there is an effect that the gas filling operation at the gas cylinder installation site can be performed extremely efficiently.

[Brief description of the drawings]

FIG. 1 is a front view (sectional view) showing an example of an embodiment of the present invention.
FIG.

FIG. 2 is a plan view showing a cross section taken along the line AA of the embodiment of FIG. 1;

FIG. 3 is a plan view showing a cross section taken along line BB of the embodiment of FIG. 1;

FIG. 4 is an explanatory diagram (cross-sectional view) showing a coupling relationship between the coupling portion and the gas high-pressure tube in the embodiment of FIG. 1;

FIG. 5 is an explanatory view (cross-sectional view) showing the entire drive structure of the overfilling prevention valve of FIG. 1;

FIG. 6 is an explanatory view (cross-sectional view) showing a part of a coupling portion according to another embodiment.

FIG. 7 is an explanatory view (cross-sectional view) showing a part of a connecting portion according to still another embodiment.

FIG. 8 is an explanatory view (cross-sectional view) in which a safety cap is attached to a filling port of the container valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 2 Gas passage 3 Filling metal fitting 4 Gas cylinder 5, 45, 55 Valve side on-off valve 6, 36, 46, 56, 66, 76 Rod 7, 37, 47, 57, 67, 77 On-off valve support part 9 , 59, 69 O-ring 10 Overfill prevention valve 15 Float 16 Horizontal lever 18 Vertical rod 20 Rod guide 30 Filling metal fitting 33, 49 Lock ball 35, 65, 75 Gas pipe side opening / closing valve 40 High pressure hose pipe for filling 41 Safety Cap 73 Lock fitting

Claims (4)

[Claims] 1. A gas container having a valve for opening and closing a gas passage, a gas container coupling portion connecting the gas passage to a gas container, and a gas pipe coupling portion connecting the gas passage to a gas pipe for filling gas. In the valve, an overfilling prevention valve provided in the gas passage to prevent overfilling when performing gas filling, and a float that moves up and down with a liquid level movement of the liquefied gas in the gas container as a driving source, An overfill prevention valve driving means for opening and closing the overfill prevention valve, wherein the gas pipe coupling portion corresponds to a gas pipe side coupling portion attached to an end of a gas pipe to be coupled and the gas pipe side coupling portion. A valve for opening and closing a gas passage in each of the gas pipe side connection part and the valve side connection part, and the gas pipe connection part and the valve only when both the connection parts are in a connected state. Side joints work together automatically A filling gas container valve with an overfilling prevention function, characterized in that the valve is opened and the gas passage is opened. 2. An overfilling prevention valve includes a ring-shaped protrusion formed by projecting inside a gas passage inner wall surface in order to narrow a gas passage, and a gas passage portion in the center of the protrusion formed on a gas filling port side. An overfilling prevention valve opening / closing means includes a float that moves up and down following the movement of the liquefied gas liquid level in the gas container, a rod connected to the ball, and one end of the ball. And a lever connected to the end of the rod opposite to the other end and the other end connected to the float. When stopping the gas passage along with the vertical movement of the float, the ball is the ring-shaped protrusion. In order to close the gas passage portion by contacting with the gas passage portion and allow the gas passage, the ball is separated from the ring-shaped protrusion to open the gas passage portion. Spring by spring When the valve is urged in a direction to close the passage and the valve-side connecting portion and the gas-tube-side connecting portion are in a connected state, the protrusion interlocking with one of the valves of the two connecting portions hits the other valve and 2. The valve according to claim 1, wherein by keeping the distance between the valves of the two joints constant, each of the valves of the two joints that have been energized and closed before the joint is simultaneously opened to form a gas passage. Filling gas container valve with overfill prevention function. 3. A gas container having a valve for opening and closing a gas passage, a gas container connecting portion connecting the gas passage to a gas container, and a gas pipe connecting portion connecting the gas passage to a gas pipe for filling gas. In the valve, an overfilling prevention valve provided in the gas passage to prevent overfilling when performing gas filling, and a float that moves up and down with a liquid level movement of the liquefied gas in the gas container as a driving source, An overfill prevention valve driving means for opening and closing the overfill prevention valve, wherein the gas pipe coupling portion corresponds to a coupler at the end of a gas pipe attached to a high pressure gas pipe to be coupled to a gas container valve. A valve that can be connected and opens and closes the gas passage, and automatically opens the valve in cooperation with the coupler to open the gas passage only when the gas pipe coupling portion is in a coupled state with the coupler. That it is configured to be open A gas container valve for filling with an overfilling prevention function. 4. An overfilling prevention valve includes a ring-shaped protrusion formed by projecting inside a gas passage inner wall surface in order to narrow a gas passage, and a gas passage portion at the center of the protrusion formed on a gas filling port side. An overfilling prevention valve opening / closing means includes a float that moves up and down following the movement of the liquefied gas liquid level in the gas container, a rod connected to the ball, and one end of the ball. The other end of the rod is connected to the end of the rod, and the other end is connected to the float. The float is moved up and down. When contacting and closing the gas passage and permitting gas passage, the ball is separated from the ring-shaped protrusion to open the gas passage, and the valve built in the gas pipe coupling is always a spring. By gas When the coupler at the end of the gas pipe to be coupled and the gas pipe coupling section are in a coupled state, being urged in a direction to close the path, the valve of the coupler or the valve of the gas pipe coupling section is closed. 4. An overfill prevention device according to claim 3, wherein the projection provided at the center hits the opposing valve and opens the two opposing valves which were urged and closed before coupling to form a gas passage. Filling gas container valve with function.