JPH10122497A - Gas release preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent gas release by retreating a protruding part, provided at the tip of an insert cylinder part, into a second valve chamber from a first valve chamber when a rubber hose is pulled to retreat an operating cylinder, and retreating a movable valve by the spring force of a valve spring to close a valve hole. SOLUTION: When a rubber hose 68 is pulled to retreat an operating cylinder 42, a protruding part 46 pressing a movable valve 30 in a first valve chamber 21 is pulled into a second valve chamber 23, and the movable valve 30 closes a valve hole 19 by the spring force of a valve spring 40. When an inner step part 56 of a sliding cylinder 51 is hooked to a locking piece 18, the upper part of a ball 53 is engaged with a recessed groove 62 of an outer body 60, and the lower part of the ball 53 is positioned at the peripheral surface of a small diameter part 16 of a valve body. The operating cylinder 42, outer body 60 and sliding cylinder 51 are respectively impeded in movement toward the valve hole 19 by the spring force of second springs 67, 66. The closed state of the valve hole 19 is thereby maintained to prevent gas release.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing gas emission from being attached to a high-pressure gas, especially a propane gas container.

[0002]

2. Description of the Related Art High-pressure gases such as flammable gas, combustible gas, and toxic gas may cause fire or explosion if they flow into the atmosphere in large quantities. Therefore, in addition to the regulator, a gas release prevention valve is attached to the container valve of the gas container filled with these gases to ensure safety. In particular, the container valve of a household propane gas container is designed to prevent secondary disasters caused by tilting or overturning of the container due to an earthquake during gas use or external impact,
There are a wide variety of outgassing devices. Among them, for example, Japanese Utility Model Laid-Open No. 7-25376 shown in FIG. 1 is known as one which operates a valve for preventing gas release by utilizing the weight of the container when the container is inclined or falls.

[0003] A safety device 1 for preventing outgassing includes a valve box 2
In this structure, the other end of a cable 9 whose one end is inserted into a rubber hose 8 having one end fixed to a joint 7 is connected to a suspension ring 4 attached to one end of a valve body 3 housed inside. In this case, if the container (not shown) is inclined or falls, the valve box 2
Since the rubber hose 8 connecting the cable and the joint 7 is pulled, the cable 9 inserted into the rubber hose 8 is also pulled at the same time, and the valve 3 connected to one end of the cable is pulled.
However, the valve seat 5 provided on the valve box 2 is closed by the pulling force of the cable to prevent gas release.

[0004]

As described above, when the container is inclined or falls, the valve body 3 is pulled through the cable 9 to close the valve seat 5, but the inclined container is raised. When the cable 9 is returned to the original state or the tension of the cable 9 is loosened, the valve closing force of the valve body 3 that closes the valve seat 5 is loosened, and gas may flow out. The cable 9 inserted into the rubber hose 8 is weakened by the influence of the high-pressure gas in the container or deteriorated due to aging, and is cut off by the inclination of the container or the shock at the time of falling, and the valve body 3 operates. There was a risk of disappearing.

SUMMARY OF THE INVENTION It is an object of the present invention to maintain the operating state of a valve element which has been operated by pulling a rubber hose due to a fall of a container, thereby preventing gas release.

[0006]

According to the present invention, a movable valve is provided in the first valve chamber of a valve body in which a first valve chamber is formed in one of the valve ports provided therein and a second valve chamber is formed in the other. A first end of the first valve chamber is accommodated by being urged toward the valve port by a spring and having a seal ring mounted on the outside and a check valve port provided at a rear end of a through hole provided at the center. The second valve chamber accommodates an insertion cylinder portion formed at a front portion of an operation cylinder having a passage therein and provided with a protruding portion at a distal end, and a distal end peripheral surface outside the second valve chamber. And a slide cylinder having a plurality of balls loosely fitted therein, and an outer body having a concave groove and a pressing surface on a front inner surface and having a rear end fixed to a flange provided on the operation cylinder on the outside of the slide cylinder. A second spring is resiliently inserted between the flange of the operating cylinder and a locking piece attached to the rear end of the valve body, and slides with the outer body. Made by resilient spring between the cylinder,
When the ball engages with the locking groove of the valve body, the protruding portion of the operating cylinder comes into contact with the rear end of the movable valve and moves forward to open the valve port, and the rubber hose is pulled and the operating cylinder is pulled. When the ball is retracted, the ball moves and moves from the locking groove of the valve body to the concave groove of the outer body, and the protrusion provided at the tip of the insertion tube portion is retracted from the first valve chamber to the second valve chamber. The movable valve is retracted by an elastic force of a valve spring to close a valve port. Therefore, the valve body is fixed by the ball loosely fitted to the slide cylinder to open the valve port, and the fixing of the valve body is released by the slide of the operating cylinder, and at the same time, the valve port is closed by the movable valve. The return of the working cylinder is prevented by the elastic force of the second spring, and the closed state of the valve port can be maintained even if the tensile force of the rubber hose is loosened.

Further, according to the present invention, a connecting cylinder is attached to a connecting portion provided on one side via a step provided in a cylindrical valve main body, and a taper is provided at the center in a valve chamber provided on the other side of the step. Par
A second valve chamber is formed through the portion, a seal ring is mounted between flange portions provided at the tip of a body portion formed entirely in a columnar shape,
The ball is spring-resiliently inserted into a ball hole provided in the middle part of the outer periphery of the body, and is loosely fitted. A guide groove is provided on the opposite side of the ball hole, and the other end of the body is provided. An actuating body provided with a connecting part for connecting a rubber hose to the body, a passage closed at one end formed inside the body, and a communicating passage connected at a right angle to the passage at an inner end of the passage. Through the valve chamber of the valve body,
The body of the operating body is inserted into the passage of the locking cylinder whose one end is connected to the valve body, and is resiliently spring-loaded. At substantially one side of the locking cylinder, a direction perpendicular to the axial direction of the operating body. An engaging portion is attached to the engaging cylinder via a spring, and a guide pin for engaging in the guide groove of the operating body is provided on the engaging cylinder opposite to the engaging portion, and the operating body is retracted by being pulled toward the connecting portion. Then, the seal ring of the operating body moves into the second valve body of the valve body to prevent the gas from flowing out excessively, and the ball of the operating body is locked by the locking portion to fix the operating body. It is characterized by the following. Accordingly, the operating cylinder inserted into the valve chamber of the valve body is resiliently opened by a spring to open the valve cylinder portion, and when the operating cylinder retreats, the ball of the operating cylinder fits into the locking portion of the connection cylinder, and at the same time, The collar of the working cylinder moves into the valve barrel of the valve body to close the valve port, and at the same time, prevents the return of the operating cylinder and keeps the valve port closed.

According to the present invention, a through hole is provided at the center of a wall provided at one side end of a cylindrical valve body, a connection portion is provided at one of the through holes, and a housing chamber is provided at the other, respectively. A cylindrical connecting tube having a seal ring at one end is attached to the connecting portion, and a valve body provided inside the connecting tube is provided with a valve body and a seal ring mounted at the tip of the valve body. The valve body to be closed is accommodated, the rear end of the valve body is projected from the through hole into the accommodation chamber, and the operating cylinder housed by being spring-loaded in the accommodation chamber is connected and mounted. A reset cylinder is inserted between the outer periphery of the spring cylinder and a concave portion of the support cylinder attached to the accommodation chamber side of the valve body, and the reset cylinder is inserted into the surface of the spring cylinder with the reset cylinder. The operating cylinder is retracted when the hose connected to the connection of the operating cylinder is pulled. At the same time, the valve body slides rearward, the seal ring of the valve body comes into close contact with the valve cylinder to close the passage, and the spring portion of the spring cylinder attached to the operating cylinder engages with the locking flange of the support cylinder. The operating cylinder is fixed by fitting to the portion. Therefore, the operating cylinder is resiliently resilient by a spring housed in the valve body, the communication hole of the valve body in the connecting cylinder is opened outside the valve cylinder, and the operating cylinder is pulled to one side by the tensile force of the hose. Then, one of the communication holes of the valve body connected to the operating cylinder moves into the valve cylinder to close the passage, and at the same time, the spring portion of the spring cylinder attached to the body of the operating cylinder is in the recess of the support cylinder. By fitting and fixing, the automatic return of the working cylinder can be prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. A first embodiment of the present invention will be described with reference to FIGS. 2 to 5. The first gas release preventing device 11 is formed in a cylindrical shape. A step portion 13 is provided on an outer periphery of an intermediate portion of the valve body 12,
A large diameter portion 14 is provided in front of the step portion, and a small diameter portion 16 is provided in the rear portion. A large-diameter locking flange 15 is attached to the end of the large-diameter portion 14.
A locking groove 17 is formed in the outer periphery of the intermediate portion of the small diameter portion 16 in the circumferential direction, and a locking piece 18 is attached to the rear end of the small diameter portion.

A valve seat 20 having a valve port 19 is provided in the middle of the valve body, and a first valve chamber 21 is formed in the large-diameter portion 14 provided in front of the valve port. A second valve chamber 23 is provided in the small-diameter portion 16 provided at the rear of 19. On the outer peripheral surface of the connection tube 25 loosely fitted on the outer periphery of the large diameter portion 14, an outer screw portion 26 for connecting a container valve and a square-shaped fastening portion 27 are provided.

A plurality of grooves 32 are provided in the longitudinal direction on the outer peripheral surface of the movable valve 30 housed in the first valve chamber 21, and seal rings 33 are mounted on both front and rear ends of the movable valve.
A check valve port 37 is provided at the rear end of a through hole 36 provided at the center of a distal end cylinder 35 attached to the distal end opening of the valve chamber 21, and a seal ring 38 is mounted on the outer surface of the distal end surface. Reference numeral 40 denotes a valve spring that is resiliently accommodated between the rear end of the distal end cylinder 35 and the movable valve 30, and constantly biases the movable valve 30 toward the rear valve port.

An insertion tube portion 44 is provided in front of a flange 43 provided on an intermediate outer periphery of an operation tube 42 having a passage therein. The insertion tube portion 44 is accommodated in the second valve chamber 23. A small-diameter connecting cylinder 49 is formed via the locking step 50. A protruding portion 46 is formed at the distal end of the insertion cylinder portion 44 to enter the valve port 19 and abut against the rear end surface of the movable valve 30. The distal end of the operation cylinder 42 is provided outside the insertion cylinder portion. A communication port 48 for communication is provided.

Reference numeral 51 denotes a slide cylinder inserted through the outer periphery of the small-diameter portion 16, and a plurality of tapered ball holes 52 are provided in the radial direction on the front peripheral surface of the slide cylinder. Balls 53 are loosely fitted in the ball holes, and an outer step portion 55 is formed on an intermediate outer peripheral surface of the slide cylinder provided with a locking portion 54 at the rear.

Reference numeral 60 denotes an outer body slidably inserted into the outer periphery of the slide cylinder 51. A pressing surface 61 is formed inside the distal end of the outer body, and the ball 53 is engaged in front of the pressing surface. A concave groove 62 for stopping is provided in the circumferential direction, and is caulked and fixed integrally to the flange 43 of the working cylinder 42 located at the rear part of the outer body 60. The slide cylinder 51 and the outer body 60 are resilient to each other by a spring 66 interposed between the slide cylinder 51 and the outer body 60. A second spring 67 resiliently provided between the collar 43 of the operating cylinder and the locking piece 18.
When the outer body 60 slides rearward to release the pressing of the ball 53 by the pressing surface 61, the valve body 12 slides in the opposite direction to the outer body 60 and the ball 5
3 is pushed up in the radial direction.

Reference numeral 68 denotes a rubber hose having one end connected to the connecting cylinder 49 of the operating cylinder 42. The rubber hose 68 is used to prevent the rubber hose from being pulled off and falling off from the connecting cylinder 49.
9 is attached. The other end of the rubber hose 68 is connected to a connection receiving portion (not shown) for connecting a pipe.

The gas release preventing device 11 is usually provided with a ball 53 accommodated in a ball hole 52 provided in a slide cylinder 51.
Is provided with a locking groove 17 provided in the small diameter portion 16 of the valve body.
The upper portion of the ball is pressed by the pressing surface 61 of the outer body to prevent the ball from escaping (FIG. 4).
2 and the working cylinder 42 are fixed (FIGS. 2 and 4). In this case, the locking portion 54 of the slide cylinder 51 abuts the front surface of the flange 43 which is a part of the operation cylinder 42, and the projection 46 provided at the tip of the operation cylinder is located behind the movable valve 30 in the valve chamber. Abut on the edge and move forward,
Thereby, the valve port 19 is opened. Therefore, the fluid flows into the valve chamber 21 from the passage 36 of the distal end cylinder 35, and enters the second valve chamber 23 through the groove 32 (FIG. 5) of the movable valve 30 and the valve port 19 in the valve chamber. The fluid that has flowed into the second valve chamber 23 is supplied into the rubber hose 68 through a passage 47 from a flow port 48 provided at the tip of the working cylinder 42 (FIG. 2).

When the container tilts or falls due to an earthquake or an impact, the rubber hose 68 connecting the container and the pipe receiving portion is pulled in one direction, and the working cylinder 42 connected to the rubber hose is shown in FIG. 3 is pulled in the direction of the arrow. When the operation cylinder 42 moves, the outer body 60 fixed to the flange 43 of the operation cylinder also moves at the same time. When the pressing surface 61 of the outer body moves to the position of the outer step 55 of the slide cylinder 51, the pressing of the ball 53 located in the locking groove 17 is released. When a further rearward force is applied to the outer body 60 slid to the position of the outer step 55 of the slide cylinder 51, the outer step 55
The slide cylinder 51 is also moved, and the ball 53 is pushed up in the radial direction.

The working cylinder 4 is pulled by the pulling force of the rubber hose 68.
2 moves rearward, the movable valve 30 in the first valve chamber 21
Is pushed into the second valve chamber 23, and the movable valve 30 moves the valve port 19 by the elastic force of the valve spring 40.
Is closed (FIG. 3).

The slide cylinder 51 which moves together with the outer body 60
When the inner step 56 of the slide cylinder is hooked on the locking piece 18 (FIG. 3), the rearward movement is stopped, and the upper part of the ball 53 engages with the concave groove 62 of the outer body 60. The lower part of the ball is located on the outer peripheral surface of the small diameter portion 16 of the valve body. The operation cylinder 42, the outer body 60, and the slide cylinder 51 are prevented from moving toward the valve port 19 due to the resiliency of the second spring 67 and the spring 66, respectively. Therefore, even if the container is inadvertently returned to the original position without confirming the safety of the gas leak or the rubber hose 68 is loosened to cancel the tensile force of the rubber hose, the second spring 67 does not move. The operating cylinder 42 is opened by the resilient force
Because the structure is not moved in nine directions, the valve port 19 can be kept closed to prevent outgassing.

Whether or not the valve port 19 is closed by the movable valve 30 is checked when the outer body 60 moves and the surface of the slide cylinder 51 is partially exposed, and the valve port 19 is closed. Can be visually confirmed. In this case, by coloring the outer peripheral surface of the valve body 12 with a conspicuous color or fluorescent color, the visual confirmation can be made more reliably.

After confirming the presence or absence of gas leakage in the piping,
When gas is used again, the outer body 60 is moved in the direction of the arrow in FIG. 3 against the resilience of the spring 66 and the second spring 67, and the ball is moved to the position of the locking groove 17 of the valve body. Move 53. Then, the ball 53 is pressed against the pressing surface 6 of the outer body.
The movable cylinder 30 is moved forward to the substantially center of the first valve chamber 21 by pushing the movable cylinder 30 forward by the projecting portion 46 of the valve cylinder to open the valve port 19. Reset is completed.

FIGS. 6 and 7 show a second embodiment according to the present invention, in which a second gas emission preventing device 70 is moved forward through a step 72 provided in the center of the inside of a valve body 71. FIG. An internal connection portion 73 provided with a female screw is provided, and a valve chamber 74 is provided at the rear. A second valve chamber 76 having a slightly smaller diameter is provided at the rear via a taper portion 75 provided at the center of the valve chamber, and an external connection portion 77 provided with an external thread groove on the outer periphery of the second valve chamber is provided. .

Reference numeral 80 denotes an inner connecting portion 7 of the valve body 71.
3, a through hole 81 is provided at the center, a seal ring 83 is attached to the outer periphery of a flange 82 provided at the front end, and the inner connecting portion 73 is attached to the outer periphery of the rear end of the connection tube 80. A screw portion 84 to be screwed is provided. A projecting portion 85 having a rear end of the connecting cylinder 80 projecting into the second valve chamber 76 provides a communication passage 86 at a tip end of the through hole 81 in a direction perpendicular to the through hole.
The tip of the projection 85 projects into the valve chamber 74 of the valve body. Reference numeral 90 denotes a connection tube mounted on the outer peripheral surface of the connection tube 80. The connection tube 90 is provided with a male screw portion 91 for connecting a container valve and a tightening handle 92 at one end of the male screw portion.

Reference numeral 95 denotes a long operating body having a distal end housed in a valve chamber 74 of the valve body. A pair of flanges 97 are provided on the outer periphery of the distal end of a body 96 formed in a columnar shape. A small diameter connecting portion 98 is formed at the rear end. A seal ring 99 is mounted on the outer periphery of the body 96, and the ring spring 1
00 is provided in a ball hole 102 provided at an arbitrary position in the spring groove, and a ball 103 is housed in the ball hole 102, and a longitudinal guide groove 104 is provided on the opposite side of the ball hole. Is provided. Reference numeral 105 denotes a passage provided at the center of the operating body 95, one end of which is closed and the other end is opened to the connecting portion 98.
6 is provided.

Reference numeral 110 denotes a locking cylinder formed entirely in a cylindrical shape.
One of the steps 111 provided at the center of the locking cylinder has a large-diameter portion 11
2, the small diameter portion 113 is formed on the other, respectively,
The center portion of the valve body 71 has a shaft hole 114 through which the body portion 96 of the operating body 95 is inserted, and a screw hole 115 provided in front of the shaft hole. The part 77 is screwed.

At a substantially rear end of the small-diameter portion 113 provided in the locking cylinder 110, a shaft hole 1 provided in a direction perpendicular to the longitudinal direction of the locking cylinder is provided.
18, the locking portion 1 via a spring 122 and a locking piece 123.
19 are housed. A guide pin 125 is attached to the small-diameter portion 113 located on the opposite side to the locking portion in a direction perpendicular to the longitudinal direction of the locking cylinder 110, and the tip of the guide pin is engaged with the guide groove 104 of the operating shaft 95. The operation body is stopped to prevent the rotation of the operating body, and the ball 103 is securely fitted into the recess 120 of the locking portion 119. 126 is a spring,
The operating body 95 is mounted between the flange 97 of the operating body 95 and the bottom surface 129 provided at the inner end of the screw hole 115 of the locking cylinder 110 to urge the operating body 95 toward the connecting cylinder 80. 127
Is a seal ring attached to the flange 97.

The operation of the second gas emission preventing device 70 will be described. Normally, the tip of the operating body 95 in the valve body 71 is urged by a spring 126 from the rear and is provided at the rear end of the connecting cylinder 80. It is in contact with the part 85. Therefore, the fluid flows from the through hole 81 of the connecting cylinder 80 through the communication passage 86 to the valve chamber 7.
4 from the communication passage 106 of the operating body 95 to the passage 1
05, and flows to the rubber hose 68 side (FIG. 6).

When the container tilts or falls, the rubber hose 68 connecting the container and the pipe receiving portion is pulled, and the operating body 95 connected to the rubber hose 12 is also moved in the direction of the arrow shown in FIG. Slide to. At this time, the operating body 95
Is retracted by the guide pin 125 of the locking cylinder 110 without rotating in the circumferential direction, and the upper portion of the ball 103 loosely fitted in the ball hole 102 of the body portion 96 is located on the lower surface of the locking portion 119. The ball 103 is securely fitted into the recess 120 of the locking portion 119 by the elastic force of the ring spring 100 to fix the operating body 95. When the operating body 95 slides in the valve main body 71, the flange 97 at the tip of the body 96 moves into the second valve chamber 76, and the second valve chamber is closed by the seal ring 127 attached to the flange 97. The supply of gas in the direction of the communication passage 106 can be reliably prevented (FIG. 7).

Since the second valve chamber 76 is closed and the operating body 95 is fixed, even if the gas leaks carelessly without confirming the safety of the gas leak, the leak of the gas can be prevented. Also,
Confirmation of whether or not the second valve chamber 76 is closed by the operating shaft 95
The movement of the operating shaft 95 and the protrusion of the locking portion 119 in the centrifugal direction can be visually confirmed.

When the gas is allowed to flow out again, after confirming the presence or absence of gas leakage in the pipe portion and the safety, the locking portion 119 attached to the locking cylinder 110 is pushed down, so that the ball 103 is moved to the ball of the body portion 96. Return to hole 102. At the same time, the spring 12
The resilient force of 6 causes the operating body 95 to slide toward the connecting cylinder 80. The distal end of the operating shaft 95 abuts the projecting portion 85 of the connecting cylinder 80, and the flange 97 of the operating body and the seal ring 99 move from the second valve chamber 76 into the valve chamber 74, and the communication passage 106 and the valve The cylinder 76 is opened.

FIGS. 8 and 9 show a third embodiment according to the present invention. A third gas emission preventing device 131 comprises a wall portion 133 provided inside a cylindrical valve body 132.
A through hole 134 is provided at the center of one of the holes, a connection portion 135 provided with a female screw is provided at one of the through holes, and a large-diameter accommodation chamber 1 is provided at the other.
36 are provided. Reference numeral 139 denotes a connecting cylinder formed entirely in a tubular shape. A seal packing 141 is attached to a flange 140 provided at a front part of the connecting cylinder, and a screw part 142 for screwing with the connecting part 135 is provided at the rear. A valve chamber 144 is provided through a step 143 in a passage 145 provided at the center of the connecting cylinder. A connecting tube 14 for connecting the container is provided around the outer periphery of the connecting tube 139.
8 is loosely fitted into the connection cylinder, and the external thread portion 14 for connecting the container valve is connected to the connection cylinder.
9 and a tightening handle 150 are provided.

Reference numeral 152 denotes a valve chamber 144 of the connecting cylinder 139.
The valve body is inserted into the inside of the valve body.
An operating cylinder 167 housed in the housing chamber 136 of the valve body 132 is provided on the outer periphery of the other end.
And a screw portion 154 that is screwed with the inner surface of the tip of the head. The first and second passages 155a, 1 provided at the axis of the valve body 152
A seal ring 158 is mounted on the outer side between the first and second communication passages 55b.
7a and 157b are provided. One of the first communication paths 157
a and the first passage 155a, and the second communication passage 1
57a and the second passage 155b.
The two passages communicate with each other in the valve chamber 144.

Reference numeral 161 denotes a valve cylinder attached to the connecting portion 135 of the valve body 132 and the connecting cylinder 139.
1 is inserted into the connecting cylinder 139, a locking flange 163 is provided on the outer periphery of one end of the valve cylinder, and a taper section 1 is provided inside the distal end of the valve cylinder.
64 are formed on the inner and outer surfaces of the valve cylinder, respectively.
5 is attached. A locking flange 170 is provided at a distal end of a large-diameter portion 169 having a screw portion 168 provided on an inner surface of an operating cylinder 167 having a distal end housed therein in a housing chamber 136 of the valve main body 132, A small diameter connecting portion 171 is formed. The screw portion 154 of the valve body 152 is screwed to the screw portion 168 provided at one end of the communication passage 172 provided at the center of the operation cylinder 167.

Reference numeral 175 denotes a spring tube attached to the threaded portion 168 of the operation tube. A flexible and resilient tubular spring piece 177 is provided at the center of the spring tube. Has a plurality of slit grooves and is provided with a locking claw 178 on the outside of the tip. Housing chamber 136 of valve body 132
The outer peripheral surface of a support cylinder 180 attached to the opening end of the support cylinder is connected to the valve body 132 by a hook piece 181, and the inner edge of an engagement recess 183 provided on the inner peripheral surface of the support cylinder has a slightly smaller diameter. The outer edge is formed to have a slightly larger diameter and a different diameter. 185
Is a reset cylinder inserted through the inside of the support cylinder. The reset cylinder has a curved surface portion 186 formed by gently curving the entire inner surface of the reset cylinder, and a locking flange 187 provided at one end of the reset cylinder is connected to the support cylinder. 180 is slidably mounted in the engagement recess 183. A spring 188 is interposed between the locking flange 170 of the operation cylinder 167 inserted into the accommodation chamber 136 and the support cylinder 180 to urge the operation cylinder 167 forward, that is, in the direction of the valve body 152. .

The operation of the third gas emission preventing device 131 will be described. Normally, the rear end of the valve body 152 inserted into the connecting cylinder 139 and the accommodation chamber 136 of the valve body 132
The end of the working cylinder 167 housed in the inside is connected, and the resilient force of the spring 188 connects the flange 153 of the valve body to the connecting cylinder 1.
It is in contact with a step portion 143 in FIG. 39 (FIG. 8). Therefore, the fluid flows from the passage 145 of the connecting cylinder 139 to the valve body 152.
Through the first passage 155a and the first communication passage 157a, into the valve chamber 144, from the valve chamber into the second passage 155b through the second communication passage 157b, and into the communication passage 172 of the operating shaft 167.
And is supplied to the rubber hose side.

The container is tilted or overturned due to an earthquake or strong impact, and the rubber hose 68 connecting the container and the pipe holder is pulled, and at the same time, the operating cylinder 1 to which the hose is connected.
The pulley 67 and the valve body 152 are pulled in the direction of the arrow shown in FIG. 9, so that the second communication passage 157b of the valve body 152 slides into the valve cylinder 161 and the seal packing 15 of the wall 156.
8 easily fits into the valve cylinder 161 via the taper portion 164 to close the second passage 157b (FIG. 9).

The operating cylinder 167 slides in the direction of the arrow in FIG. 9 and at the same time, the spring cylinder 175 mounted on the outer periphery of the operating cylinder.
The locking claw 178 of the spring piece 177 is locked in the engaging concave portion 183 of the support cylinder 180, so that even if the tensile force of the rubber hose 68 is lost, it is locked in the locking concave portion. The locking claw 178 is locked in the engagement concave portion 183 of the support cylinder 180 by the elastic force of the spring piece 177. Therefore, the operation cylinder 167 does not return in the direction of the connection cylinder 139, and the seal ring 158 and the second connection path 157b of the valve body 152 located in the valve cylinder 161 are closed as they are, so that gas emission can be prevented.

The closing of the valve port in the third gas emission prevention device 131 is confirmed by the fact that the reset cylinder 185 and the operation cylinder 167 are clearly separated from the support cylinder 180 of the valve body 132 as shown in FIG. Can be confirmed visually.
When the gas is allowed to flow again, after confirming the presence / absence of gas leakage in the pipe portion and safety, when the reset cylinder 185 is pushed in the direction of the valve body 132, the spring piece 177 of the spring cylinder 175 has a curved surface of the reset cylinder. It is pushed down by the part 186. Then, the locking claw 178 is moved to the flange 18 of the engagement recess 183.
At the same time, the operating cylinder 167 and the valve body 152 slide in the direction of the connecting cylinder 139 by the elastic force of the spring 188, and the second communication passage 157b of the valve body and the seal packing 15 are moved.
8 moves into the valve chamber 144, and the communication passage 157 and the valve cylinder 16 move.
1 can be easily opened.

[0039]

According to the first aspect of the present invention, the valve body is made to slide by the operation cylinder and the outer body which are pulled by the rubber hose pulling the ball loosely fitted in the slide cylinder by the fall of the container or the like. The locking ball is moved to the recessed groove of the outer body to securely close the valve port of the valve body. Further, the operating cylinder and the outer body repel the spring and the second spring to prevent return to the original position, thereby maintaining the closed state of the valve port and preventing gas leakage. Even if the container is returned to its original state without confirming the safety and the tensile force of the rubber hose is loosened, the operation cylinder and the outer body are not returned to the original position because the spring and the second spring are resilient. The movable valve can prevent gas leakage by keeping the valve port closed. According to a second aspect of the present invention, the ball which is loosely fitted to the operating body is formed so as to be fitted to the locking portion of the locking cylinder by sliding the operating body, so that the rubber hose can be used when the container falls down. The second valve chamber is securely closed by the tensile force. Further, even if the tensile force of the rubber hose is loosened, the operating body is fixed by the ball, so that the valve port is not opened and gas leakage can be prevented. Further, since the second valve chamber is provided in the valve body to simplify the structure and reduce the number of parts, the cost is low and the cost is low. Further, when the second valve chamber is closed, a part of the locking portion projects from the small diameter portion of the locking cylinder, so that the presence or absence of the closing of the valve port can be visually confirmed. According to the third aspect of the present invention, the operation cylinder is fixed by the spring cylinder, the support cylinder, and the reset cylinder only by the operation of sliding the operation cylinder in the axial direction. And can prevent gas leakage. Further, since the structure of each component is simple, the cost is low and it is economical.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a conventional safety device for preventing gas leakage.

FIG. 2 is a cross-sectional view showing a valve open state of the gas release prevention device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the valve closed state of FIG.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a sectional view taken along line BB of FIG. 2;

FIG. 6 is a cross-sectional view showing a valve opening state of a gas emission prevention device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view showing the valve closed state of FIG.

FIG. 8 is a cross-sectional view showing a valve opening state of the gas release prevention device according to the third embodiment of the present invention.

FIG. 9 is a cross-sectional view showing the valve closed state of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 First gas emission prevention device 12 Valve body 17 Locking groove 18 Locking piece 19 Valve port 21 First valve chamber 23 Second valve chamber 25 Connecting cylinder 30 Movable valve 32 Groove section 33 Seal ring 35 Tip cylinder 36 Through hole 37 check valve port 38 seal ring 40 valve spring 42 operating cylinder 43 flange 44 insertion cylinder 46 projection 47 passage 48 communication port 51 slide cylinder 52 ball hole 53 ball 54 locking part 55 outer step 56 inner step portion 60 outer body 61 pressing surface 62 concave groove 66 spring 67 second spring 68 rubber hose 70 second gas emission prevention device 131 third gas emission prevention device

Claims (3)

[Claims] 1. A movable valve is urged by a valve spring toward a valve port in a first valve chamber of a valve body in which a first valve chamber is formed in one of a valve port provided therein and a second valve chamber is formed in the other. A first end chamber is provided with a check ring at the rear end of a through hole provided at the center with a seal ring mounted on the outside and attached to the end of the first valve chamber. Accommodates an insertion tube portion formed at the front of an operation tube having a passage therein and having a protruding portion at the tip, and a plurality of balls are loosely fitted to the outer peripheral surface of the tip outside the second valve chamber. A slide cylinder to be inserted, and an outer body having a concave groove and a pressing surface on a front inner surface and having a rear end fixed to a flange provided on the operation cylinder are inserted through the outside of the slide cylinder. The second spring is resilient between the flange portion of the valve body and the locking piece attached to the rear end of the valve body, and the spring is resilient between the outer body and the slide cylinder. When the ball engages with the locking groove of the valve body, the protruding portion of the operating cylinder comes into contact with the rear end of the movable valve and moves forward to open the valve port, and the rubber hose is pulled. When the operating cylinder is retracted, the ball moves and moves from the locking groove of the valve body to the recessed groove of the outer body, and the protrusion provided at the tip of the insertion cylinder portion is moved from the first valve chamber to the second valve chamber. A gas release prevention device, wherein the movable valve is retracted into a valve chamber, and the movable valve is retracted by an elastic force of a valve spring to close a valve port. 2. A connecting cylinder is attached to a connecting portion provided on one side via a step provided in a cylindrical valve body, and a taper portion is provided at a center in a valve chamber provided on the other side of the step. , A second valve chamber is formed, and a seal ring is mounted between flange portions provided at the tip of a body portion formed in a columnar shape as a whole, and a ball provided at an outer peripheral intermediate portion of the body portion. In the hole, a ball is spring-loaded with a spring to loosely fit, a guide groove is provided on the opposite side of the ball hole, and a connecting portion for connecting a rubber hose is provided at the other end of the body. A passage having a closed end at one end is formed inside the body, and an operating body having a communication passage connected to the passage at a right angle to the inner end of the passage is inserted into a valve chamber of the valve body, and one end is inserted into the valve body. The body of the operating body is inserted into the passage of the locking cylinder connected to the valve body and is resiliently spring-loaded, and the axial direction of the operating body is substantially at one side of the locking cylinder. A locking portion is attached via a spring at right angles to the locking portion, and a locking pin opposite to the locking portion is provided with a guide pin for locking in the guide groove of the operating body, and the operating body is pulled in the direction of the connecting portion. When the operating member is retracted, the seal ring of the operating member moves to the second valve chamber of the valve body to prevent the gas from flowing out excessively, and the ball of the operating member is locked by the locking portion so that the operating member is locked. A gas emission preventing device characterized by fixing a device. 3. A through-hole is provided at the center of a wall provided at one end of the inside of a cylindrical valve body, a connecting portion is provided at one of the through-holes, and a housing chamber is provided at the other of the through-holes. At one end
A cylindrical connecting cylinder having a ring is attached, and a valve chamber provided inside the connecting cylinder accommodates a valve body and a valve cylinder closed by a seal ring attached to a tip of the valve body. The rear end of the valve body projects from the through hole into the accommodation chamber, and is spring-resiliently inserted into the accommodation chamber to communicate and mount the operating cylinder housed therein, and the spring cylinder is mounted in the central longitudinal direction of the operating cylinder. A reset cylinder is inserted between the outer periphery of the spring cylinder and a concave portion of a support cylinder attached to the accommodation chamber side of the valve body, and the reset cylinder is formed so that the surface of the spring cylinder can be pressed by the reset cylinder. When the hose connected to the connecting portion is pulled, the operating cylinder retreats and at the same time the valve body slides backward, and the seal ring of the valve body closes inside the valve cylinder to close the passage. The spring portion of the spring tube attached to the working tube fits into the locking flange of the support tube and the working tube Gas emission preventing apparatus characterized by fixing.