JPH051785A - Cylinder main valve cutoff device - Google Patents

Abstract

PURPOSE:To provide a cylinder main valve cutoff device constituted in such a way that a cylinder main valve can be opened by manual operation and can be closed by means of an actuator. CONSTITUTION:A chuck 15 is installed in a handle 4a of a cylinder main valve 4, and the chuck 15 is connected to an output shaft 13 of an air cylinder 6 through a swivel joint 14. A one-way clutch 45 is interposed between the output shaft 13 and the swivel joint 14, and the main valve 4 is opened by means of a manual operation handle 50 connected to the chuck 15. Air from an air source is supplied to a large diameter cylinder 10, and at the same time is supplied to a small diameter cylinder 11. When the valve is driven so as to be closed, the air in the large diameter cylinder 10 is discharged outside. A piston 9 is displaced to the large diameter cylinder 10 side by means of air pressure of the small diameter cylinder 11, and its driving force is transmitted to the chuck 15 through the one-way clutch 45, so that the main valve 4 can be closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder main valve shutoff device, and more particularly to a cylinder main valve shutoff device configured to drive a main valve of a cylinder to be closed.

[0002]

2. Description of the Related Art For example, a semiconductor material gas used in a semiconductor manufacturing process is highly toxic depending on the type of gas, flammable, self-combustible, flammable, or a combination thereof. There are things of nature.

A cylinder for storing these harmful gases is housed in a cylinder storage box having an exhaust duct, and a main valve for opening and closing the cylinder is attached to the upper part of the cylinder to supply the gas in the cylinder to the outside. Has been. And
A cylinder valve opening / closing device for automatically opening and closing the cylinder valve as described above by remote control has been developed.

As a cylinder valve opening / closing device of this type, there is one previously proposed by the applicant of the present invention in Japanese Patent Laid-Open No. 62-41498.

In this proposed apparatus, an actuator is provided above the cylinder, and an operation signal from an operating device provided at a place distant from the installation site of the cylinder is supplied to the actuator. In addition, the actuator is connected to a valve opening pipe and a valve closing pipe for supplying compressed air to an air cylinder composed of a piston / cylinder, etc.The actuator is operated by a solenoid valve provided in the valve opening pipe and the valve closing pipe. The main valve of the cylinder is opened and closed by operating in accordance with.

[0006]

However, in the cylinder valve opening / closing device proposed above, the actuator can be driven in the valve opening or valve closing direction by remote control, and the valve mounted on the cylinder can be opened / closed. Was becoming.

However, when replacing the cylinder, after closing the original valve of the used cylinder and replacing it with a new cylinder, the chuck of the connecting member connected to the output shaft of the actuator is connected to the handle of the original valve. The actuator was operated again to drive the actuator in the valve opening direction.

Then, the operator has confirmed that the scale indicating the stroke of the actuator and the valve opening of the original valve are the same.

When the valve opening operation of the main valve is performed during such a cylinder replacement or inspection, when the conventional main valve is suddenly opened by the driving force of the actuator, an excessive pressure is applied to the pressure reducing valve on the downstream side. There was a risk that the pressure reducing valve would be damaged.

Therefore, it is an object of the present invention to provide a cylinder valve shutoff device which solves the above problems.

[0011]

SUMMARY OF THE INVENTION The present invention is directed to a cylinder filled with gas, a main valve attached to the cylinder to open or close the cylinder, and a manually operated handle connected to the handle of the main valve. A connecting member having one end connected to the manually operated handle, an actuator for driving the handle of the original valve in a valve opening or valve closing direction by an output shaft connected to the other end of the connecting member, and the output shaft. Includes a clutch that disconnects the connection between the output shaft and the handle of the original valve when driven in the valve opening direction.

[0012]

Since the original valve can be manually opened by turning the manual operation handle in the valve opening direction, it is possible to confirm the opening and valve opening of the original valve on the spot. Further, it becomes possible to slowly open the main valve by turning the manually operated handle.

[0013]

1 to 3 show an embodiment of a cylinder valve shutoff device according to the present invention.

In each of the drawings, a cylinder 1 is filled with a semiconductor material gas and is stored in a box-shaped cylinder storage box 2. Further, the cylinder 1 is held in the cylinder storage box 2 in a vertical state by a cylinder fixing fitting 3.

A main valve 4 is attached to the top of the cylinder 1. The main valve 4 is opened and closed by turning the handle 4a.

An actuator box 5 has an air cylinder 6 as shown in FIG. The air cylinder 6
The cylinder body 12 includes a piston 9 in which a large diameter piston 7 and a small diameter piston 8 are integrated, a large diameter cylinder 10 on which the large diameter piston 7 slides, and a small diameter cylinder 11 on which the small diameter piston 8 slides.

A rack 9a is mounted between the large-diameter piston 7 and the small-diameter piston 8 so as to extend in the axial direction, and a hollow output shaft 13 penetrating in the axial direction extends through the rack 9a. The pinion 13a provided on the outer periphery meshes.
The output shaft 13 is rotatably supported by a pair of bearings 12a and 12b embedded in the upper and lower portions of the cylinder body 12.

A one-way clutch 45 is press-fitted into the lower end of the hollow hole 13b of the output shaft 13, and a bush 46 having a female spline 46a is press-fitted into the inner periphery of the one-way clutch 45 as shown in FIG.

The one-way clutch 45 includes an inner ring 45a and an outer ring 4.
A steel ball 45c and a pressing spring 45d that presses the steel ball 45c counterclockwise are interposed between the steel ball 45c and 5b. The pressing spring 45
d is locked to the inner ring 45a, and the locking portion 45b ₁ is inclined so that the steel ball 45c is locked to the inner wall of the outer ring 45b.
And a curved portion 45b ₂ that escapes from the steel ball 45c in the outer peripheral direction.

Therefore, when the outer ring 45b is driven in the A direction, or when the inner ring 45a is rotated in the opposite B direction, the steel ball 45c abuts on the locking portion 45b ₁ of the outer ring 45b and the wedge action is performed. Thus, the steel ball 45c is locked so as to bite into the locking portion 45b ₁ . Therefore, the inner ring 45a and the outer ring 45b integrally rotate in the same direction (A or B direction).

However, as shown in FIG. 5, when the outer ring 45b is driven in the B direction or when the inner ring 45a is rotated in the opposite A direction, the steel ball 45c moves toward the curved portion 45b ₂ side of the outer ring 45b. Steel ball 45c and outer ring 45 to move to
It is relatively displaced in the opposite direction to b. Therefore, the inner ring 4
The connection between 5a and the outer ring 45b is cut off, and the inner ring 45a or the outer ring 45b runs idle, and the driving force cannot be transmitted.

The female spline 46a of the bush 46
A rod 47 having a male spline 47a is slidably fitted in the upward and downward directions on the output shaft 1
The rotation of No. 3 is transmitted through the one-way clutch 45, and the vertical position can be adjusted.

The lower end of the rod 47 is connected to the upper end 48a of the universal joint 14 via a pin 47a, and the lower end 14b of the universal joint 14 is fitted with a joint 49.

The upper end of the joint 49 is the lower end 14 of the universal joint 14.
It is fitted in b and is connected via a pin 49a.
Further, the lower portion of the joint 49 is the shaft hole 50 of the manual operation handle 50.
It is fitted in a and is connected via a pin 50b.

Further, the manually operated handle 50 is connected to the chuck 15 chucked on the outer periphery of the handle 4a of the main valve 4 via a pin 15a. Therefore, the driving force of the air cylinder 6 is composed of the transmission mechanism (consisting of the rack 9a, the pinion 13a, the one-way clutch 45, the bush 46, the lot 47, the universal joint 14, the joint 49, the manual operation handle 50, and the chuck 15) of the above configuration. Is transmitted to the handle 4a of the main valve 4 via the valve to close the main valve 4.

Therefore, the handle 4a of the main valve 4 is closed by driving the piston 9 in the valve closing direction (X ₂ direction in FIG. 2). Further, the actuator box 5 is supported by a bracket 16 in the cylinder storage box 2 and fixed above the main valve 4, and the front side of the main valve 4 is fixed on the front side thereof.
A valve opening indicator 17 for displaying the valve opening is provided.

Reference numeral 18 is a relay box, which is provided on the side surface of the cylinder storage box 2 and is an air pipe 1 for supplying compressed air.
It is connected to the actuator box 5 via 9, 20 and an air pipe 21. Therefore, the relay box 18 and the actuator box 5 are all transmitted and received by an air signal.

Reference numeral 22 denotes a control box, which is provided at a place distant from the cylinder storage box 2 and controls switching of each solenoid valve in a relay box 18 described later by an electric signal. Further, the control box 22 is connected to a remote switch 23 provided on the front surface of the cylinder storage box 2. The control box 22 and the remote switch 23 have valve opening switches 22a and 23a, valve closing switches 22b and 23b, and mounting switches 22c and 2 respectively.
3c is provided.

Therefore, the main valve 4 can be opened and closed by operating the control box 22 provided at a remote place of the cylinder 1 or the remote switch 23 provided at the installation place of the cylinder 1. In that case, the actuator box 5 provided in the cylinder storage box 2
Air signal is supplied to the cylinder storage box 2
Does not use electrical signals and has an explosion-proof structure.

6, in the middle of the air pipe 19 of the relay box 18, a pressure reducing valve 24 for reducing the air pressure from the air source to a predetermined pressure, a first valve opening solenoid valve 25, and a second valve
And a solenoid valve 26 for opening the valve. An electromagnetic valve 27 for mounting operation is arranged on the branch pipe 20a branched from the air pipe 20 and the exhaust pipe 44.

In addition, the relay box 18 is provided with a valve open display contact converter 28, a valve close display contact converter 29, and a mounting failure display contact converter 30. The valve opening solenoid valves 25 and 26, the mounting operation solenoid valve 27, the valve opening display contact converter 28, the valve closing display contact converter 29, and the mounting failure display contact converter 30 are connected to the control box 22. It is connected.

The valve opening solenoid valves 25 and 26 and the mounting operation solenoid valve 27 are 3-port 2-position spring-offset solenoid valves, respectively, which resist the spring force when the solenoid is energized. The solenoid is demagnetized and the spring force returns to the state before the operation.

That is, when the solenoid is demagnetized, the valve-opening solenoid valves 25 and 26 are switched so that the exhaust pipe 44 and the large-diameter cylinder 10 are communicated with each other, and when the solenoid is excited, they are connected to the air source. It communicates with the diameter cylinder 10.

In addition to the air cylinder 6, the actuator box 5 has a variable throttle 31 arranged in the air pipe 19 and a check valve 33 provided in a bypass pipe 32 for bypassing the upstream and downstream sides of the variable throttle 31. Have. Further, the actuator box 5 includes a branch pipe 34 branched from the air pipe 19, an air actuating valve 35 disposed in the branch pipe 34, a bypass pipe 36 for bypassing the upstream and downstream sides of the air actuating valve 35, and a bypass pipe. It has a check valve 37 arranged in the pipe 36.

The air pipe 19 is connected to the large diameter cylinder 10 of the air cylinder 6, and the branch pipe 34 is connected to the air chamber 11a communicating with the small diameter cylinder 11.

Further, the actuator box 5 is internally provided with the valve open display limit valve 3 connected to the air pipe 20.
8, a valve closed display limit valve 39, and a mounting failure display limit valve 40. Further, the valve open display limit valve 38, the valve close display limit valve 39, and the improper installation display limit valve 40 are connected to the valve open display contact converter 28 and the valve close display of the interruption box 18 via the air signal pipes 41, 42 and 43. Contact converter 29, contact converter 3 for mounting failure display
It is connected to 0.

The operation of the cylinder valve shutoff device having the above construction will now be described.

After the chuck 15 is attached to the handle 4a of the main valve 4 of the cylinder 1, the manual operation handle 50 is rotated counterclockwise when the main valve 4 is opened. As a result, the handle 4a of the main valve 4 is rotated in the same direction via the chuck 15, and the main valve 4 opens. Therefore, the operator can confirm that the main valve 4 has opened on the spot, and
The valve opening of can be adjusted to a desired position.

Since the operator can turn the manual operation handle 50 relatively slowly, the gas in the cylinder 1 can be prevented from being rapidly supplied to the downstream side, and the pressure supplied to the pressure reducing valve on the downstream side can be prevented. Is gradually increased, which prevents the pressure reducing valve from being damaged. Incidentally, when the manual operation handle 50 is turned counterclockwise, the piston 9 is displaced toward the small diameter cylinder 11 side, but since the air in the air chamber 11a of the small diameter cylinder 11 is exhausted by the valve closing operation as described later,
There is no risk that the load on the handle 50 will increase.

Next, the valve opening switch 22a of the controller box 22 or the valve opening switch 2 of the remote switch 23.
Press 3a.

As a result, the signal from the control box 22 causes the solenoid valves 25, 26 for opening the relay box 18 to open.
And the solenoid valves 25 and 26 for opening the valve are excited. Therefore, as shown in FIG. 6, the valve opening solenoid valves 25 and 26 connect the air source and the large diameter cylinder 10 of the air cylinder 6.

Therefore, the compressed air from the air source is reduced by the pressure reducing valve 2.
After being depressurized to a predetermined pressure by 4, it is supplied to the large-diameter cylinder 10 via the air pipe 19. Large diameter cylinder 1
Since the variable throttle 31 is provided on the upstream side of 0, the pressure of the large diameter cylinder 10 is gradually increased.

As described above, the compressed air from the air source is supplied to the large diameter cylinder 10 and also flows to the branch pipe 34 branched from the air pipe 19 on the downstream side of the valve opening electromagnetic valve 26. At this time, the air operated valve 35 is in the closed state, and the air flowing into the branch pipe 34 is bypass pipe 36, the check valve 3
It flows into the air chamber 11a of the small diameter cylinder 11 via 7.

Accordingly, when the solenoid valves 25 and 26 for opening the valve are excited, the air from the air source passes through the air pipe 19, the branch pipe 34, and the bypass pipe 36 to the air in the large diameter cylinder 7 and the small diameter cylinder 11. It is simultaneously supplied to the chamber 11a. Since the variable throttle 31 is provided on the upstream side of the large-diameter cylinder 7, a large amount of air initially flows into the air chamber 11a, so that the air chamber 1 is larger than the large-diameter cylinder 7.
1a boosts pressure first.

Further, before operating the manual operation handle 50 by mistake, the valve opening switch 22a of the control unit 22 is operated.
Alternatively, when the valve opening switch 23a of the remote switch 23 is pressed, the compressed air from the air source is supplied to the air chambers 11a of the large diameter cylinder 10 and the small diameter cylinder 11 as described above.

The air chamber 11a of the small diameter cylinder 11
Then, when the large-diameter cylinder 7 is also pressurized, the piston 9 of the air cylinder 6 is driven toward the small-diameter cylinder 11 side due to the difference in pressure receiving area between the large-diameter piston 7 and the small-diameter piston 8. The driving force of the piston 9 is transmitted to the output shaft 13, but the outer ring 45b of the one-way clutch 45 only idles in the B direction as shown in FIG. 5, and the handle 4a of the main valve 4 does not rotate.

When the piston 9 is displaced to the small diameter cylinder 11 side, that is, to the valve open position, the pressure reducing valve 24 is provided inside the small diameter cylinder 11.
It is compressed above the pressure set by. Then, the valve open display limit valve 38 is switched, “Valve open” is displayed on the indicator 17 of the actuator box 5, and the air from the air pipe 20 opens the valve of the relay box 18 via the air signal pipe 41. It is supplied to the display contact converter 28. Then, the converter 28 converts the air signal into an electric signal and outputs the electric signal to the control box 22.

When the signal from the converter 28 is input, the control box 22 displays on the display unit (not shown) that the main valve 4 has opened.

As described above, when the solenoid valves 25 and 26 are excited, the air pipe 19, the branch pipe 34, and the bypass pipe 3
Since compressed air can be supplied to the air chambers 11a of the large-diameter cylinder 10 and the small-diameter cylinder 11 via 6, the air supply to the air chambers 11a is not forgotten, and when the valves are closed, the air chambers 11a Reliable piston 9 by air pressure
Can be driven in the valve closing direction.

Further, when the main valve 4 is opened, compressed air is also introduced into the branch pipe 34 and the bypass pipe 36 through the air pipe 19, so that the check valve 37 or the air actuated valve is used. Even if there is an air leak at 35, the air pressure in the air chamber 11a in the small diameter cylinder 11 is prevented from falling below the pressure set by the pressure reducing valve 24 (in other words, below the valve closing drive torque of the original valve 4). ing.

Therefore, it is possible to prevent an accident in which the small diameter cylinder 11 cannot be closed and driven due to insufficient pressure due to air leakage.

Next, the valve closing operation of the main valve 4 will be described. When closing the main valve 4, the control box 2
The second valve closing switch 22b or the remote switch 23 valve closing switch 23b is pressed.

As a result, the power supply from the control box 22 is cut off, and as shown in FIG. 7, the solenoid valve 2 for opening the valve is opened.
5, 26 are switched to the state before the operation by the spring force.

That is, the valve opening solenoid valves 25 and 26 are switched so that the exhaust pipe 44 and the air pipe 19 on the downstream side are communicated with each other, and the air pipe 19 on the upstream side is shut off. Therefore, the air in the large-diameter cylinder 10 flows through the variable throttle 31 and the check valve 33 of the bypass pipe 32 into the exhaust pipe 44 and is discharged to the outside.

Since the air pipe 19 is provided with the variable throttle 31, most of the air in the large diameter cylinder 10 is exhausted through the check valve 33.

On the other hand, since the compressed air from the air source is accumulated in the air chamber 11a of the small diameter cylinder 11 as described above, the pressure acting on the large diameter piston 7 along with the exhaust of the large diameter cylinder 10 is reduced, The difference between the pressure acting on the large diameter piston 7 and the pressure acting on the small diameter piston 8 is reversed.

As a result, the piston 9 is the large diameter cylinder 10
And the output shaft 13 is driven in the valve closing direction (direction A). When the output shaft 13 is driven in the A direction, the outer ring 45b rotates in the A direction and the inner ring 45a rotates as shown in FIG.
Are also driven in the same direction. Therefore, the driving force of the piston 9 is transmitted to the handle 4a of the original valve 4 via the output shaft 13, the one-way clutch 45, the universal joint 14, the manual operation handle 50, and the chuck 15, and the original valve 4 is closed.

When the piston 9 is displaced to the valve closing position, the valve closing indication limit valve 39 is switched, and an air signal is supplied to the valve closing indication contact converter 29 through the air signal pipe 42. Then, the converter 29 converts the air signal into an electric signal and outputs the electric signal to the control box 22. In the control box 22, when the signal from the converter 29 is input, the fact that the main valve 4 is closed is displayed on the display unit.

Further, after the valve closing position is detected, the main valve 4
After driving the handle 4a in the tightening direction for several seconds (for example, about 5 seconds) until the valve is completely closed, the control box 22 causes the solenoid valve 27 for mounting the relay box 18 to operate for several seconds (3 seconds in this embodiment). Energize by energizing.

Therefore, the solenoid valve 27 is connected to the air pipes 20 and 2
1 is switched to communicate with 1 to supply an air signal to the air actuated valve 35 of the actuator box 5. As a result, the air operated valve 35 is switched as shown in FIG. 4, and the branch pipe 34 and the small diameter cylinder 11 are communicated with each other. At this time,
Since the valve opening solenoid valve 26 connects the exhaust pipe 44 and the air pipe 19, the air in the small diameter cylinder 11 is exhausted to the outside through the branch pipe 34, the air pipe 19, and the exhaust pipe 44.

Therefore, after the main valve 4 is completely closed, the air of the residual drive pressure in the small diameter cylinder 11 is exhausted and the valve tightening torque can be released. As a result, the original valve 4
It is possible to prevent the damage of the valve seat and the packing of the above.

As described above, the air pipe 19 and the branch pipe 34
Serves as both air supply and air discharge to the cylinders 7 and 11, and the piping configuration is simplified.

Since the air pipe 19 is provided with a pair of valve-opening solenoid valves 25 and 26 which are in communication with the exhaust pipe 44 in series, even if one solenoid valve does not return due to the spring force, the other solenoid valve opens. If the solenoid valve is restored, the air pipe 19 on the downstream side is inevitably connected to the exhaust pipe 44, and the air cylinder 6 has a safety structure so that the air cylinder 6 is surely driven to be closed.

Since the large diameter cylinder 10 and the small diameter cylinder 11 are both open to the atmosphere as described above after the main valve 4 is closed, the piston 9 can be manually moved, and the cylinder 1 The chuck 15
The handle 4a and the connecting position can be easily adjusted.

Here, a case where a disaster such as an earthquake occurs will be described.

In FIG. 6, when the power supply is stopped due to an earthquake, for example, the solenoid valves 25 and 26 for opening the valve that have been excited up to that time are restored by the spring force as shown in FIG. And the air pipe 19 on the downstream side communicate with each other.

Therefore, the air in the large diameter cylinder 10 is
It is exhausted to the outside through the exhaust pipe 44 through the check valve 33 and the variable throttle 31. As the inside of the large-diameter cylinder 10 is depressurized, the piston 9 of the air cylinder 6 moves to the small-diameter cylinder 11
The air pressure in the air chamber 11a causes the handle 4a of the main valve 4 to be driven in the valve closing direction by being displaced toward the large-diameter cylinder 10 side.

In this way, even if a power failure occurs due to an earthquake, the air cylinder 6 drives the main valve 4 to close and prevent the gas from flowing from the cylinder 1.

A case where the air source or the piping connecting the air source and the actuator box 5 is damaged due to the occurrence of an earthquake and the air supply is stopped will be described.

For example, when the air pipe 19 is cut off on the upstream side of the relay box 18 due to the occurrence of an earthquake, the air pipe 19 is opened to the atmosphere, so that the air in the large-diameter cylinder 10 passes through the air pipe 19 to the outside. Exhausted to. Therefore, the piston 9 of the air cylinder 6 is displaced toward the large diameter cylinder 10 side by the air pressure of the small diameter cylinder 11, and drives the handle 4a of the original valve 4 in the valve closing direction.

As described above, since the air cylinder 6 has the normally closed structure, the main valve 4 is operated as described above even if the power supply is cut off or the air supply is cut off.
Since it can be driven to close the valve, safety in an emergency such as an earthquake is further enhanced. Moreover, the air cylinder 6 itself that drives the opening and closing of the main valve 4 is configured to be closed and driven by the air pressure of the small diameter cylinder 11, which is a simpler configuration than providing a liquefied gas cylinder and a cylinder opening mechanism, and maintenance can be performed easily. ..

In the above embodiment, the one-way clutch 45 is provided on the output shaft 13 of the air cylinder 6, but the invention is not limited to this. For example, it may be provided between the universal joint 14 and the manual operation handle 50. good.

In addition to the one-way clutch 45, the point is that even if the air cylinder 6 is driven in the valve opening direction, its driving force is not transmitted to the chuck 15, and the driving force in the valve closing direction can be transmitted to the chuck 15. It suffices if a clutch mechanism is provided.

[0074]

As described above, in the cylinder main valve shutoff device according to the present invention, the main valve can be manually opened by turning the manually operated handle in the valve opening direction. The valve opening and valve opening can be confirmed. Further, since the main valve can be slowly opened by manually turning the handle for manual operation, the supply pressure to the downstream side can be gradually increased as compared with the case where the valve is opened by the actuator. It has features such as being able to prevent damage to the pressure reducing valve on the downstream side due to pressure increase during valve operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of a cylinder valve closing device according to the present invention.

FIG. 2 is an enlarged view showing a main part of the present invention.

FIG. 3 is a cross-sectional view showing the internal structure of an air cylinder.

FIG. 4 is an enlarged plan view showing the structure of a one-way clutch.

FIG. 5 is an enlarged plan view for explaining the idling operation of the one-way clutch.

FIG. 6 is a system diagram of an air pipe of the present invention.

FIG. 7 is a system diagram for explaining an operation during valve closing drive.

FIG. 8 is a system diagram for explaining the operation when releasing the valve closing drive pressure by opening the small diameter cylinder to the atmosphere after the valve closing drive.

[Explanation of symbols]

 1 Cylinder 2 Cylinder Storage Box 4 Main Valve 5 Actuator Box 6 Air Cylinder 7 Large Diameter Piston 8 Small Diameter Piston 9 Piston 10 Large Diameter Cylinder 11 Small Diameter Cylinder 13 Output Shaft 15 Chuck 18 Relay Box 19, 20, 21 Air Piping 22 Control Box 23 Remote switch 25,26 Solenoid valve for valve opening 27 Solenoid valve for mounting operation 32,36 Bypass piping 33,37 Check valve 34 Branch piping 35 Air operated valve 44 Exhaust piping 45 One-way clutch 50 Manual operation handle

Claims (1)

Claim: What is claimed is: 1. A gas-filled cylinder, a main valve attached to the cylinder to open or close the cylinder, and a manually operated handle connected to a handle of the main valve. A connecting member having one end connected to the manually operated handle, an actuator for driving the handle of the original valve in a valve opening or valve closing direction by an output shaft connected to the other end of the connecting member, and the output shaft being a valve. A cylinder main valve shutoff device, comprising: a clutch that shuts off the connection between the output shaft and the handle of the main valve when driven in the opening direction.