JPH01303384A - Emergency cutoff valve - Google Patents

Abstract

PURPOSE:To simplify the structure and make the size of the device smaller in the title valve by providing a pressure detecting part and a plunger solenoid part, coaxially and moving either of both parts so as to operate the valve. CONSTITUTION:The valve part 20 of the title emergency cutoff valve is opened/ closed by an actuator 19, which is driven under a high pressure gas sealed in a vessel 30. There are provided a pressure detecting part 15 and a plunger solenoid mechanism 18, axially to the vessel 30. The pressure detecting part 15 has a pressure receiving body 32 which receives a pressure on the secondary side of a fluid passage and displaces according to variation in the pressure. The plunger solenoid mechanism 18 can receives a signal from respective sensors.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an emergency shut-off valve, and more particularly to an emergency shut-off valve configured to further simplify an emergency shut-off system used as a safety device for supply lines such as city gas.

Conventional technology For example, a control valve is installed in the middle of a supply line that supplies city gas, etc. to control the pressure according to the amount of gas consumed on the downstream side, and in an emergency, the supply line is shut off to stop the gas supply. A shutoff system is provided.

A conventional shutoff system is shown in FIG. In FIG. 6, a shutoff system 1 includes an emergency pressure detection shutoff valve (hereinafter simply referred to as a shutoff valve) 3 provided upstream of a control valve 2, a manual open/close ball valve 4, and a supply line 5 branched from the upstream side. Posted @
A device consisting of a pressure reducing valve 6 provided in the middle of the supply line 5a, and a three-way solenoid valve 7 provided between the pipe 5a and a pipe 5b branched from the upstream side of the supply line 5. Since both the shutoff valve 3 and the ball valve 4 are open, gas flows as shown by the arrow in FIG. 6 and is supplied to the downstream side of the control 2II valve 2 via the supply line 5. Further, the control valve 2 is a valve that controls the secondary pressure by changing the valve opening according to the amount of gas consumed on the downstream side of the supply line 5, and the cutoff valve 3 is a valve that closes in case of an emergency. .

This emergency situation mainly occurs due to a failure of the control valve 2, but if the secondary pressure is not controlled and increases abnormally,
Earthquakes, gas leaks, etc. may occur and the gas supply may be dangerous.

The shutoff valve 3 is provided with a pressure detection section 3a to detect an abnormal increase in the secondary pressure as described in (1) above.
In the pressure detection unit 3a, when the secondary pressure reaches a pressure that is dangerous for gas appliances installed downstream of the control valve 2,
The operating pressure is set in advance for activation.

Therefore, in the shutoff system 1, the secondary pressure of the control valve 2 is transmitted to the shutoff valve 3 via a pipe 5b branched from the supply line 5 on the downstream side, a three-way solenoid valve 7, and a pipe 5C connected to the three-way solenoid valve 7. It is designed to be supplied to the pressure detection section 3a. Although the three-way solenoid valve 7 is connected to a pipe 5a branched from the upstream side of the supply line 5, the three-way solenoid valve 7 normally communicates with the pipes 5b and 50 and closes the pipe 5a. Therefore, when the secondary pressure rises due to a failure of the control valve 2 or the like and reaches the pressure set by the pressure detection section 3a, the cutoff valve 3 performs an emergency valve closing operation to cut off the supply line 5.

In addition, a seismic sensor or gas leak sensor (
Various sensors 8 such as (both not shown) are provided. Therefore, for example, when the occurrence of an earthquake with a seismic intensity higher than a predetermined intensity is detected by various sensors 8, the control circuit 9
The a'#fI signal is output to the three-way solenoid valve 7, and the piping 5 is normally
The three-way electromagnetic valve 7 that communicates the pressure detection section 3a of the cutoff valve 3 with the pressure detection section 3a of the cutoff valve 3 is switched so that the upstream piping 5a communicates with the pressure detection section 3a.

As a result, the next pressure is reduced to a predetermined pressure by the pressure reducing valve 6 provided in the pipe 5a, and then the three-way solenoid valve 7 and the pipe 5C
The pressure is supplied to the pressure detection section 3a of the cutoff valve 3 via the pressure detection section 3a of the cutoff valve 3. Since the cutoff valve 3 is supplied with a pressure exceeding a predetermined set pressure, the valve closes and the supply line 5 is cut off. Further, since the conventional shutoff system 1 is provided with a hand-opened ball valve 4, the gas supply can be stopped by manually closing the ball valve 4.

Problems to be Solved by the Invention However, in the above-mentioned conventional shutoff system, each of the four
Of the valve devices, the cutoff valve 3 and ball valve 4 are installed in the supply line 5, and the other pressure reducing valves 6 and solenoid valves 7 are installed in the piping 5a, 5.
There are problems in that it is difficult to miniaturize the system because the number of parts is large, and it takes a lot of effort to install the above-mentioned shutoff system 1, making the installation work troublesome. .

Further, since the conventional shutoff system 1 has a large number of parts, there is a problem in that malfunctions due to breakdowns are more likely to occur.

Therefore, an object of the present invention is to provide an emergency shutoff valve that solves the above problems.

Means and operation for solving the problems The present invention provides a valve section disposed in a flow path for feeding fluid;
A manual opening/closing operation part that is manually operated to open and close the valve part, an actuator that closes or opens the valve part, a container containing a high-pressure gas generator that serves as a driving source for the actuator, and a secondary part of the flow path. A pressure sensing part that receives pressure from the side and stores a pressure receiving body inside that displaces according to changes in pressure, a hollow solenoid that is installed coaxially with the pressure sensing part, and a hollow solenoid that penetrates the solenoid and has one end. a plunger/solenoid structure having a plunger connected to a pressure receiving body; and the displacement of the pressure receiving body is transmitted via the plunger, or the displacement of the plunger due to excitation of the solenoid is transmitted, and the container is opened and the container is opened. and an unsealing mechanism that supplies high-pressure gas inside to the actuator, which reduces the number of parts and simplifies the configuration, as well as downsizing the device.

Embodiment FIGS. 1 to 3 show an embodiment of the emergency shutoff valve according to the present invention.

In each figure, an emergency shutoff valve 12 and a control valve 13 are installed in a supply line 11 that supplies city gas. The emergency shutoff valve 12 includes a pressure detection unit 15 that is supplied with the secondary pressure of the control valve 13 via a pipe 14, and various sensors (for example, a seismic sensor,
a control circuit 17 that is supplied with a signal from a gas leak sensor (such as a gas leak sensor) 16 and outputs a valve closing signal; and a plunger solenoid mechanism 1 that is operated by the signal from the control circuit 17.
8. Therefore, as will be described later, the emergency shutoff valve 12 may cause an abnormal pressure rise on the downstream side of the control valve 13.
Alternatively, when an emergency situation such as an earthquake occurs, the actuator 19 is operated to close the valve section 20 provided on the upstream side of the supply line 11, thereby cutting off the supply line 11. Further, the valve portion 20 is provided with a manual opening/closing lever 21, and the emergency shutoff valve 12 can also be operated manually to close the supply line 11.
The structure is such that it can block the

In addition, FIG. 1 shows a schematic structure of the emergency cutoff valve according to the present invention, and FIGS. 2(A) to (D) show the specific structure of the emergency cutoff valve. Therefore, each component in FIGS. 2(A) to 2(E) does not necessarily correspond to that in FIG. 1.

Specifically, as shown in FIG. 2 (△), the supply line 11
The upstream pipe 22 and the downstream pipe 2 are provided in an upright state.
3 so that both sides of the control valve 13 are supported by the "mouth"
It is formed in a shape (approximately an inverted U-shape).

In FIGS. 2(A) and 2(B), the valve part 20 is connected and fixed to the upper end of the upstream piping 22, and between the valve part 20 and the control valve 13, foreign matter in the flow path flows into the control valve 13. A strainer 24 is provided to prevent this from happening. 25 is the supply line 11
This is a recorder that records the pressure of gas passing through the strainer 24, and is provided on the side of the strainer 24. Moreover, the pressure detection section 15,
The plunger/solenoid mechanism 18 is connected to the upstream piping 22 respectively.
It is supported by brackets 22a and 22b fixed to , and is disposed between the upstream pipe 22 and the downstream pipe 23.

In FIGS. 2A to 2E, the emergency shutoff valve 12 includes the inlet valve section 20, the actuator 19, the pressure detection section 15,
It consists of a plunger solenoid mechanism 18 and is provided within the supply line 11 which is shaped like a "mouth".

Further, a bypass passage 11' is formed at a low position between the upstream pipe 22 and the downstream pipe 23. This bypass flow path 11' branches into a branch pipe 22c branched from the upstream pipe 22, a normally closed ball valve 28, and a throttle valve 29.1 that throttles the flow ω passing through the bypass flow path 11'. A connecting member 27 is connected to the connecting member 27, and a branch pipe 23a branches off from the downstream pipe 23 and is connected to the connecting member 27. still,
As shown in FIGS. 2(D) and 2(E), the bypass flow path 11' is provided so as to protrude forward from the upper and downstream pipes 22, 23 and extend horizontally between them.

Further, a flow path 2 extending vertically is provided at the upper part of the connecting member 27.
6 is connected. This flow path 26 is a flow path for releasing downstream gas into the atmosphere when the secondary pressure increases abnormally, and is normally closed. The flow path 26 includes a stop valve 26a, a connecting member 26b, a relief valve main body 26C1 connecting member 26d, and a stop valve 26e. Each stop valve 26a
, 26e are normally open. Also, the relief valve body 26
C is normally closed, and a pressure sensing portion 26C1 is provided on the side of the relief valve body 26G. This pressure detection part 26C1 is an outlet 23b provided in the downstream piping 23.
(In addition, in Fig. 2, the pressure detection part 26G+ and the outlet 23b
The piping connecting these is omitted. ) etc., and when the secondary pressure increases abnormally and exceeds a predetermined pressure, this is detected and the relief valve body 26c
Open the valve inside. As a result, the gas on the downstream side flows into the flow path 2.
6, and the secondary pressure is lowered.

The pressure detection unit 26C1 includes a diaphragm that receives secondary pressure and a spring that presses the diaphragm (both not shown).
By adjusting the spring force, the operating pressure at which the valve is opened (however, it is set higher than the operating pressure of the emergency shutoff well 12) is set. Further, when setting the valve opening operating pressure, the stop valves 26a and 26e are closed. A single-shaped flow path is formed inside each of the connecting members 26b and 26d, and an opening (not shown) that normally opens to the outside is closed. However, when setting the valve opening operating pressure, the connecting member 26b.

The plug (not shown) blocking the opening of 26d is removed and instead supplies pressure to the opening of the upstream connecting member 26b,
While changing the pressure, the gas flowing out from the opening of the downstream connecting member 26d is detected. Then, the spring force of the pressure sensing portion 26C1 is adjusted to set the pressure at the time of the valve opening operation.

Here, with reference to FIGS. 3 to 5, the emergency shutoff valve 12
The configuration will be explained in more detail.

As shown in FIG. 3, the emergency i-Arai 12 is filled with a pressure detection section 15, a plunger/solenoid mechanism 18, an actuator 19, a valve section 20, and a high-pressure gas generator that serves as a driving source for the actuator 19. Container 30 and Container 3
It has an opening mechanism 31 for opening 0.

As shown in FIG. 4, the inside of the pressure sensing section 15 is divided into a lower chamber 33a and an upper chamber by a bellow frame 32 whose peripheral portion is held between the main body 15a of the pressure sensing section 15 and a lid 15b that closes the main body 15a. 33b. Further, the flat portion 32a of the bellow frame 32 is connected to a nut 34a that is screwed onto the shaft 34.
By tightening the disc-shaped lower plate 35. It is held between the upper plate 36 and the upper plate 36.

The upper plate 36 is pressed downward by the spring force of a coil spring 37, and the spring force of the spring 37 is adjusted by turning a spring retainer 38 screwed into the female threaded portion 15c of the lid 15b.

The shaft 34 is slidably supported by a hollow bearing 39 that fits into the center hole 15d of the main body 15a, and
It moves up and down as well. The aforementioned piping 14 (indicated by a dashed line in FIG. 4) is connected to a pressure introduction hole 15e formed at the bottom of the main body 15a. Although the piping 14 is omitted in FIG. 2, the other end of the piping 14 is connected to the outlet of the upstream piping 22. Secondary pressure on the downstream side of the control valve 13 is introduced into the lower chamber 33a. Therefore, when the secondary pressure increases and a pressing force greater than the pressing force of the spring 37 acts on the bellofram 32 and the lower plate 35, the bellofram 32. Lower plate 35. The upper plate 36 will move upward.

A pair of spring receivers 40a are provided at the lower end small diameter portion 34b of the shaft 34,
40b are slidably provided facing each other, and the lower spring receiver 40a is prevented from falling off by a retaining ring 34c. A first spring 41 with a larger coil diameter and a second spring 42 with a smaller coil diameter are interposed between the spring receivers 40a and 40b.

The second spring 42 has a shorter overall length than the first spring 41, and when the shaft 34 is at the lower limit position as shown in FIG. 4, only the first spring 41 is compressed and the second spring 42
is in an uncompressed state.

Reference numeral 43 denotes a hook, which is attached to the spring receiver 40b in a non-removable state by a retaining ring 44 that engages with the inner peripheral surface. or,
The hook 43 has an engaging portion 43a extending downward, and the plunger solenoid mechanism 18 is disposed within the engaging portion 43a.
The upper end of the plunger 18a protrudes. Plunger 1
The upper end of 8a connects to the center hole 15f of the main body 15a and the hook 43.
It passes through the engagement hole 43b, and has a flange portion 18a1 at its end that has a larger diameter than the engagement hole 43b. Note that the flange portion 18a1 of the plunger 18 is normally spaced apart from the bottom portion of the hook 43 via a predetermined gap.

As shown in FIG. 3, the plunger/solenoid structure 18 includes a hollow solenoid 18b and a solenoid 1.
The plunger 18a penetrates through the pressure sensing portion 8b, and is coaxially provided below the pressure sensing portion 15.

Therefore, the plunger 18a is activated by the electromagnetic force generated when the solenoid 18b is excited, and when the displacement of the bellofram 32 is transmitted to the plunger 18a via the hook 43 and moves upward, as will be described later. It may be sucked upwards.

Further, the plunger 18a has an upper small diameter portion 18a2 and a lower large diameter portion 18a3, and a hook portion 18a4 is provided below the large diameter portion 18a3. Note that the hook portion 18a4 is engaged with the head of the needle 45 of the opening mechanism 31.

As shown in FIG. 5, opening 1 [31 is the plunger 18a
A cutter 46 that breaks through the sealing plate 30a of the container 30, a rod 47 having the cutter 46 at its lower end, a spring receiver 48 that engages with the rod 47, and a spring receiver 48 that presses the spring receiver 48 downward. Coil spring 49 and rod 4
This consists of a locking method 50 for locking 7. Usually, opening mechanism 3
1, the cutter 46 is in the upward movement position as shown in FIG. 5, and the rod 47 is locked by the locking method 50.

That is, when the needle 45 is in the lowered position, the locking method 50
contacts the large diameter portion 45a of the needle 45 and protrudes from the outer periphery of the rod 47. Therefore, the locking method 50 is
It comes into contact with the stepped portion 51a of the holding member 51 that slidably holds the. As a result, the rod 47, which has been pressed downward by the spring force of the coil spring 49, is locked at the downward movement position.

Reference numeral 52 denotes a return rotating arm, which has a bifurcated engaging portion 52a (partially cut away in FIG. 5) that engages with the pin 47a of the rod 47. Therefore, after the rod 47 is operated together with the cutter 46 to the container opening position, the arm 52
It returns to the upper position before activation by being rotated counterclockwise.

As shown in FIGS. 3 and 5, the container 30 is filled with a high B gas generator and sealed, and is attached to the attachment hole 31b of the main body 31a so that the sealing plate 30a faces the tip of the cutter 46. Further, one end of a pipe 53 that supplies high pressure gas to the actuator 19 is connected to the communication hole 31C that communicates with the attachment hole 31b. The other end of the pipe 53 is connected to communicate with the cylinder chamber (not shown) of the actuator 19.

Therefore, as will be described later, when high-pressure gas is supplied to the actuator 19 from the pipe 53, a piston (not shown) in the actuator 19 is driven, and the driving force is transmitted to the shaft 20a of the valve portion 20. Therefore, the spherical valve body 20b coupled to the lower end of the shaft 20H rotates 90 degrees, and the valve portion 2o closes.

Further, the lower end of the shaft 20a is rotatably supported by a bearing 54a, and the end of the shaft 20a that protrudes laterally has a substantially square-shaped engagement (as viewed from the right side in FIG. 3). A portion 20a1 is provided. The above-mentioned manual opening/closing lever 21 has an engaging recess 21a engaged with this engaging part 20a1, and by rotating the lever 21, the valve body 20b is opened.
rotates to open and close the supply line 11.

In this manner, the emergency shutoff valve 12 includes a pressure sensing portion 15.degree. plunger solenoid mechanism 18. An opening mechanism 31. The containers 30 are stacked on top and bottom, and the valve portion 20. One actuator and one manual opening/closing lever 21 are integrated,
Its configuration is much smaller and W is simplified compared to the conventional one. Therefore, instead of individually installing multiple valves in the supply line 11, only one emergency shutoff valve 12 is installed, which makes the installation work easier than in the past. Since the installation space is small, it can be installed in a short time without being restricted in the installation location.

Here, the operation of the emergency shutoff valve 12 having the above structure will be explained.

As shown in FIGS. 1 and 4, secondary pressure on the downstream side of the control valve 13 is introduced into the chamber 33a of the pressure detection section 15 of the emergency shutoff valve 12 via a pipe 14. The secondary pressure is controlled by a control valve 13 for stable gas supply.
For example, when the secondary pressure rises abnormally due to a failure of the control valve 13 or the like, a downstream valve may be closed to ensure the safety of the supply line 11. For example, when the secondary pressure increases for such reasons, the bellofram 32' of the pressure sensing section 15 receives this pressure, but the secondary pressure does not reach around the preset pressure (set by the pressing force of the spring 37). It is in the lower position until it reaches.

However, when the secondary pressure increases further and reaches near the set pressure NJ, the bellofram 32 is moved to the lower plate 35. Together with the upper plate 36, it begins to move upward against the spring force of the spring 37. At the same time, the shaft 34 also moves upward. .

When the shaft 34 starts to move upward, the first spring 41
Although it is pressed to 0a and compressed, the second spring 42 is still in an uncompressed state. In this state, the engaging portion 43a of the hook 43 only contacts the engaging portion 18a1 of the plunger 18a, and the force for locking the needle 45 (the force for locking the needle 45 with the locking floor 50 is greater than the pressing force for pressing the hook 43 upward). sm force)
is larger, so the opening mechanism 31 does not operate.

As the secondary pressure continues to rise further, the upward movement of the shaft 34 causes the second spring 42 to also come into contact with the upper spring receiver 40b and be compressed. As a result, the pressing force that attempts to lift the hook 43 becomes the resultant force of the spring force of the first spring 41 and the spring force of the second spring force 42, which is greater than the force that locks the needle 45. Become.

In this way, the pressing force that moves the hook 43 upward increases rapidly, creating a toggle effect, and the hook 43 moves upward against the plunger 18.
It moves up ζ with a. As a result, the large diameter portion 45a of the needle 45 comes off from the rod 47, so that the needle 4
The small diameter portion 45b of No. 5 faces the locking floor 50. Accordingly, the locking bed 50 is displaced toward the inner circumferential side of the rod 47, and is spaced m from the step portion 51a that was previously abutted and locked.

Therefore, the rod 47 is released from the locking by the locking floor 50 and moves downward vigorously due to the pressing force of the spring 49. The cutter 46 at the lower end of the rod 47 is connected to the sealing plate 30 of the container 30.
Break through a.

The high-pressure gas generator that was sealed by the sealing plate 30a of the container 30 is ejected from the container 30 with the opening operation, and
It is supplied into the actuator 19 through the attachment hole 31b, the communication hole 31C2, and the piping 53. Accordingly, the shaft 20a of the valve section 20 is driven by the actuator 19 and rotates, and the valve body 20b performs a valve closing operation to cut off the supply line 11.

In this way, if an abnormal pressure increase occurs on the downstream side of the control valve 13, this is detected by the operation of the pressure detection section 15, and the valve section 20 is reliably closed to ensure the safety of gas supply. Ru.

Next, cases in which signals are output from the various sensors 16 will be explained.

For example, when an earthquake with a seismic intensity greater than a predetermined intensity occurs, or when a gas leak occurs, a detection signal thereof is output from the sensor 16 to the control circuit 17. The control circuit 17 then energizes the solenoid 18a of the plunger solenoid 14118.

By energizing the solenoid 18a, the plunger 18a moves upward and pulls up the needle 45.

As a result, as described above, the rod 47 due to the locking floor 50 is
The locking of the cutter 46 is released, and the cutter 46 then moves downward and removes the container 30.
Open. Then, the valve element 20b of the valve section 20 is driven by the actuator 17 to close the supply line 11.
is blocked.

Note that the plunger 18a is not directly transmitted with the displacement of the bellow ram 32 as described above, but is pulled upward by the spring force of the first spring 41 and the second spring 42, so that the load on the bellow ram 32 is transferred to the plunger 18a. is not transmitted. Therefore, the plunger solenoid mechanism 18
In this case, only the plunger t18a can be moved upward without operating the verofram 32 of the pressure sensing part 15, and an unreasonable load is applied to the plunger 18a, causing the solenoid 18b to move upward.
is prevented from being damaged.

Further, when the plunger 18a moves upward by the excitation of the solenoid 18b, the shaft 34 and the hook 43 are in the downward movement position. Therefore, although the plunger 18a enters the hook 43 and approaches the lower end of the shaft 34, it does not come into contact with the shaft 34, and the unlocking operation of the needle 45 is not hindered.

In addition, the worker must close the emergency shutoff valve 12. When going to the location where the control valve 13 is installed, the supply line 11 can be shut off without relying on the above-described operation of the pressure detection unit 15 and the plunger solenoid machine M418. That is, shaft 2
0a engaging portion 20a.

By manually rotating the manual opening/closing lever 21 by 90 degrees, the valve portion 20 is closed and the supply line 1 is closed.
1 is blocked.

In this way, the emergency shutoff valve 12 closes the valve unit 20 when the pressure detection unit 15 detects an abnormal increase in the secondary pressure of the control valve 13 or by remote control based on signals from various sensors 16. Additionally, the valve can also be closed manually.

Furthermore, when the secondary pressure increases and reaches the set pressure of the relief valve, the pressure detection section 26G+ (shown in FIG. 2) detects this and simultaneously opens the valve section. As a result, the downstream gas flows through the flow path 26 branched from the downstream piping 23.
more is released into the atmosphere, and the secondary pressure decreases. It should be noted that when the secondary pressure drops to below the operating set pressure of the pressure detection section 26C1, the valve section in the relief valve body 26c automatically closes, stopping gas release from the flow path 26.

In the above description, city gas was used as an example, but it goes without saying that the present invention can also be applied to lines that supply fluids such as other gases or liquids.

Further, in the above description, the normally open valve portion is closed, but the normally closed valve portion may be opened.

Effects of the Invention As described above, the emergency shutoff valve according to the present invention can be simplified in structure and downsized compared to conventional valves in which a plurality of valves are installed. The work is easier and the installation space is smaller, so the setting f[
Can be installed anywhere. Furthermore, by providing the pressure detection part and the plunger/solenoid mechanism coaxially, the plunger is not only displaced by the excitation of the solenoid, but also by the displacement of the pressure receiving body of the pressure detection part, and the opening mechanism operates to open the seal. Since the number of parts can be further reduced, the number of parts can be further reduced, and the failure rate can be lowered to improve reliability.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of an emergency shutoff valve according to the present invention, and FIGS. 2(A) to (E) are a front view and a left side view, respectively, showing a state in which the emergency shutoff valve is installed. Right side view, top view, bottom view, Fig. 3 is a longitudinal sectional view of the emergency shutoff valve, Fig. 4 is an enlarged longitudinal sectional view of the pressure detection part, and Fig. 5 is an enlarged longitudinal sectional view of the opening mechanism. The plan view and FIG. 6 are schematic configuration diagrams of a conventional emergency shutoff system. 12...Emergency shutoff valve, 13...Control valve, 15...
Pressure detection unit, 18... plunger solenoid mechanism,
19...actuator, 2o...valve part, 21...
- Manual opening/closing lever, 30... Container, 31... Opening mechanism, 32... Verofram, 41... First spring, 4
2... Second spring, 43... Hook, 45... Needle, 46... Cutter, 50... Locking method.

Claims (1)

[Claims] A valve section disposed in a flow path for feeding fluid, a manual opening/closing operation section that is manually operated to open and close the valve section, an actuator that drives the valve section to close or open the valve section; A container containing a high-pressure gas generator that serves as a driving source for the actuator;
a pressure detection section that receives pressure on the secondary side of the flow path and houses a pressure receiving body therein that is displaced in accordance with changes in pressure; and a hollow solenoid that is provided coaxially with the pressure detection section. and a plunger that passes through the solenoid and has one end connected to the pressure receiving body, and the displacement of the pressure receiving body is transmitted via the plunger, or the displacement of the plunger due to excitation of the solenoid is transmitted. and an unsealing mechanism for unsealing the container and supplying high pressure gas in the container to the actuator.