JP6829560B2 - Emergency shutoff valve device - Google Patents

Description

The present invention relates to an emergency shutoff valve device that is provided in the middle of a pipe that supplies a fluid such as city gas or petroleum and is used to shut off a flow path in the pipe in an emergency.

Generally, in the middle of a pipe for supplying a flammable fluid represented by city gas, the flow path in the pipe is cut off to stop the flow of the fluid in the event of an emergency such as an earthquake or a fire. An emergency shutoff valve device is provided (see, for example, Patent Document 1). An emergency shutoff valve device according to the prior art of this type includes a gas source that is operated by an external signal output in the event of an emergency to release gas, a cylinder to which gas is supplied from the gas source, and the cylinder. A piston provided inside that is displaced by gas supply from the gas source, and is driven in the valve closing direction when the piston is displaced in one direction and in the valve opening direction when the piston is displaced in the other direction. It is provided with a shutoff valve that is closed and a relief valve that releases the gas supplied into the cylinder to the atmosphere after the valve is closed.

Japanese Unexamined Patent Publication No. 8-61551

By the way, in the above-mentioned emergency shutoff valve device of the prior art, when the shutoff valve is opened after the valve is closed, gas is supplied into the cylinder in the direction opposite to that at the time of the valve closing to drive the piston in the valve opening direction. However, if the valve opening speed of the shutoff valve is too fast, the following problems occur. That is, since the gas supplied into the cylinder when the shutoff valve is closed is released to the atmosphere by the relief valve, if the gas is supplied into the cylinder in the opposite direction to that when the valve is closed in this state, the piston Is driven at a high speed in the valve opening direction.

As a result, the shutoff valve is opened rapidly, so that the pressure on the secondary side pipe (the pipe part of the pipe that supplies flammable fluid such as city gas, which is located downstream of the shutoff valve) is reduced. If it is pulled out, the inside of the piping on the secondary side is suddenly pressurized by opening the shutoff valve, which may damage the piping or piping equipment.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to be able to slow down the valve opening speed of the shutoff valve and suppress a sudden pressure change in the pipe. The purpose is to provide an emergency shutoff valve device.

In order to solve the above-mentioned problems, the present invention is operated by an external signal and is connected to a gas generation source that emits a gas, a flow passage through which a gas from the gas generation source flows, and the flow passage. A cylinder to which gas is supplied from a gas generation source, a piston provided in the cylinder and displaced by gas supply from the gas generation source, a piston rod coupled to the piston, and a direction intersecting the piston rod. A shutoff valve having a shaft extending in the direction of the valve, the shaft being driven in the valve closing direction by displacement of the piston in one direction, and driven in the valve opening direction by displacement of the piston in the other direction, and the distribution It is applied to an emergency shutoff valve device provided in a path and provided with a relief valve that releases the gas supplied into the cylinder to the atmosphere after the piston is displaced.

The feature of the configuration to which the present invention is employed, connected to the said cylinder, e Bei pressure regulating valve for adjusting the pressure in the cylinder, in the cylinder, when the shaft is driven in the opening direction It is defined as a first chamber located on the other side where the piston is displaced and a second chamber located on the one-way side where the piston is displaced when the shaft is driven in the valve closing direction. The pressure regulating valve is provided in each of the first chamber and the second chamber, and among the pressure regulating valves, the pressure regulating valve provided in the second chamber is the said. The pressure adjusting valve that constitutes the valve opening deceleration mechanism that reduces the displacement speed of the piston when the shutoff valve is driven in the valve opening direction due to the displacement of the piston in the other direction. The valve opening set pressure of the above is a pressure value lower than the valve opening set pressure of the pressure adjusting valve provided in the first chamber .

According to the present invention, when the shutoff valve is closed and then opened again, the valve opening reduction mechanism reduces the displacement speed of the piston so as to slow it down, so that the shutoff valve can be opened slowly. It is possible to prevent the inside of the next side pipe from being suddenly pressurized. As a result, it is possible to prevent the inside of the secondary side piping from being suddenly pressurized and damaging the piping or the piping equipment.

It is a block diagram which shows the emergency shutoff valve device by 1st Embodiment of this invention. It is a circuit block diagram which shows typically the structure of the actuator which drives a shut-off valve in FIG. FIG. 5 is a circuit configuration diagram showing a state in which the actuator in FIG. 2 is driven to a fully closed position of a shutoff valve. It is a circuit block diagram which shows the state which drives the actuator in FIG. 3 in the valve opening direction of a shutoff valve. It is a circuit block diagram which shows typically the structure of the emergency shutoff valve device by 2nd Embodiment. It is a circuit block diagram which shows typically the structure of the emergency shutoff valve device by 3rd Embodiment. It is a circuit block diagram which shows typically the structure of the emergency shutoff valve device by 4th Embodiment. It is a circuit block diagram which shows typically the structure of the emergency shutoff valve device by 5th Embodiment.

Hereinafter, the emergency shutoff valve device according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8 of the accompanying drawings.

Here, FIGS. 1 to 4 show the first embodiment. The emergency shutoff valve device 1 according to the present embodiment is provided in the middle of a pipeline 100 for supplying a flammable fluid typified by city gas, for example, and emergency shutoff of the pipeline 100 in the event of an earthquake or fire, for example. It is a valve device. The emergency shutoff valve device 1 is composed of a shutoff valve 2 provided in the middle of a pipeline 100 such as a city gas line to open and close a flow path, and an actuator 7 to open and close the shutoff valve 2. ing.

Taking a city gas line as an example of the pipeline 100, the emergency shutoff valve device 1 is installed in various industrial facilities or in the premises of a building such as a condominium (specifically, near the entrance). For example, in an emergency when an earthquake occurs, in order to prevent gas leakage due to damage to the gas pipe, the shutoff valve 2 is urgently shut off (closed) by the actuator 7, and the gas supply can be stopped urgently.

As shown in FIG. 1, the shutoff valve 2 is provided in a tubular valve casing 3 connected in the middle of the pipeline 100 and rotatably provided in the valve casing 3, and a flow in the valve casing 3. The ball valve body 4 that opens and closes the path is disposed at a distance from the upstream side and the downstream side of the valve casing 3, and between the outer peripheral surface of the ball valve body 4 and the inner circumference of the valve casing 3. It is configured to include the sealing members 5 and 5 to be sealed and a shaft (hereinafter, referred to as a rotating shaft 6) for rotating the ball valve body 4. The ball valve body 4 is provided with a circular hole 4A extending in the radial direction (direction perpendicular to the axis of the rotating shaft 6).

When the shutoff valve 2 is opened, the circular hole 4A of the ball valve body 4 communicates the pipeline 100 with the flow path in the valve casing 3. On the other hand, when the ball valve body 4 is rotated by about 90 degrees by the rotation shaft 6, the circular hole 4A of the ball valve body 4 is disconnected from the flow path in the valve casing 3, and the conduit 100 is the shutoff valve 2. It becomes a state of being blocked by. The shutoff valve 2 may have a valve structure of a type that opens or closes by rotating a valve body (for example, a butterfly valve body) other than the ball valve body 4.

The actuator 7 for driving the shutoff valve 2 in the opening and closing directions is an actuator case 7A fixed to the upper part of the shutoff valve 2 (valve casing 3) and a cylinder integrally provided with the actuator case 7A. The device 7B and a rotary lever 8 described later are included. Inside the actuator case 7A, an output shaft 6A connected to the rotation shaft 6 of the shutoff valve 2 is rotatably provided via a bearing (not shown) or the like. The output shaft 6A may be formed integrally with the rotating shaft 6 or may be formed separately. That is, the output shaft 6A may be a shaft that is integrally rotated with the rotating shaft 6, and it is not necessary to form the rotating shaft 6 and the output shaft 6A as an integral body.

The output shaft 6A is arranged so as to extend upward and downward in the actuator case 7A, and the output shaft 6A is provided with, for example, a rotating lever 8 extending in the horizontal direction fitted therein. As a result, the rotary lever 8 is integrally rotated with the output shaft 6A (that is, the rotary shaft 6). As shown in FIGS. 2 to 4, the rotary lever 8 has two lever portions 8A and 8B (hereinafter, referred to as a first lever portion 8A and a second lever portion 8B).

The tip end side of the first lever portion 8A of the rotary lever 8 is rotatably connected to the piston rod 11 described later via a connector 14, and the output shaft 6A (shutoff valve 2) follows the movement of the piston rod 11. The rotation shaft 6) of the above is rotated together with the rotation lever 8. The second lever portion 8B extends toward a side substantially opposite to the first lever portion 8A with the output shaft 6A interposed therebetween, and the tip end side thereof is arranged so that the relief valves 21A and 21B described later can be switched.

That is, the second lever portion 8B of the rotary lever 8 is counterclockwise around the output shaft 6A as shown in FIG. 2 when the piston 10 is displaced in the direction of arrow A to the fully open position of the shutoff valve 2. It is rotated. As a result, the second lever portion 8B pushes the second relief valve 21B so as to switch from the valve closing position (d) to the valve opening position (e) on the tip side thereof. On the other hand, when the piston 10 is displaced in the arrow B direction to the fully closed position of the shutoff valve 2, the second lever portion 8B of the rotary lever 8 rotates clockwise around the output shaft 6A as shown in FIG. Be moved. As a result, the second lever portion 8B pushes the first relief valve 21A so as to switch from the valve closing position (d) to the valve opening position (e) on the tip end side thereof. As described above, the second lever portion 8B of the rotary lever 8 is configured to switch the first and second relief valves 21A and 21B in accordance with the movement of the piston rod 11.

The cylinder device 7B of the actuator 7 is provided with a cylinder 9 fixed to the left end surface of the actuator case 7A and slidably inserted into the cylinder 9, and the inside of the cylinder 9 is provided with two chambers 9A and 9B. A piston 10 defined in the above, a piston rod 11 having one end (left end) side integrally fixed to the piston 10 and the other end side protruding outside the cylinder 9, and arranged between the actuator case 7A and the cylinder 9. It is configured to include a rod guide 12 that supports a piston rod 11 extending axially from the inside of the cylinder 9 into the actuator case 7A so as to be slidable and displaceable.

The protruding end (right end) side of the piston rod 11 penetrates the actuator case 7A and protrudes outward from the right end surface of the actuator case 7A, and the outer peripheral surface thereof is protected by the tubular cover 13. Further, the piston rod 11 is oriented in the left and right directions (arrows A and B directions) in FIGS. 1 and 2 so that the inside of the actuator case 7A is orthogonal to the output shaft 6A (that is, the rotation shaft 6 of the shutoff valve 2). ) Extends. The tip end side of the rotary lever 8 (first lever portion 8A) is rotatably connected to the intermediate portion of the piston rod 11 via the connector 14 and slidably slidable in the length direction.

Therefore, when the piston 10 and the piston rod 11 are displaced in the arrow A direction (or arrow B direction), the rotating lever 8 is pressed by the connector 14 and rotated counterclockwise (or clockwise). , The output shaft 6A (that is, the rotation shaft 6 of the shutoff valve 2) is rotated in the same direction. Therefore, when the piston rod 11 is displaced in the direction A indicated by the arrow, this linear displacement is converted into rotation (rotational displacement) of the output shaft 6A by the rotating lever 8, and the ball valve body 4 of the shutoff valve 2 It is driven in the valve opening direction by the rotating shaft 6. On the other hand, when the piston rod 11 is displaced in the arrow B direction, the ball valve body 4 of the shutoff valve 2 is driven by the rotation shaft 6 in the valve closing direction.

In other words, the shutoff valve 2 has a shaft (rotating shaft 6 and output shaft 6A) extending in a direction intersecting the piston rod 11, and this shaft is directed to one direction of the piston 10 (direction indicated by arrow B). It is driven in the valve closing direction by the displacement, and is driven in the valve opening direction by the displacement of the piston 10 in the other direction (direction A indicated by the arrow). Here, the shutoff valve 2 switches from fully open to fully closed when the rotation shaft 6 rotates by about 90 degrees.

As shown in FIGS. 2 to 4, the inside of the cylinder 9 is defined by the piston 10 into a first chamber 9A and a second chamber 9B. Of these, the first high-pressure gas supply unit 15A, which is a gas generation source, is connected to the first chamber 9A via a first flow passage 16A for supplying and discharging gas, and the first flow passage 16A is closed. It constitutes a diversion passage. Further, a second high-pressure gas supply unit 15B, which is another gas generation source, is connected to the second chamber 9B via a second flow passage 16B for gas supply / exhaust, and the second flow passage 16B is connected to the second chamber 9B. It constitutes a flow passage for valve opening.

The first and second high-pressure gas supply units 15A and 15B include a container (gas source) in which a high-pressure gas (for example, nitrogen gas, carbon gas, etc.) is sealed inside, and an opening mechanism (opening mechanism) for opening this container in an emergency. (Not shown) and is included. The first and second high-pressure gas supply units 15A and 15B serve as a drive source for the emergency shutoff valve device 1, and a carbon dioxide gas cartridge capable of generating a large initial torque is used as the container. For example, when gas (high pressure carbon dioxide) from the first high pressure gas supply unit 15A is supplied into the cylinder 9 of the actuator 7, the piston 10 operates by the pressure, and the shutoff valve 2 linked with the piston rod 11 operates. The rotation shaft 6 (output shaft 6A) of the above rotates in the valve closing direction, and the shutoff valve 2 is instantly closed.

As a device for ejecting carbon dioxide gas from the carbon dioxide gas cartridge (that is, the opening mechanism), for example, a device called a power unit is used. When power is supplied to this power unit with the carbon dioxide cartridge attached, the built-in cutter breaks the sealing plate of the carbon dioxide cartridge (neither is shown) and ejects carbon dioxide gas. That is, gas (high-pressure carbon dioxide gas) is supplied so as to be ejected from the containers of the first and second high-pressure gas supply units 15A and 15B into the first and second flow passages 16A and 16B.

Here, when the gas from the first high-pressure gas supply unit 15A flows through the first flow passage 16A, this gas is supplied into the first chamber 9A of the cylinder 9, and the piston 10 is indicated by the pressure. Push in the B direction. On the other hand, when the gas from the second high-pressure gas supply unit 15B flows through the second flow passage 16B, this is supplied into the second chamber 9B of the cylinder 9, and the piston 10 is indicated by the pressure of the gas. Push in the direction.

A bleed valve 17 as an exhaust valve for exhausting (opening) the internal gas to the atmosphere is provided between the first and second flow passages 16A and 16B. The bleed valve 17 is composed of, for example, directional control valves at three ports and three positions, and springs 18A and 18B that constantly urge the bleed valve 17 toward the neutral position (a) on both the left and right sides thereof, and a first. , The pilot portions 19A and 19B are provided so that the gas pressure in the second flow passages 16A and 16B is supplied as the pilot pressure.

The bleed valve 17 shuts off the first and second flow passages 16A and 16B with respect to the exhaust unit 20 at the normal time in the neutral position (a), and the gas in the first and second flow passages 16A and 16B is released. Prevents it from being released to the atmosphere through the bleed valve 17. When the gas pressure in the first flow passage 16A is supplied to the pilot portion 19A, the bleed valve 17 is switched from the neutral position (a) to the switching position (b) against the spring 18B. The inside of the second flow passage 16B is opened to the atmosphere via the exhaust unit 20. On the other hand, when the gas pressure in the second flow passage 16B is supplied to the pilot portion 19B (see FIG. 4), the bleed valve 17 switches from the neutral position (a) to the switching position (c) against the spring 18A. At this time, the inside of the first flow passage 16A is opened to the atmosphere via the exhaust unit 20.

The first and second relief valves 21A and 21B are provided in branch pipes 22A and 22B branched from intermediate portions of the first and second flow passages 16A and 16B. The first and second relief valves 21A and 21B are normally in the valve closing position (d) and shut off the branch pipelines 22A and 22B from the atmosphere. However, when the first and second relief valves 21A and 21B are switched from the valve closing position (d) to the valve opening position (e), the branch pipelines 22A and 22B communicate with the atmosphere and the cylinders. The excess gas supplied into the chambers 9A and 9B of 9 is released to the atmosphere.

That is, when the gas from the second high-pressure gas supply unit 15B is supplied into the second chamber 9B of the cylinder 9 via the second flow passage 16B, the piston 10 is moved in the direction of arrow A by the pressure of the gas. Be pushed. Then, when the piston 10 is displaced in the arrow A direction to the position where the shutoff valve 2 is fully opened, the rotary lever 8 is largely rotated counterclockwise as shown in FIG. 2, and the second lever portion 8B provides a second lever portion 8. The relief valve 21B is switched from the valve closing position (d) to the valve opening position (e). In this way, in the state where the second relief valve 21B is switched to the valve opening position (e), the excess gas supplied (filled) in the chamber 9B of the cylinder 9 branches into the second flow passage 16B. It is discharged (opened) to the atmosphere through the pipeline 22B and the second relief valve 21B.

On the other hand, when the gas from the first high-pressure gas supply unit 15A is supplied into the chamber 9A of the cylinder 9 via the first flow passage 16A, the piston 10 is pushed in the direction B indicated by the gas pressure. To. Then, when the piston 10 is displaced in the arrow B direction to the position where the shutoff valve 2 is fully closed, the rotary lever 8 is largely rotated clockwise as shown in FIG. 3, and the second lever portion 8B causes the first lever portion 8B. The relief valve 21A is switched from the valve closing position (d) to the valve opening position (e). In this way, when the first relief valve 21A is switched to the valve opening position (e), the excess gas supplied (filled) in the chamber 9A of the cylinder 9 branches into the first flow passage 16A. It is discharged (opened) to the atmosphere through the pipeline 22A and the first relief valve 21A.

In other words, after the piston 10 is displaced in the directions A and B to the position where the shutoff valve 2 is fully opened or fully closed, the gas supplied (filled) in the chambers 9A and 9B of the cylinder 9 is released to the atmosphere. Therefore, the first and second relief valves 21A and 21B are switched from the valve closing position (d) to the valve opening position (e) by the second lever portion 8B of the rotating lever 8. As a result, the first and second relief valves 21A and 21B can prevent the inside of the chambers 9A and 9B of the cylinder 9 from being maintained in a high pressure state after the shutoff valve 2 is fully opened or fully closed. The opening and closing operations of the shutoff valve 2 can be facilitated.

The first and second safety valves 23A and 23B are pressure adjusting valves for adjusting the pressure in the chambers 9A and 9B of the cylinder 9. The first and second safety valves 23A and 23B are the first when high-pressure gas is supplied from the first and second high-pressure gas supply units 15A and 15B into the first and second flow passages 16A and 16B. , The pressure in the chambers 9A and 9B of the second flow passages 16A and 16B and the cylinder 9 is suppressed from rising above a predetermined set pressure, and the excess pressure is relieved to the outside (atmosphere). The first and second safety valves 23A and 23B are provided so that the pressure in the first and second chambers 9A and 9B of the cylinder 9 and the first and second flow passages 16A and 16B does not rise too much. There is.

Here, the first safety valve 23A is set to a valve opening pressure of, for example, about 0.99 MPa, and the pressure in the first flow passage 16A and the first chamber 9A rises above this valve opening pressure (set pressure). It suppresses the pressure and relieves the excess pressure to the outside (atmosphere). The second safety valve 23B is set to a valve opening pressure of, for example, about 0.6 MPa, and the pressure in the second flow passage 16B and the second chamber 9B rises above this valve opening pressure (set pressure). Suppress and relieve excess pressure to the outside (atmosphere).

In the first embodiment, the second safety valve 23B has a displacement speed of the piston 10 when the shutoff valve 2 is driven in the valve opening direction by the displacement of the piston 10 in the direction of arrow A in the cylinder 9. It constitutes a valve opening deceleration mechanism that reduces the displacement. Therefore, the second safety valve 23B is set to a valve opening pressure that is, for example, 0.39 MPa (0.99 MPa-0.6 MPa) lower than the valve opening pressure of the first safety valve 23A. As a result, when the shutoff valve 2 is opened, the pressure in the chamber 9B of the cylinder 9 is made lower than when the valve is closed (that is, the pressure supplied into the first chamber 9A when the valve is closed), and the piston 10 is operated. The propulsive force in the valve opening direction can be suppressed, and the ball valve body 4 (see FIG. 1) of the shutoff valve 2 can be slowly opened.

The emergency shutoff valve device 1 according to the first embodiment has the above-described configuration, and its operation will be described next.

Normally, the shutoff valve 2 is held in the open state. As shown in FIG. 1, the ball valve body 4 of the shutoff valve 2 is in a state of communicating with the flow path of the pipeline 100, and in the cylinder device 7B of the actuator 7, the piston 10 and the piston rod 11 are indicated by arrows as shown in FIG. Displaced in the A direction, the rotary lever 8 is rotated counterclockwise together with the output shaft 6A (that is, the rotary shaft 6 of the shutoff valve 2).

Here, for example, it is assumed that an earthquake exceeding a predetermined seismic intensity has occurred. The occurrence of an earthquake is immediately detected by a seismic sensor (not shown), and the seismic sensor outputs an emergency signal. The first high-pressure gas supply unit 15A supplies a gas (high-pressure carbon dioxide gas) from the inside of the container into the first flow passage 16A by being supplied with a signal from the seismic sensor. The high-pressure gas flowing in the first flow passage 16A is supplied into the chamber 9A of the cylinder 9.

Further, the bleed valve 17 is supplied with the gas pressure from the first flow passage 16A to the pilot portion 19A to switch from the neutral position (a) to the switching position (b). As a result, the second flow passage 16B is connected to the exhaust portion 20 by the bleed valve 17, and the chamber 9B in the cylinder 9 is opened to the atmosphere through the second flow passage 16B and is equivalent to the atmospheric pressure. It is kept in a low pressure state.

Therefore, the piston 10 in the cylinder 9 is rapidly displaced in the arrow B direction by using the pressure of the high pressure gas generated in the first high pressure gas supply unit 15A as a driving force. Then, the piston rod 11 is also displaced in the same direction as the piston 10, and the piston rod 11 rotates the rotation lever 8 together with the output shaft 6A in the clockwise direction via the connector 14. As a result, the rotating shaft 6 coupled to the output shaft 6A is rotated by about 90 ° in the same direction, and the ball valve body 4 is rotated to the valve closing position of the shutoff valve 2 to urgently shut off the pipeline 100. ..

As shown in FIG. 3, when the piston 10 is largely displaced in the arrow B direction to the position where the shutoff valve 2 is fully closed, the rotary lever 8 is rotated clockwise, so that the second lever portion 8B The first relief valve 21A is operated so as to be switched from the valve closing position (d) to the valve opening position (e) on the tip side. Therefore, the first relief valve 21A switched to the valve opening position (e) has a second flow passage so as to discharge the excess gas supplied (filled) into the chamber 9B of the cylinder 9 to the outside. It is discharged (opened) to the atmosphere through 16B and the branch line 22B.

Next, after the earthquake has subsided and safety has been confirmed, it is necessary to open the shutoff valve 2 in the fully closed state so that, for example, the supply of city gas can be resumed. When opening the shutoff valve 2, a valve opening signal may be input to the second high-pressure gas supply unit 15B by operating an operation panel (not shown) or the like. That is, when the solenoid (not shown) is excited by the supply of the valve opening signal, the second high-pressure gas supply unit 15B performs the same opening operation as the first high-pressure gas supply unit 15A described above.

As a result, the high-pressure gas is supplied from the second high-pressure gas supply unit 15B into the second flow passage 16B in the direction indicated by arrow F in FIG. 4, and the high-pressure gas flowing in the second flow passage 16B becomes It is supplied into the chamber 9B of the cylinder 9. Further, the high-pressure gas at this time is supplied to the pilot portion 19B of the bleed valve 17 via the second flow passage 16B, and the bleed valve 17 starts from the neutral position (a) against the spring 18A as shown in FIG. It switches to the switching position (c). As a result, the first flow passage 16A is connected to the exhaust portion 20 by the bleed valve 17, and the chamber 9A in the cylinder 9 is opened to the atmosphere through the first flow passage 16A and is equivalent to atmospheric pressure. It is kept in a low pressure state.

Therefore, the piston 10 in the cylinder 9 is displaced in the arrow A direction by using the pressure of the high pressure gas generated in the second high pressure gas supply unit 15B as a driving force. Then, the piston rod 11 is also displaced in the same direction together with the piston 10, and the piston rod 11 rotates the rotation lever 8 together with the output shaft 6A in the counterclockwise direction via the connector 14. As a result, the rotating shaft 6 coupled to the output shaft 6A is rotated in the same direction, and the ball valve body 4 of the shutoff valve 2 is rotated in the valve opening direction to bring the pipeline 100 into a communicating state.

By the way, if the valve opening speed of the shutoff valve 2 is too fast, the following problems occur. That is, the gas supplied into the chamber 9A of the cylinder 9 when the shutoff valve 2 is closed is released to the atmosphere by the relief valve 21A as shown in FIG. 3, so that the state is opposite to that when the valve is closed. When the gas is supplied into the chamber 9B of the cylinder 9 in the direction, the piston 10 is driven at a high speed in the valve opening direction. Further, as shown in FIG. 4, when the piston 10 starts to move in the valve opening direction (direction indicated by arrow A), the bleed valve 17 switches from the neutral position (a) to the switching position (c), and the cylinder 9 Since the inner chamber 9A is opened to the atmosphere through the first flow passage 16A, the piston 10 is driven at a high speed in the valve opening direction (direction of arrow A).

In this way, when the shutoff valve 2 is rapidly opened, the secondary side pipe located on the downstream side of the shutoff valve 2 in the pipeline 100 for supplying flammable fluid such as city gas When the pressure is released, the inside of the piping on the secondary side is suddenly pressurized by opening the shutoff valve 2, which may damage the piping or the piping equipment. In the unlikely event that the piping is damaged, there is concern that it may cause gas leaks.

In general, when introducing city gas into the piping on the secondary side under atmospheric pressure (0 MPa), it is basic to slowly open the shutoff valve 2 and gradually introduce the gas so as to ensure safety. .. However, when a high-pressure gas supply unit 15B such as a carbon dioxide gas cartridge is used as a drive source, carbon dioxide gas is ejected from the high-pressure gas supply unit 15B at once to close (operate) the shutoff valve 2, so that it should be gradually introduced. Is difficult. Further, since the types of carbon dioxide gas cartridges (high-pressure gas supply units 15A and 15B) are limited, it is difficult to select carbon dioxide gas cartridges of any size and pressure.

Therefore, in the first embodiment, when the shutoff valve 2 is driven in the valve opening direction by the displacement of the piston 10 in the direction of arrow A in the cylinder 9, the displacement speed of the piston 10 is reduced. It is provided with a valve opening / deceleration mechanism including a second safety valve 23B, and is configured to adjust the pressure in the chamber 9B of the cylinder 9 to a relatively low pressure. That is, the second safety valve 23B is set to a pressure lower than that of the first safety valve 23A by, for example, 0.39 MPa (for example, a set pressure of about 0.6 MPa).

Therefore, during the valve opening operation of the shutoff valve 2, the pressure in the chamber 9B of the cylinder 9 is set to a lower pressure by the second safety valve 23B, and the valve opening direction of the piston 10 (direction indicated by arrow A in FIG. 4). This makes it possible to suppress the propulsive force of the shutoff valve 2 so that the ball valve body 4 of the shutoff valve 2 can be opened more slowly than when the valve is closed.

Therefore, according to the first embodiment, it is possible to provide an emergency shutoff valve device 1 that automatically performs a valve opening operation after the shutoff valve 2 is closed, and the shutoff valve 2 is closed. Can be performed urgently and quickly, and the valve opening operation can be performed slowly and slowly. That is, the valve closing operation of the shutoff valve 2 is performed instantaneously, and the valve opening operation reduces the propulsive force of the piston 10 by lowering the pressure of the gas (high-pressure carbon dioxide gas) supplied into the chamber 9B of the cylinder 9. The shutoff valve 2 can be slowly opened. As a result, the inside of the piping on the secondary side is not suddenly pressurized when the shutoff valve 2 is opened, and the durability and life of the piping or piping equipment can be improved.

In the first embodiment, the case where the first and second safety valves 23A and 23B are connected to the chambers 9A and 9B of the cylinder 9 will be described as an example. However, the present invention is not limited to this, and for example, the first and second safety valves 23A and 23B may be connected and provided in the middle of the first and second flow passages 16A and 16B. Even in this case, the pressure in the chambers 9A and 9B of the cylinder 9 can be individually adjusted by the first and second safety valves 23A and 23B.

Next, FIG. 5 shows a second embodiment. In the present embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. However, the feature of the second embodiment is that the check valve 31 and the throttle 32 are provided on the piston 10 in the cylinder 9.

Here, the check valve 31 and the throttle 32 are arranged in series on the piston 10 in the cylinder 9. The check valve 31 allows the gas to flow from the second chamber 9B to the first chamber 9A in the cylinder 9, and conversely, the gas flows from the first chamber 9A to the second chamber 9B. It is a configuration that prevents distribution. Further, the throttle 32 exerts a throttle action on the gas flowing from the second chamber 9B to the first chamber 9A in the cylinder 9 through the check valve 31, and the second chamber 9B to the first chamber 9A. It is configured to suppress the flow rate of the gas discharged to.

In this case, the check valve 31 and the throttle 32 provided on the piston 10 form a valve opening deceleration mechanism that reduces the speed at which the piston 10 is displaced in the valve opening direction (arrow pointing A direction) of the shutoff valve 2. .. The second safety valve 23B is set to a pressure lower than that of the first safety valve 23A (for example, a set pressure of about 0.6 MPa) as in the first embodiment, and constitutes a part of the valve opening speed reduction mechanism. You may. However, in the second embodiment, the second safety valve 23B may be set to the same set pressure as the first safety valve 23A (for example, about 0.99 MPa).

Thus, in the second embodiment configured as described above, after the shutoff valve 2 is closed, the high pressure gas from the second high pressure gas supply unit 15B is passed through the second flow passage 16B to the chamber 9B of the cylinder 9. The shutoff valve 2 can be driven in the valve opening direction by the displacement of the piston 10 in the cylinder 9 in the direction of arrow A. At this time, the check valve 31 provided on the piston 10 in the cylinder 9 allows gas to flow from the second chamber 9B in the cylinder 9 to the first chamber 9A, and the check valve 31 and the check valve 31 The throttle 32 provided in series exerts a throttle action on the gas flowing through the check valve 31, and can suppress the flow rate of the gas discharged from the second chamber 9B to the first chamber 9A.

Therefore, the check valve 31 suppresses a sudden increase in pressure in the chamber 9B of the cylinder 9 due to the high pressure gas from the second high-pressure gas supply unit 15B, and the throttle 32 makes the gas in the chamber 9B the chamber 9A. It can be gradually discharged toward. As a result, the check valve 31 and the throttle 32 can reduce the displacement speed of the piston 10 in the valve opening direction (direction indicated by arrow A in FIG. 4).

Therefore, according to the second embodiment, the valve closing operation of the shutoff valve 2 is performed instantaneously, and the valve opening operation lowers the pressure in the second chamber 9B to reduce the propulsive force of the piston 10 and shuts off. The valve 2 can be opened slowly. As a result, the inside of the piping on the secondary side is not suddenly pressurized when the shutoff valve 2 is opened, and the durability and life of the piping or piping equipment can be improved.

Next, FIG. 6 shows a third embodiment. In the present embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. However, a feature of the third embodiment is that a regulating valve 41 for variably adjusting the pressure or flow rate of the gas flowing in the flow passage is provided in the middle of the valve opening flow passage (second flow passage 16B). It is in that.

The adjusting valve 41 constitutes a valve opening deceleration mechanism that reduces the displacement speed of the piston 10 in the valve opening direction (direction indicated by arrow A). The second safety valve 23B is set to a pressure lower than that of the first safety valve 23A (for example, a set pressure of about 0.6 MPa) as in the first embodiment, and constitutes a part of the valve opening speed reduction mechanism. You may. However, in the third embodiment, the second safety valve 23B may be set to the same set pressure as the first safety valve 23A (for example, about 0.99 MPa).

Here, the adjusting valve 41 is located between the second chamber 9B of the cylinder 9 and the second high-pressure gas supply unit 15B and is provided in the middle of the second flow passage 16B, and is provided in the flow passage 16B. It constitutes a discharge valve that discharges the flowing gas to the outside. The regulating valve 41 is finely operated by manual or automatic control, and when the high-pressure gas supply unit 15B is activated and a gas (high-pressure carbon dioxide gas) is ejected into the second flow passage 16B, a part of the gas is ejected. Is discharged from the regulating valve 41 into the outside atmosphere at a small flow rate.

Thus, in order to open the shutoff valve 2 in the fully closed state, the gas supplied from the high pressure gas supply unit 15B to the second chamber 9B of the cylinder 9 via the second flow passage 16B is inside the cylinder 9. The pressure rise at the above is suppressed by the regulating valve 41. As a result, the propulsive force of the piston 10 in the arrow A direction in the cylinder 9 can be reduced, and the shutoff valve 2 can be opened more slowly than when the valve is closed.

Therefore, even in the third embodiment configured as described above, the valve opening operation of the shutoff valve 2 is slowed down in substantially the same manner as in the second embodiment, and the inside of the secondary side pipe is filled with the shutoff valve 2. The pressure is not suddenly applied when the valve is opened, and the durability and life of the piping or piping equipment can be improved. In particular, in the third embodiment, since the amount of gas released can be adjusted by adjusting the opening degree of the regulating valve 41, the valve opening speed (operating speed) of the shutoff valve 2 at the site where the emergency shutoff valve device 1 is installed. Can be adjusted.

Next, FIG. 7 shows a fourth embodiment. In the present embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. However, a feature of the fourth embodiment is that a spare tank 51 for adjusting the pressure or flow rate of the gas flowing in the flow passage is provided in the middle of the valve opening flow passage (second flow passage 16B). There is.

The spare tank 51 constitutes a valve opening deceleration mechanism that reduces the displacement speed of the piston 10 in the valve opening direction (direction indicated by arrow A). The second safety valve 23B is set to a pressure lower than that of the first safety valve 23A (for example, a set pressure of about 0.6 MPa) as in the first embodiment, and constitutes a part of the valve opening speed reduction mechanism. You may. However, in the fourth embodiment, the second safety valve 23B may be set to the same set pressure as the first safety valve 23A (for example, about 0.99 MPa).

Here, in the spare tank 51, in order to open the shutoff valve 2 in the fully closed state, the high-pressure gas supply unit 15B operates and gas (high-pressure carbon dioxide gas) is ejected into the second flow passage 16B. Occasionally, a part of this gas is stored in the spare tank 51 as a buffer tank. Therefore, the pressure of the gas supplied from the high-pressure gas supply unit 15B to the second chamber 9B of the cylinder 9 via the second flow passage 16B can be reduced according to the capacity of the spare tank 51. As a result, the spare tank 51 can reduce the propulsive force of the piston 10 in the direction of arrow A in the cylinder 9 and slowly open the shutoff valve 2.

Thus, even in the fourth embodiment configured as described above, the valve opening operation of the shutoff valve 2 is slowed down in substantially the same manner as in the second embodiment, and the inside of the secondary side pipe is the shutoff valve 2. The pressure is not suddenly applied when the valve is opened, and the durability and life of the piping or piping equipment can be improved. In particular, in the fourth embodiment, since the displacement speed of the piston 10 can be adjusted according to the capacity of the spare tank 51, the valve opening speed (operation) of the shutoff valve 2 even at the site where the emergency shutoff valve device 1 is installed. The speed) can be adjusted.

Next, FIG. 8 shows a fifth embodiment. In the present embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. However, a feature of the fifth embodiment is that the bleed valve 17 is provided with a valve opening deceleration mechanism that reduces the displacement speed of the piston 10 in the valve opening direction (direction indicated by arrow A).

Here, the valve opening / deceleration mechanism according to the fifth embodiment is composed of a throttle 61 provided at the switching position (c) of the bleed valve 17. In this case, the second safety valve 23B is set to a pressure lower than that of the first safety valve 23A (for example, a set pressure of about 0.6 MPa) as in the first embodiment, and is a part of the valve opening speed reduction mechanism. May be configured. However, in the fifth embodiment, the second safety valve 23B may be set to the same set pressure as the first safety valve 23A (for example, about 0.99 MPa).

In order to open the shutoff valve 2 in the fully closed state, the bleed valve 17 is operated when the second high-pressure gas supply unit 15B is operated and gas (high-pressure carbon dioxide gas) is ejected into the second flow passage 16B. Is supplied with gas pressure from the second flow passage 16B to the pilot unit 19B, and switches from the neutral position (a) to the switching position (c) as illustrated in FIG. As a result, the first flow passage 16A is connected to the exhaust portion 20 by the bleed valve 17, and the second chamber 9A in the cylinder 9 is opened to the atmosphere through the first flow passage 16A.

However, in the fifth embodiment, since the throttle 61 is provided at the switching position (c) of the bleed valve 17, the gas released from the chamber 9A in the cylinder 9 to the atmosphere through the first flow passage 16A. The flow rate of the gas can be limited by the throttle 61, and the flow rate of the gas discharged from the cylinder 9 to the flow passage 16A can be reduced so as to be throttled. As a result, the chamber 9A in the cylinder 9 is boosted by the throttle 61 so that the pressure becomes higher than the atmospheric pressure, and the pressure difference between the first and second chambers 9A and 9B is reduced small. As a result, the piston 10 is decelerated so that the displacement speed in the valve opening direction (direction of arrow A) in the cylinder 9 becomes slow, and the shutoff valve 2 can be slowly opened.

Thus, even in the fifth embodiment configured as described above, when the shutoff valve 2 is closed and then reopened, the throttle 61 provided at the switching position (c) of the bleed valve 17 displaces the piston 10. The speed can be reduced so as to slow down, the shutoff valve 2 can be slowly opened in substantially the same manner as in the second embodiment, and the inside of the secondary side pipe is prevented from being suddenly pressurized. Can be done.

In the first embodiment, the first safety valve 23A is set to a valve opening pressure of, for example, about 0.99 MPa, and the second safety valve 23B is set to a valve opening pressure of, for example, about 0.6 MPa. Was explained as an example. However, the present invention is not limited to this, and the set values of the safety valves 23A and 23B can be changed according to, for example, the torque for rotating the rotation shaft 6 of the shutoff valve 2. Further, the rotation shaft 6 is also rotated with respect to the flow path diameter of the throttle 32 in the second embodiment, the volume of the spare tank 51 in the fourth embodiment, and the flow path diameter of the throttle 61 in the fifth embodiment. It can be changed according to the torque to be operated.

Further, in each of the above-described embodiments, for example, an emergency shutoff valve device 1 provided in the middle of piping of a city gas line or the like has been described as an example. However, the emergency shutoff valve device according to the present invention is not limited to this, and may be provided in the middle of a pipe or the like through which various fluids containing a gas such as hydrogen, a liquefied gas, or a liquid flow.

Next, the inventions included in each of the above embodiments will be described. That is, the valve opening / reducing mechanism is configured to suppress the pressure of the gas supplied from the gas generation source to the cylinder. In this case, the valve opening reduction mechanism can reduce the pressure of the gas supplied from the gas generation source to the cylinder so as to keep it low. As a result, the displacement speed of the piston can be slowed down and the shutoff valve can be slowly opened.

Further, the valve opening / deceleration mechanism is configured to suppress the flow rate of the gas discharged from the cylinder. In this case, the valve opening speed reduction mechanism can reduce the flow rate of the gas discharged from the cylinder. As a result, the displacement speed of the piston can be slowed down and the shutoff valve can be slowly opened.

On the other hand, the flow passage includes a valve opening flow passage to which a gas for displacing the piston in the valve opening direction is supplied, and the valve opening deceleration mechanism is a valve-opening flow passage for the gas flowing in the valve opening flow passage. It consists of a regulating valve that regulates the pressure. As a result, the adjusting valve can adjust the pressure of the gas flowing in the valve opening flow passage, so that the pressure of the gas supplied into the cylinder can be suppressed low, and the piston opens the shutoff valve. The speed of displacement in the direction can be reduced.

Further, the flow passage includes a valve opening flow passage to which a gas for displacing the piston in the valve opening direction is supplied, and the valve opening deceleration mechanism is a valve-opening flow passage for the gas flowing in the valve opening flow passage. It consists of a spare tank that regulates pressure. As a result, the spare tank can adjust the pressure of the gas flowing in the valve opening flow passage, so that the pressure of the gas supplied into the cylinder can be suppressed low, and the piston opens the shutoff valve. The speed of displacement in the direction can be reduced.

1 Emergency shutoff valve device 2 Shutoff valve 6 Rotating shaft (shaft)
6A output shaft (axis)
7 Actuator 8 Rotating lever 9 Cylinder 10 Piston 11 Piston rod 12 Rod guide 15A, 15B High-pressure gas supply unit (gas source)
16A 1st flow passage 16B 2nd flow passage (valve opening flow passage)
17 Bleed valve 21A, 21B Relief valve 23B Second safety valve (valve opening reduction mechanism)
31 Check valve (valve opening / deceleration mechanism)
32,61 throttle (valve opening / deceleration mechanism)
41 Adjusting valve (valve opening / deceleration mechanism)
51 Spare tank (valve opening / deceleration mechanism)

Claims (2)

A gas source that is activated by an external signal and emits gas,
A flow path through which gas from the gas source flows and
A cylinder connected to the flow path and supplied with gas from the gas source,
A piston provided in the cylinder and displaced by gas supply from the gas source,
A piston rod coupled to the piston and
It has a shaft extending in a direction intersecting with the piston rod, and the shaft is driven in the valve closing direction by displacement of the piston in one direction and in the valve opening direction by displacement of the piston in the other direction. Shutoff valve and
A relief valve provided in the flow passage that releases the gas supplied into the cylinder to the atmosphere after the piston is displaced.
In the emergency shutoff valve device equipped with
Connected to the said cylinder, e Bei pressure regulating valve for adjusting the pressure within the cylinder,
In the cylinder, the first chamber located on the other side where the piston is displaced when the shaft is driven in the valve opening direction and the piston are displaced when the shaft is driven in the valve closing direction. It is defined as a second chamber located on the one-way side.
The pressure regulating valve is provided in each of the first chamber and the second chamber, respectively.
Among the pressure regulating valves, the pressure regulating valve provided in the second chamber has a displacement speed of the piston when the shutoff valve is driven in the valve opening direction by displacement of the piston in the other direction. Constructs a valve opening deceleration mechanism to reduce
The valve opening set pressure of the pressure regulating valve constituting the valve opening deceleration mechanism is a pressure value lower than the valve opening set pressure of the pressure regulating valve provided in the first chamber. Emergency shutoff valve device. The valve opening / deceleration mechanism prevents the inside of the cylinder from becoming excessive pressure when gas is supplied from the gas generation source based on the valve opening set pressure of the pressure adjusting valve, and the said in the cylinder. The emergency shutoff valve device according to claim 1, wherein the displacement speed of the piston is reduced.

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