JP2009097540A - Emergency shut-down valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost, by reducing failure, by quickly confirming operation of a valve element with a simple structure, in a state of not hindering operation of a facility. <P>SOLUTION: A piston rod 7 connected to a piston 8 in a cylinder 6 in one end part of a body main body 5, is faced in the body main body 5. An auxiliary cylinder 11 is installed in the other end part of the body main body 5, and a stopper rod 13 of a stopper piston 12 in this auxiliary cylinder 11 is faced in the body main body 5 so as to be opposed to the piston rod 7. In a full opening state of the valve element 2, a clearance (a) is formed between the piston rod 7 and the stopper rod 13, and when confirming the operation of the valve element 2, when driving the piston 8 in the valve closing direction from a full opening state position of the valve element 2, the piston rod 7 is allowed to abut on the stopper rod 13, and the valve element 2 can be maintained in predetermined desired intermediate opening. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an emergency shut-off valve device provided in the middle of a fluid flow path or a gas pipeline in an oil refinery plant or the like, and in particular, confirms the operation of a valve element while operating the plant or the like. The present invention relates to an emergency shutoff valve device.

The emergency shut-off valve connected to the pipeline keeps the valve body fully open when equipment such as a plant is operating normally, and when an abnormality occurs in the equipment due to an earthquake, etc. Is operated so as to be fully closed to prevent accidents.
Therefore, in order to ensure the reliability of the emergency shut-off valve, it is carried out to check whether the valve body operates normally, by periodically interrupting the operation of the equipment, Inspection is also required while the equipment is in operation.

  In the conventional emergency shut-off valve, as shown in FIGS. 7 and 8, the body main body 04 facing the valve shaft 03 of the valve body 02 in the valve main body 01 composed of a ball valve connected to the pipeline W of the equipment. A cylinder 05 is provided adjacent to the right end of the cylinder, and a piston 07 connected to a piston rod 06 with rack teeth 06a is slidably provided in the cylinder 05 so that the piston rod 06 faces the body body 04. In addition, there is a single piston type torque cylinder in which the left end portion of the body main body 04 is closed with an end cap 08.

In this way, the emergency shut-off valve supplies pressure fluid from a fluid supply source (not shown) to the left cylinder chamber 05a of the piston 07 during normal operation of the equipment, and the pressure in the right cylinder chamber 05b. By discharging the fluid and driving the piston 07 in the valve opening direction to the right, the valve shaft 03 linked to the sector gear 09 meshed with the rack teeth 06a of the piston rod 06 is rotated, so that the valve body 02 It is designed to be kept fully open.
In an emergency, pressure fluid is supplied to the cylinder chamber 05b on the right side of the piston 07, the pressure fluid in the cylinder chamber 05a on the left side is discharged, and the piston 07 is driven in the valve closing direction on the left side. As a result, the valve body 02 is fully closed, and the emergency shutoff of the pipeline W in the plant equipment or the like is performed.

  However, since the emergency shut-off valve described above can select only two operations of opening (100%) and fully closing (0%) as the opening degree of the valve body 02, the valve body 02 is in operation during the operation of the equipment. It is not possible to check the operation.

  As an apparatus that can solve this problem, for example, there is an emergency shut-off valve device that can confirm an emergency shut-off operation even during operation of equipment such as a plant (see Patent Document 1).

The emergency shut-off valve device described in the above-mentioned patent document 1 actually checks a check valve or an electromagnetic switching valve that supplies pressure fluid to an emergency shut-off valve driving cylinder and confirms only their operation. It is not possible to confirm whether the body itself operates normally.
For this reason, if the inside of the valve body or valve case is rusted or corroded due to the nature of the fluid, the flow path may not be blocked in an emergency.

  Further, there is known a valve device that opens and closes the opening of the valve body in two stages of fully open, intermediate open, and fully closed (see Patent Document 2).

This two-stage on-off valve device has an opening restriction cylinder adjacent to one cylinder of a double-acting torque cylinder, and a piston rod of a stopper piston provided in the opening restriction cylinder is connected to one of the torque cylinders. By facing the cylinder and facing one of the reciprocating pistons, and restricting sliding of the reciprocating piston in the valve closing direction, the valve element is maintained at an intermediate opening in addition to the fully open and fully closed states. It has a configuration like this.
As a result, for example, in the initial refueling stage during the quantitative refueling work for rotary cars, tank cars, drums, etc., the valve body is filled with an intermediate opening, and static electricity is generated due to sudden refueling when the valve body is fully open Prevent and avoid the danger of fire.

However, the purpose of the two-stage on-off valve device described in Patent Document 2 is not only different from the purpose of the operation check of the valve body during operation of the equipment in the emergency shut-off valve device of the present invention, but also the opening degree of the double-action torque cylinder. Since it is configured with a single piston cylinder for regulation, the overall structure of the device is complicated and the cost is increased. Besides, the sliding resistance of the piston in the torque cylinder is large and the operation speed is slow. There was a problem of frequent failure.
Japanese Patent Laid-Open No. 10-61812 Japanese Utility Model Publication No. 61-19206

  In view of the above-mentioned present situation, the present invention can quickly check the operation of the valve body with a simple structure in a state that does not hinder the operation of the equipment, and can reduce failure and reduce costs. An object of the present invention is to provide an emergency shut-off valve device capable of achieving the above.

As described in each claim in “Claims”, the above-described problem is solved by the invention having the following configuration.
(1) A piston rod connected to a slidable piston is disposed at one end of the body body facing the valve stem of the valve body in a valve body connected to a pipeline or the like. In the emergency shut-off valve device composed of a single piston type torque cylinder facing the body body, normally, pressure fluid is supplied to a cylinder chamber on one side of the piston in the cylinder to open the piston in the valve opening direction. The valve body is fully opened via the valve shaft linked to the piston rod connected to the piston, and the pressure fluid is switched to the cylinder chamber on the other side of the piston in an emergency. A valve body opening / closing mechanism for supplying and driving the piston in a valve closing direction to fully close the valve body, and the other end of the body body An auxiliary cylinder located on the same straight line with respect to the cylinder is disposed and assembled, and a stopper piston connected to a stopper rod that is driven by the action of the pressure fluid is provided in the auxiliary cylinder, The stopper rod of the stopper piston faces the piston rod of the piston in the cylinder so as to face each other, and the cylinder on one side of the stopper piston in the fully opened state of the valve body A pressure fluid is supplied to the chamber and moved to the piston rod side so that a gap is formed between the piston rod and the stopper rod, and the piston in the cylinder is fully opened. When the valve is driven in the valve closing direction, the piston rod is brought into contact with the stopper rod to While maintaining the desired intermediate opening which defines order, constructed by a valve element operation confirmation mechanism to be carried out the operation confirmation of the valve body.

(2) In the above item (1), the valve body opening / closing mechanism is configured to supply the pressure fluid from the fluid supply source to the cylinder chamber on one side of the piston in the cylinder, and the cylinder chamber on the other side of the piston. By discharging the pressure fluid, the piston is driven in the valve opening direction so that the valve body is fully opened, and the first fluid operation switching valve is provided at the time of emergency shut-off. In a non-energized state, by supplying pressure fluid to the cylinder chamber on the other side of the piston and discharging the pressure fluid in the cylinder chamber on one side of the piston, the piston is moved in the valve closing direction. A first electromagnetic switching valve for emergency shut-off that is driven to switch the valve body to a fully closed state, and is provided between the first electromagnetic switching valve and the first fluid operation switching valve; 1st fluid operation cut off linked to electromagnetic switching valve When the valve body is in a non-energized state, the fully open state and the fully closed state of the valve body are allowed, and when in the energized state, the piston can be driven from the fully open state of the valve body toward the valve closing direction. In this way, the first fluid operation switching valve is switched and the second electromagnetic switching valve for valve body operation confirmation is configured.

(3) In the above item (1) or (2), the valve body operation confirmation mechanism is constituted by a second fluid operation switching valve interlocked with the first electromagnetic switching valve, and the second fluid operation switching valve is provided as an auxiliary By supplying the pressure fluid to the cylinder chamber on one side of the stopper piston in the cylinder and discharging the pressure fluid on the cylinder chamber on the other side of the stopper piston, the stopper rod is energized by the first electromagnetic switching valve. In the fully open state of the valve body in this state, the valve body is stopped at the opening restriction position of the valve body so that a gap is formed between the piston rod and the piston in the cylinder, and the second electromagnetic when the operation of the valve body is confirmed. In the energized state of the switching valve, the valve body can be maintained at a predetermined intermediate opening degree by bringing the piston rod that drives the valve body in the valve closing direction into contact with the stopper rod. The pressure fluid is supplied to the cylinder chamber on the other side of the stopper piston and the pressure in the cylinder chamber on the one side of the stopper piston in the non-energized state of the first electromagnetic switching valve at the time of emergency shutoff. By discharging the fluid, the stopper rod is controlled to be stopped at a position separated from the piston rod in the fully closed state of the valve body.

(4) In any one of the above items (1) to (3), the gap between the stopper rod and the piston rod in the fully opened state of the valve body can be set by the length of the stopper rod.

(5) In any one of the above items (1) to (4), a detecting means for detecting an intermediate opening operation of the valve body is provided on the valve shaft of the valve body.

According to the present invention, the following effects can be achieved.
According to the first aspect of the present invention, the auxiliary cylinder is disposed and assembled to the body body of the single piston type torque cylinder by the cylinder so as to be positioned on the same straight line, and the cylinder is used for the valve body opening / closing mechanism. Therefore, the opening / closing operation of the valve body can be performed quickly.
In addition, the piston rod connected to the piston in the cylinder in the valve body opening / closing mechanism and the stopper rod connected to the stopper piston in the auxiliary cylinder in the valve body operation confirmation mechanism are faced in the body body so as to face each other. At the same time, a gap is formed between the stopper rod and the piston rod in the fully opened state of the valve body, and the piston is driven in the valve closing direction from the fully opened position of the valve body when confirming the operation of the valve body. Since the valve body can be maintained at a predetermined desired intermediate opening by bringing the piston rod into contact with the stopper rod, the valve body is not less than a predetermined constant opening. The valve body is not closed, and the operation of the valve body can be quickly confirmed with a simple structure in a state where the flow path of the pipeline and the like does not interfere with the operation of the equipment. Together, it is possible to reduce the failure.
Further, since the auxiliary cylinder is assembled by removing the end cap of the conventional single piston torque cylinder, the cost can be reduced and the operation of the valve body can be confirmed at low cost.

  According to the second aspect of the present invention, the valve body opening / closing mechanism includes a first fluid operation switching valve that drives the piston in the valve opening direction of the valve body to fully open the valve body, and the first fluid operation switching. A first electromagnetic switching valve for emergency shut-off that switches the valve to the fully closed state by driving the piston in the valve closing direction in the non-energized state at the time of emergency shut-off; When the valve body is in a non-energized state via a first fluid operation switching valve provided between the electromagnetic switching valve and the first fluid operation switching valve and interlocking with the first electromagnetic switching valve, The second fluid operation switching second valve is switched to allow the closed state and to switch the first fluid operation switching valve so that the piston can be driven from the fully open state of the valve body toward the valve closing direction when energized. Because it is composed of an electromagnetic switching valve, the valve body can be opened and closed by driving a piston. Ya or can be carried out in.

  According to the third aspect of the present invention, the second fluid operation switching valve constituting the valve body operation confirmation mechanism, the stopper rod of the stopper piston in the auxiliary cylinder, the valve body fully opened in the energized state of the first electromagnetic switching valve. In the state, the valve body is stopped at the opening restriction position so that a gap is formed between the piston rod of the piston in the cylinder, and in the energized state of the second electromagnetic switching valve at the time of confirming the operation of the valve body, The piston rod that drives the valve body in the valve closing direction is brought into contact with the stopper piston, so that the valve body can be maintained at a predetermined intermediate opening degree and the first electromagnetic switching at the time of emergency shut-off. Since the stopper piston is controlled to stop at a position separated from the piston rod in the fully closed state of the valve body in the non-energized state of the valve, the valve When confirming the operation of the valve, the piston rod can be accurately stopped at the opening restriction position of the valve body, and the valve body can be maintained at an intermediate opening that does not interfere with the operation of the equipment. The body operation confirmation test can be easily performed at any time, and the valve body can be fully closed at the time of emergency shut-off.

  According to the fourth aspect of the invention, since the gap between the stopper rod and the piston rod in the fully opened state of the valve body can be set by the length of the stopper rod, the opening degree of the valve body is easily adjusted. be able to.

  According to the invention described in claim 5, since the detecting means for detecting the intermediate opening operation of the valve body is provided on the valve shaft of the valve body, it is determined whether or not the valve body operates normally. It can be easily confirmed even from a remote location far from the device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a fully closed state of the valve body of the first embodiment of the emergency shutoff valve device according to the present invention, and FIG. 2 is a fully closed valve body shown across the cylinder system. FIG. 3 is a plan view of the valve body in a fully opened state shown across the cylinder system, FIG. 4 is a schematic view of the cylinder control system in a fully opened state of the valve body, and FIG. FIG. 6 is a schematic view of the cylinder control system when the operation of the valve body is confirmed. FIG.

  As shown in FIGS. 1 and 2, the emergency shut-off valve device of the present invention includes a known valve body 1 composed of a ball valve connected in the middle of a pipeline W in a plant facility or the like, and the inside of the valve body 1. The ball-shaped valve body 2 accommodated in the cylinder is constituted by a cylinder-type valve drive control mechanism 4 that controls opening and closing via a valve shaft 3.

  In the valve drive control mechanism 4, a piston rod 7 with rack teeth 7 a facing the inside of the body body 5 is connected to a cylinder 6 disposed at the right end of the body body 5 facing the valve shaft 3 of the valve body 2. The piston 8 is slidably provided, and normally, the compressed air from the fluid supply source is supplied to the cylinder chamber 6a on the left side of the piston 8 via the port P1, and the cylinder chamber 6b on the right side of the piston 8 is supplied. The pressure air is discharged through the port P2, and the piston 8 is driven in the valve-opening direction to the right, thereby being linked to the sector gear 9 meshed with the rack teeth 7a of the piston rod 7 connected to the piston 8. As shown in FIG. 3, the valve shaft 3 of the valve body 2 to be rotated is rotated clockwise to allow the valve body 2 in the valve body 1 to be fully opened, and the valve is formed of a conventional single piston torque cylinder. Body opener With a 10.

  The end cap of the conventional single piston type torque cylinder shown in FIGS. 7 and 8 is removed from the left end of the body body 5 so that the auxiliary cylinder 11 is positioned on the same straight line as the left and right of the cylinder 8. It is arranged.

  The valve drive control mechanism 4 is provided with a stopper piston 12 driven by the action of the pressurized air in the auxiliary cylinder 11, and a stopper rod 13 connected to the stopper piston 12 is opposed to the piston rod 7 of the piston 8. As shown in the figure, while facing the inside of the body body 5, in the fully opened state of the valve body 2, pressurized air is supplied to the cylinder chamber 11 a on the left side of the stopper piston 12 through the port P 3, As shown in FIG. 3, the piston rod 7 is discharged as shown in FIG. 3 by discharging the pressurized air in the cylinder chamber 7b through the port P4 and driving the stopper rod 13 of the stopper piston 12 to the right piston rod 7 side. And a single piston type stopper mechanism in which a gap a is formed between the stopper piston 13 and the stopper piston 13. Having a valve-operated check mechanism 14 consisting of Sunda.

The gap a between the piston rod 7 and the stopper rod 13 in the fully opened state of the valve body can be set by the length L of the stopper rod 13.
Thereby, the opening degree adjustment of the valve body 2 in the valve body 1 can be easily performed.

In an emergency, the valve body opening / closing mechanism 10 switches and supplies the pressure fluid to the cylinder chamber 6b on the right side of the piston 8 via the port P2 and supplies the pressure fluid in the cylinder chamber 6a on the left side of the piston 8 to the port P1. The valve body 2 of the valve body 1 can be allowed to be fully closed by driving the piston 8 in the valve closing direction on the left side, and the pipeline W of the equipment can be shut off. It is like that.
At this time, the valve element operation confirmation mechanism 14 supplies pressurized air to the cylinder chamber 11b on the right side of the stopper piston 12 in the auxiliary cylinder 11 via the port P4, and the cylinder chamber 11a on the left side of the stopper piston 12 is supplied. Is discharged from the piston rod 7 in the valve body 2 in the fully closed state by driving the stopper rod 13 of the stopper piston 12 to the left. To stop.

  When the operation of the valve body 2 in the valve body 1 is confirmed, the valve body operation confirmation mechanism 14 drives the piston 8 from the fully open position of the valve body 2 in the valve closing direction, so that the piston rod 7 becomes the stopper rod 13. The valve body 2 is maintained at a predetermined desired intermediate opening degree by contacting.

  As shown in FIG. 4, the drive control circuit of the valve body opening / closing mechanism 10 includes a first air operation switching valve 15 and an emergency shut-off first electromagnetic switching valve 16 that switches the first air operation switching valve 15. The second electromagnetic switching valve 17 is connected between the first electromagnetic switching valve 16 and the first air operated switching valve 15 for confirming the valve element operation.

  The first air-operated switching valve 15 is placed on the left side of the piston 8 by bringing the first electromagnetic switching valve 16 into an energized state in a non-energized state of the second electromagnetic switching valve 17 during normal operation of the plant equipment. By supplying pressure air from the fluid supply source 18 to the cylinder chamber 6a through the filter regulator 19, and switching and interlocking so as to discharge the pressure air in the cylinder chamber 6b on the right side of the piston 8, the piston 8 is moved to the right. The valve body 2 of the valve main body 1 is maintained in a fully open state by being driven in the valve opening direction.

  The drive control circuit of the valve element operation confirmation mechanism 14 has a second air operation switching valve 20 connected so as to be interlocked with the first electromagnetic switching valve 16.

  As described above, when the valve body 2 in the valve body 1 is fully opened, the second air operation switching valve 20 supplies the pressure air from the fluid supply source 18 to the cylinder chamber 11a on the left side of the stopper piston 12 as a filter regulator. 19, the pressure air in the cylinder chamber 7 b on the right side of the stopper piston 12 is discharged, and the stopper rod 13 of the stopper piston 12 is driven to the side of the piston rod 7 on the right side. 13 so as to form a gap a.

Further, as shown in FIG. 5, when the first electromagnetic switching valve 16 is deenergized at the time of emergency shutoff when the second electromagnetic switching valve 17 is in a non-energized state, the first air operation switching valve 15 is in the cylinder 6. Pressure air from a fluid supply source 18 such as an air tank is supplied to the cylinder chamber 6b on the right side of the piston 8 through a filter regulator 19, and the pressure air in the cylinder chamber 6a on the left side of the piston 8 is discharged. By driving the piston rod 7 in the valve closing direction on the left side, the valve body 2 of the valve body 1 is switched so as to be fully closed.
At this time, the second air operation switching valve 20 causes the pressurized air from the fluid supply source 17 to flow into the cylinder chamber 11b on the right side of the stopper piston 12 in the auxiliary cylinder 11 due to the non-energized state of the first electromagnetic switching valve 16. While supplying through the filter regulator 19, the pressure air of the cylinder chamber 11a of the left side in the stopper piston 12 is discharged | emitted, and the stopper rod 13 of the stopper piston 12 is driven to the left, The valve body 2 in the valve main body 1 is driven. In the fully closed state, switching is performed so as to stop at a position separated from the piston rod 7.

The energization operation of the first electromagnetic switching valve 16 and the second electromagnetic switching valve 17 is performed by a logic controller 21 installed in the control room of the plant facility. The limit switch 22 attached to the is connected.
This limit switch 22 detects the rotation operation of the valve shaft 3, that is, the opening / closing operation of the valve body 2, and feeds back to the logic controller 21. To be done.
Further, after the valve element operation is confirmed, the energized state of the second electromagnetic switching valve 17 is released by this feedback signal, and the valve element 2 is returned to the fully open state at the normal time.

In the normal opening state of the valve body 2 in the valve body 1 shown in FIG. 4, when the operation confirmation of the valve body 2 is performed, the first electromagnetic switching valve 16 is energized as shown in FIG. 6. When the second electromagnetic switching valve 17 is energized, the second air operation switching valve 20 maintains the normal state, and only the first air operation switching valve 15 is switched, and the cylinder 6 constituting the valve element opening / closing mechanism 10 is switched. Pressure air from the fluid supply source 18 is supplied to the cylinder chamber 6b on the right side of the piston 8 through the filter regulator 19, and the pressure air in the cylinder chamber 6a on the left side of the piston 8 is discharged. The body 2 is driven in the valve closing direction on the left side from the fully opened position.
At this time, the piston rod 7 connected to the piston 8 is brought into contact with the stopper rod 13, and the rotation of the sector gear 9 in the counterclockwise direction is restricted according to the gap a between the two, whereby the valve The valve body 2 of the main body 1 operates so as to be able to close, for example, about 15 to 30% from the fully opened state of 100%, and is maintained at a predetermined desired intermediate opening degree.
In this case, a sector gear 9 for rotating the valve shaft 3 is engaged with the rack teeth 7a of the piston rod 7, and the load is applied to the thrust of the piston 8 under the same fluid pressure. Since the thrust is lower than the thrust of the stopper piston 12, the piston rod 7 can be reliably stopped at a desired stop position by the stopper rod 13.
Thereby, the valve body 2 of the valve body 1 is not closed beyond a predetermined opening, and the flow path of the pipeline W in the plant equipment does not hinder the operation of the equipment. Thus, the valve body operation confirmation can be quickly performed with a simple structure.

  When the original emergency shut-off signal is input to the first electromagnetic switching valve 16 during the valve body operation confirmation, the first electromagnetic switching valve 16 is turned off and the second air operation switching valve 20 is switched. As shown in FIG. 5, the stopper rod 13 of the stopper piston 12 is driven to the left to allow the piston 8 to be driven in the valve closing direction to the left, and the valve body 2 of the valve main body 1 is completely moved. The valve is closed.

  After the valve body operation is confirmed, the energized state of the second electromagnetic switching valve 17 is released by the feedback signal fed back from the limit switch 22 to the logic controller 21, and the valve body 2 is returned to the fully open state at the normal time.

It is a front view which cuts and shows the cylinder system of 1st Embodiment in the emergency shut-off valve apparatus of this invention longitudinally. Similarly, it is a top view of the valve body fully closed state shown across a cylinder system. Similarly, it is a top view of the valve body fully open state shown across a cylinder system. It is the schematic of the cylinder control system in the fully closed state of a valve body. Similarly, it is the schematic of the cylinder control system in the fully open state of a valve body. Similarly, it is the schematic of a cylinder control system at the time of operation check of a valve element. It is a front view of the valve body fully closed state which shows the cylinder system in the conventional emergency shut-off valve apparatus longitudinally. Similarly, it is a top view shown across a cylinder system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve body 2 Valve body 3 Valve shaft 4 Valve drive control mechanism 5 Body main body 6 Cylinder 6a Cylinder chamber 6b Cylinder chamber 7 Piston rod 7a Rack tooth 8 Piston 9 Sector gear 10 Valve body opening / closing mechanism 11 Auxiliary cylinder 11a Cylinder chamber 11b Cylinder chamber 12 Stopper piston 13 Stopper rod 14 Valve element operation confirmation mechanism 15 First air operation switching valve 16 First electromagnetic switching valve 17 Second electromagnetic switching valve 18 Fluid supply source 19 Filter regulator 20 Second air operation switching valve 21 Logic controller 22 Limit Switch 01 Valve body 02 Valve body 03 Valve shaft 04 Body body 05 Cylinder 05a Cylinder chamber 05b Cylinder chamber 06 Piston rod 06a Rack tooth 07 Piston 08 End cap 09 Sector gear a Clearance L Stopper rod length P1 to P4 Port W pipeline

Claims (5)

A cylinder is arranged at one end of the body body facing the valve shaft of the valve body in a valve body connected to a pipeline or the like, and a piston rod connected to a slidable piston in the cylinder is connected to the body body. In the emergency shut-off valve device consisting of a single piston type torque cylinder facing inside,
Normally, pressure fluid is supplied to the cylinder chamber on one side of the piston in the cylinder, and the piston is driven in the valve opening direction, so that the piston is connected to the piston rod connected to the piston. The valve body is fully opened and, in an emergency, the valve body is fully closed by switching and supplying pressure fluid to the cylinder chamber on the other side of the piston and driving the piston in the valve closing direction. A valve body opening and closing mechanism to be in a state;
An auxiliary cylinder located on the same straight line with respect to the cylinder is disposed and assembled to the other end of the body body, and a stopper rod that is driven by the action of the pressure fluid is connected to the auxiliary cylinder. A stopper piston is provided, and the stopper rod of the stopper piston faces the piston rod of the piston in the cylinder so as to face each other, and in the fully opened state of the valve body, the stopper piston A pressure fluid is supplied to the cylinder chamber on one side of the cylinder and moved to the piston rod side so that a gap is formed between the piston rod and the stopper rod, and the piston in the cylinder is When the valve body is driven in the valve closing direction from the fully open position, the piston rod is used as a stopper rod. An emergency shut-off valve device comprising: a valve body operation confirmation mechanism that allows the operation of the valve body to be confirmed while maintaining the valve body at a predetermined desired intermediate opening degree. . The valve body opening / closing mechanism supplies the pressure fluid from the fluid supply source to the cylinder chamber on one side of the piston in the cylinder, and discharges the pressure fluid from the cylinder chamber on the other side of the piston. A first fluid operated switching valve that drives the valve body in the valve opening direction to bring the valve body into a fully open state;
In the non-energized state at the time of emergency shut-off, the first fluid operation switching valve supplies pressure fluid to the cylinder chamber on the other side of the piston and discharges pressure fluid in the cylinder chamber on one side of the piston. Thus, the first electromagnetic switching valve for emergency shut-off for switching the valve body to be in a fully closed state by driving the piston in the valve closing direction;
When the valve body is in a non-energized state via a first fluid operation switching valve provided between the first electromagnetic switching valve and the first fluid operation switching valve and interlocking with the first electromagnetic switching valve, Valve body operation that allows a fully open state and a fully closed state, and switches the first fluid operation switching valve so that the piston can be driven from the fully open state of the valve body toward the valve closing direction when energized. 2. The emergency shut-off valve device according to claim 1, comprising a second electromagnetic switching valve for confirmation.   The valve body operation confirmation mechanism is constituted by a second fluid operation switching valve interlocked with the first electromagnetic switching valve, and this second fluid operation switching valve is placed in the cylinder chamber on one side of the stopper piston in the auxiliary cylinder. And the pressure fluid in the cylinder chamber on the other side of the stopper piston is discharged, so that the stopper rod is moved in the fully open state of the valve body in the energized state of the first electromagnetic switching valve. The valve body is stopped at the opening restriction position so that a gap is formed between the piston rod and the valve body is driven in the valve closing direction when the second electromagnetic switching valve is energized at the time of confirming the operation of the valve body. The piston rod to be brought into contact with the stopper rod makes it possible to maintain the valve body at a predetermined intermediate opening degree that is set in advance, and the first electromagnetic at the time of emergency shut-off By supplying pressure fluid to the cylinder chamber on the other side of the stopper piston and discharging the pressure fluid in the cylinder chamber on one side of the stopper piston in the non-energized state of the valve, the stopper rod The emergency shut-off valve device according to claim 1 or 2, wherein switching control is performed to stop the body at a position separated from the piston rod in a fully closed state.   The emergency shut-off valve device according to any one of claims 1 to 3, wherein a gap between the stopper rod and the piston rod in the fully opened state of the valve body can be set by a length of the stopper rod.   The emergency shut-off valve device according to any one of claims 1 to 4, wherein a detection means for detecting an intermediate opening operation of the valve body is provided on the valve shaft of the valve body.

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