JP5053027B2 - Emergency shut-off valve device - Google Patents

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. 8 and 9, 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 pair of left and right cylinders 05, 06 are provided symmetrically adjacent to each other so as to be located on the same straight line, and left and right 1 connected to each other in the cylinders 05, 06 by a piston rod 07. There is a double-acting torque cylinder in which a pair of pistons 08 and 09 are slidably provided.

In this way, the emergency shut-off valve supplies pressure fluid from a fluid supply source (not shown) to the left cylinder chambers 05a and 06a of the left and right pistons 08 and 09 during normal operation of the equipment. By discharging the pressure fluid in the cylinder chambers 05b and 06b and driving the left and right pistons 08 and 09 in the valve opening direction to the right, the valve shaft is connected via the swing arm 010 linked to the piston rod 07. 03 is rotated so that the valve body 02 is maintained in a fully open state.
In an emergency, pressure fluid is supplied to the right cylinder chambers 05b and 06b in the left and right pistons 08 and 09, and the pressure fluid in the left cylinder chambers 05a and 06a is discharged, and the left and right pistons 08, 09b are discharged. By driving 09 in the valve closing direction on the left side, 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) The first cylinder and the second cylinder are arranged on the same straight line at both ends of the body body facing the valve shaft of the valve body in the valve body connected to the pipeline. In an emergency shut-off valve device comprising a double-acting cylinder, normally, pressure fluid from a fluid supply source is supplied to a cylinder chamber on one side of a piston that is slidable in the first cylinder to open the piston. By driving in the valve direction, the valve body is fully opened via the valve shaft linked to the piston rod connected to the piston, and in an emergency, the pressure is applied to the cylinder chamber on the other side of the piston. By switching and supplying fluid and driving the piston in the valve closing direction, a valve body opening / closing mechanism for fully closing the valve body, and the action of the pressure fluid in the second cylinder A stopper piston for driving is provided, and the piston rod of the piston in the first cylinder faces the second cylinder so as to face the stopper piston, and the stopper piston is opened in the fully opened state of the valve body. Supplying the pressure fluid to the cylinder chamber on one side of the cylinder and driving the stopper piston to the piston rod side so that a gap is formed between the piston rod and the stopper piston; and When the operation of the valve body is confirmed, when the piston in the first cylinder is driven in the valve closing direction from the fully opened position of the valve body, the piston rod is brought into contact with the stopper piston, and the valve body is moved. And a valve element operation confirmation mechanism capable of maintaining a predetermined desired intermediate opening degree.

(2) In the above item (1), 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 first cylinder, and the cylinder on the other side of the piston. By discharging the pressure fluid in the chamber, 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 urgently shut off. In a non-energized state, the pressure fluid is supplied to the cylinder chamber on the other side of the piston and the pressure fluid in the cylinder chamber on one side of the piston is discharged, thereby closing the piston of the valve body. A first electromagnetic switching valve for emergency shut-off that is driven in a direction to switch the valve body to a fully closed state, and is provided between the first electromagnetic switching valve and the first fluid operated switching valve; First fluid operation linked to the first electromagnetic switching valve Via the switching valve, when the valve body is in a non-energized state, the valve body is allowed to be fully open and fully closed, and when in the energized state, the piston is driven from the valve body fully open to the valve closing direction. As can be seen, it is constituted by a second electromagnetic switching valve for switching the first fluid operation switching valve for confirming valve body operation.

(3) In the above item (1) or (2), the valve body operation confirmation mechanism is configured by a second fluid operation switching valve that is linked to the first electromagnetic switching valve, and the second fluid operation switching valve is By supplying the pressure fluid to the cylinder chamber on one side of the stopper piston in the two cylinders and discharging the pressure fluid on the cylinder chamber on the other side of the stopper piston, the stopper piston is moved to the first electromagnetic switching valve. In the fully open state of the valve body in the energized state, the valve body is stopped at the opening restriction position so that a gap is formed between the piston rod and the piston in the first cylinder. In the energized state of the second electromagnetic switching valve, the piston rod that drives the valve body in the valve closing direction is brought into contact with the stopper piston to maintain the valve body at a predetermined intermediate opening degree. The pressure fluid is supplied to the cylinder chamber on the other side of the stopper piston and the cylinder chamber on one side of the stopper piston is supplied in a non-energized state of the first electromagnetic switching valve at the time of emergency shutoff. When the pressure fluid is discharged, the stopper piston 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), a manual operation for confirming valve body operation is performed at the valve installation site between the first electromagnetic switching valve and the second electromagnetic switching valve in the valve body opening / closing mechanism. Provide a manual switching valve to enable.

(5) In any one of the above items (1) to (4), the stopper piston is formed in a bottomed cylindrical body with the piston rod side open, and the length of the peripheral wall on the piston rod side in the bottomed cylindrical body Thus, the stroke width of the stopper piston is regulated so that the gap between the stopper piston and the piston rod can be set.

(6) In any one of the above items (1) to (5), detection means for detecting an intermediate opening degree 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 double-acting cylinder in which the first cylinder and the second cylinder are disposed on the same straight line at both ends of the body main body is used to open and close the valve body. The operation can be performed promptly.
In addition, the piston rod connected to the piston in the first cylinder in the valve element opening / closing mechanism faces the stopper cylinder in the second cylinder in the valve element operation confirmation mechanism so as to face the second cylinder, and the valve element In the fully opened state, a gap is formed between the piston rod and the stopper piston, and when the operation of the valve body is confirmed, the piston of the first cylinder is driven in the valve closing direction from the fully opened position of the valve body. Since the valve body can be maintained at a predetermined desired intermediate opening degree by bringing the piston rod into contact with the stopper piston, the valve body is not less than a predetermined constant opening degree. The valve body is not closed, and the flow of the pipeline and the like can be quickly checked with a simple structure in a state that does not hinder the operation of the equipment, and there is no trouble. It can be without.
Furthermore, by simply changing the cost of the stopper piston and piston rod, it is possible to use a double-acting cylinder similar in appearance to the conventional type, so that the cost can be reduced and the operation of the valve element can be confirmed at low cost. It can be carried out.

  According to the second aspect of the present invention, the valve body opening / closing mechanism is configured to drive the piston in the first cylinder in the valve opening direction of the valve body so that the valve body is fully opened; A first electromagnetic switching valve for emergency shut-off that switches the valve body to a fully closed state by driving the piston in the valve closing direction in a non-energized state at the time of emergency shut-off. And a valve element when 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. The first fluid operation switching valve is switched so that the piston can be driven from the fully open state of the valve body toward the valve closing direction when the fully open state and the fully closed state of the valve body are energized. Because it is configured with a second electromagnetic switching valve for confirmation, the piston is driven. That the opening and closing of the valve element can be performed quickly.

  According to the third aspect of the present invention, the second fluid operation switching valve constituting the valve body operation confirmation mechanism, the stopper piston in the second cylinder, and the valve body in the fully open state when the first electromagnetic switching valve is energized. In the energized state of the second electromagnetic switching valve at the time of confirming the operation of the valve body, the valve body is stopped at the opening restriction position so that a gap is formed between the piston rod and the piston rod in the first cylinder. 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. When the valve is not energized, the stopper piston is switched to stop at a position separated from the piston rod when the valve body is fully closed. In addition, the piston rod can be accurately stopped at the valve element opening restriction position, and the valve element can be maintained at an intermediate opening that does not interfere with the operation of the equipment. The confirmation test can be easily performed at any time, and the valve element can be fully closed at the time of emergency shut-off.

  According to the fourth aspect of the present invention, the manual switching valve that enables manual operation of the valve body operation confirmation at the valve installation site is provided between the first electromagnetic switching valve and the second electromagnetic switching valve in the valve body opening / closing mechanism. Since it is provided, the operation confirmation of the valve body can be performed both online from a position away from the emergency shutoff valve device and manually operated at the installation site.

  According to the invention of claim 5, the stopper piston is formed in the bottomed cylindrical body with the piston rod side opened, and the stroke of the stopper piston is determined by the length of the peripheral wall on the piston rod side in the bottomed cylindrical body. Since the width is regulated and the gap between the stopper piston and the piston rod can be set, the opening degree of the valve body can be easily adjusted.

  According to the invention described in claim 6, 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. 6 is a schematic view of the cylinder control system when the body is fully closed.

  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.

  The valve drive control mechanism 4 is bilaterally symmetric so that the first cylinder 6 and the second cylinder 7 are positioned on the same straight line at the left and right ends of the body body 5 facing the valve shaft 3 of the valve body 2. In addition, a double-acting cylinder disposed in a normal manner is used, and in a normal state, pressure air from a fluid supply source is connected to a cylinder chamber 6a on the left side of the piston 8 slidable in the first cylinder 6 via a port P1. The piston rod 9 connected to the piston 8 is discharged by discharging the pressurized air in the cylinder chamber 6b on the right side of the piston 8 through the port P2 and driving the piston 8 in the valve opening direction on the right side. In addition, the valve body 3 of the valve body 2 linked via the swing arm 10 is rotated counterclockwise to allow the valve body 2 in the valve body 1 to be fully opened as shown in FIG. Valve body consisting of a single piston type torque cylinder With a closing mechanism 11.

  Further, the valve drive control mechanism 4 is provided with a stopper piston 12 which is driven in common in the second cylinder 7 under the same pressure as the pressurized air, and the piston can be opposed to the stopper piston 12. 8, the piston rod 9 faces the second cylinder 7, and in the fully opened state of the valve body 2, pressurized air is supplied to the cylinder chamber 7 a on the left side of the stopper piston 12 via the port P 3, The pressure air in the cylinder chamber 7b on the right side of the piston 12 is discharged through the port P4, and the stopper piston 12 is driven to the side of the piston rod 9 on the right side, as shown in FIG. And a valve body operation confirmation mechanism 13 composed of a single piston type stopper cylinder so that a gap a is formed between the valve piston and the stopper piston 12. To.

The stopper piston 12 is formed in a bottomed cylindrical body with the piston rod 9 side open, and the stroke width of the stopper piston 12 is regulated by the length L of the peripheral wall 12a on the piston rod 9 side in the bottomed cylindrical body. The gap a between the stopper piston 12 and the piston rod 9 can be set.
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 11 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 body operation confirmation mechanism 13 supplies pressurized air to the cylinder chamber 7b on the right side of the stopper piston 12 in the second cylinder 7 via the port P4, and the cylinder chamber on the left side of the stopper piston 12 is supplied. The pressure air of 7a is discharged through the port P3, and the stopper piston 12 is driven to the left, so that the valve body 2 in the valve body 1 is stopped at a position separated from the piston rod 9 in the fully closed state. It is like that.

  When the operation of the valve body 2 in the valve body 1 is confirmed, the valve body operation confirmation mechanism 13 drives the piston 8 in the valve closing direction from the fully open position of the valve body 2 to move the piston rod 9 to the stopper piston 12. 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 element opening / closing mechanism 11 includes a first air operation switching valve 14, an emergency cutoff first electromagnetic switching valve 15 that switches the first air operation switching valve 14, and The second electromagnetic switching valve 16 for confirming the valve element operation connected between the first electromagnetic switching valve 15 and the first air operated switching valve 14 is connected.

  The first air-operated switching valve 14 is placed on the left side of the piston 8 by energizing the first electromagnetic switching valve 15 in a non-energized state of the second electromagnetic switching valve 16 during normal operation during operation of the plant equipment. Pressure air from the fluid supply source 17 is supplied to the cylinder chamber 6a through the filter regulator 18, and the piston 8 is moved to the right by switching and interlocking so that the pressure air in the cylinder chamber 6b on the right side of the piston 8 is discharged. 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 13 has a second air operation switching valve 19 connected so as to be interlocked with the first electromagnetic switching valve 15.

  The second air operation switching valve 19 supplies the pressure air from the fluid supply source 17 through the filter regulator 18 to the cylinder chamber 7 a on the left side of the stopper piston 12 in the fully opened state of the valve body 2 in the valve body 1 described above. Then, the pressure air in the cylinder chamber 7b on the right side of the stopper piston 12 is discharged, and the stopper piston 12 is driven to the side of the piston rod 9 on the right side, whereby a gap a is formed between the piston rod 9 and the stopper piston 12. Has been switched to form.

Further, as shown in FIG. 5, when the first electromagnetic switching valve 15 is brought into a non-energized state when the second electromagnetic switching valve 16 is in a non-energized state and the first electromagnetic switching valve 15 is de-energized, as shown in FIG. Pressure air from a fluid supply source 17 such as an air tank is supplied to the cylinder chamber 6b on the right side of the piston 8 in the filter 6 through the filter regulator 18, and the pressure air in the cylinder chamber 6a on the left side of the piston 8 is discharged. By driving the piston 8 in the valve closing direction on the left, 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 19 supplies the pressure air from the fluid supply source 17 to the cylinder chamber 7b on the right side of the stopper piston 12 in the second cylinder 7 by the non-energized state of the first electromagnetic switching valve 15. The valve body 2 in the valve body 1 is fully closed by supplying the air through the filter regulator 18 and discharging the pressure air in the left cylinder chamber 7a of the stopper piston 12 to drive the stopper piston 12 to the left. Are switched to stop at a position separated from the piston rod 9.

The energization operation of the first electromagnetic switching valve 15 and the second electromagnetic switching valve 16 is performed by a logic controller 20 installed in the control room of the plant facility. The limit switch 21 attached to the is connected.
This limit switch 21 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 20, and the operation confirmation of the valve body 2 in the valve body 1 to be described later is performed remotely. To be done.
In addition, after confirming the valve element operation, the energized state of the second electromagnetic switching valve 16 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 open 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 15 is energized as shown in FIG. 6. When the second electromagnetic switching valve 16 is energized, the second air operation switching valve 19 maintains the normal state, and only the first air operation switching valve 14 is switched, and the first cylinder constituting the valve body opening / closing mechanism 11 The pressure air from the fluid supply source 17 is supplied to the cylinder chamber 6b on the right side of the piston 8 in the filter 6 through the filter regulator 18, and the pressure air in the cylinder chamber 6a on the left side of the piston 8 is discharged. The valve body 2 is driven in the valve closing direction on the left side from the fully opened position.
At this time, the piston rod 9 connected to the piston 8 is brought into contact with the stopper piston 12, and the rotation of the swing arm 10 in the clockwise 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 swing arm 10 that rotates the valve shaft 3 is linked to the piston rod 9, and the load of the piston 8 is greater than the thrust of the stopper piston 12 under the same fluid pressure. Therefore, the piston rod 9 can be reliably stopped at a desired stop position by the stopper piston 12.
Thereby, the valve body 2 of the valve body 1 is not closed beyond a predetermined opening degree, and the flow path of the pipeline W in the plant equipment does not interfere with 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 15 during the valve body operation confirmation, the first electromagnetic switching valve 15 is deenergized and the second air operation switching valve 19 is switched. As shown in FIG. 5, the stopper piston 12 is driven leftward to allow the piston 8 to be driven in the valve closing direction to the left, and the valve body 2 of the valve body 1 is fully closed.

  Further, after the valve body operation is confirmed, the energized state of the second electromagnetic switching valve 16 is released by the feedback signal fed back from the limit switch 21 to the logic controller 20, and the valve body 2 is returned to the fully opened state at the normal time.

FIG. 7 is a schematic view of the cylinder control system in a fully opened state of the valve body in the second embodiment of the present invention.
In the following description, the description of the same parts as those in the first embodiment is omitted.

In the emergency shut-off valve device of the present embodiment, the first electromagnetic switching valve 24 for emergency shut-off constituting the drive control circuit in the valve body opening / closing mechanism 23 of the valve body drive control mechanism 22 and the second electromagnetic for confirming the valve body operation. A manual switching valve 26 is provided between the switching valve 25 and the manual switching valve 26 for enabling manual operation for confirming the operation of the valve body at the valve installation site, and the first pneumatic switching valve 27 is set by pushing the manual switching valve 26. The valve body operation is confirmed by switching.
Thereby, the operation check of the valve body in the valve body can be performed both by remote operation from a position away from the emergency shutoff valve device and by manual operation at the installation site.

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 open state of a valve body. Similarly, it is the schematic of the cylinder control system in the fully closed 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 the schematic of the cylinder control system of the valve body full open state in 2nd Embodiment of this invention. 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

1 Valve body 2 Valve body 3 Valve shaft 4 Valve drive control mechanism 5 Body body 6 First cylinder 6a Cylinder chamber 6b Cylinder chamber 7 Second cylinder 7a Cylinder chamber 7b Cylinder chamber 8 Piston 9 Piston rod 10 Swing arm 11 Valve body opening / closing Mechanism 12 Stopper piston 12a Perimeter wall 13 Valve element operation confirmation mechanism 14 First air operation switching valve 15 First electromagnetic switching valve 16 Second electromagnetic switching valve 17 Fluid supply source 18 Filter regulator 19 Second air operation switching valve 20 Logic controller 21 Limit Switch 22 Valve drive control mechanism 23 Valve body opening / closing mechanism 24 First electromagnetic switching valve 25 Second electromagnetic switching valve 26 Manual switching valve 27 First air operation switching valve 01 Valve body 02 Valve body 03 Valve shaft 04 Body body 05 Cylinder 05a Cylinder Chamber 05b Cylinder chamber 06 Cylinder 06a Cylinder chamber 06b Chamber 07 piston rod 08 piston 09 piston 010 swinging arm a gap L the length of the peripheral wall of the stopper piston P1~P4 port W pipeline

Claims (6)

Double acting in which the first cylinder and the second cylinder are arranged on the same straight line at both ends of the body body facing the valve shaft of the valve body in the valve body connected to the pipeline. In an emergency shut-off valve device consisting of a cylinder,
Normally, the pressure fluid from the fluid supply source is supplied to the cylinder chamber on one side of the piston that is slidable in the first cylinder, and the piston is driven in the valve opening direction to be connected to the piston. Through the valve shaft linked to the piston rod, the valve body is fully opened, and in an emergency, the pressure fluid is switched and supplied to the cylinder chamber on the other side of the piston to close the piston in the valve closing direction. A valve body opening / closing mechanism for fully closing the valve body by driving
A stopper piston that is driven by the action of the pressure fluid is provided in the second cylinder, and the piston rod of the piston in the first cylinder faces the second cylinder so as to face the stopper piston. In addition, in the fully opened state of the valve body, the pressure fluid is supplied to a cylinder chamber on one side of the stopper piston, and the stopper piston is driven to the piston rod side, whereby the piston rod and the stopper piston When the piston is driven in the valve closing direction from the fully opened position of the valve body when the operation of the valve body is confirmed and the piston in the first cylinder is driven in the valve closing direction, A valve element operation confirmation mechanism that can maintain the valve element at a predetermined intermediate opening degree that is in contact with the stopper piston. Emergency shutoff valve apparatus characterized by being configured by. 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 first cylinder, and discharges the pressure fluid in the cylinder chamber on the other side of the piston, A first fluid operation switching valve that drives the piston 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 that is linked to the first electromagnetic switching valve, and this second fluid operation switching valve is pressurized to the cylinder chamber on one side of the stopper piston in the second cylinder. By supplying the fluid and discharging the pressure fluid from the cylinder chamber on the other side of the stopper piston, the stopper piston is moved into the first cylinder in the fully opened state of the valve body when the first electromagnetic switching valve is energized. In the energized state of the second electromagnetic switching valve at the time of confirming the operation of the valve element, the valve element is closed so that a gap is formed between the piston rod and the piston rod The piston rod that is driven in the direction is brought into contact with the stopper piston, so that the valve body can be maintained at a predetermined intermediate opening degree that is set in advance and at the time of emergency shut-off. 1 In a non-energized state of the electromagnetic switching valve, by supplying pressure fluid to the cylinder chamber on the other side of the stopper piston and discharging pressure fluid in the cylinder chamber on one side of the stopper piston, The emergency shutoff valve device according to claim 1 or 2, wherein the valve is controlled to be stopped at a position separated from the piston rod in a fully closed state of the valve body.   The manual switching valve which enables manual operation of the valve body operation confirmation at the valve installation site is provided between the first electromagnetic switching valve and the second electromagnetic switching valve in the valve body opening / closing mechanism. The emergency shut-off valve device described in 1.   The stopper piston is formed in a bottomed cylindrical body with the piston rod side open, and the stroke width of the stopper piston is regulated by the length of the peripheral wall on the piston rod side in this cylindrical body. The emergency shut-off valve device according to any one of claims 1 to 4, wherein a gap can be set. The emergency shut-off valve device according to any one of claims 1 to 5, wherein the body main body is provided with detection means for detecting an intermediate opening degree operation of the valve body.

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