JP2009243499A - Emergency shut-down valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quickly check the operation of a valve element by a simple structure, and to reduce failures and suppress cost without obstructing the operation of facilities. <P>SOLUTION: First and second pistons 8, 9 connected by a piston rod 10 are provided in first and second cylinders 6, 7. The second piston 9 comprises a stopper piston 11 formed of an annular body, and a valve opening regulation piston 13 internally fitted in an annular groove 12 slidably in an axial direction. A gap "a" is formed between one inner wall 12a regulating groove width of the annular groove 12 and the valve opening regulation piston 13 in a fully-opened state of the valve element 2. In the operation check in the fully-opened state of the valve element 2, a drive range of the valve opening regulation piston 13 when the first piston 8 is driven in the open direction from a position, a valve element 2 in the fully-opened state is regulated by the width of the gap "a" in the axial direction, the valve element 2 is maintained in a predetermined desired intermediate opening. <P>COPYRIGHT: (C)2010,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.
For this reason, in order to ensure the reliability of the emergency shut-off valve, confirmation of whether or not the valve body operates normally is performed by periodically interrupting the operation of the equipment.

  However, in order to further improve the reliability, the opening of the emergency shut-off valve does not interfere with the operation of the equipment without completely closing the emergency shut-off valve even during operation of the equipment. That is, it is desired to perform an operation confirmation test, a so-called partial stroke test, by closing the valve from about 100% to about 15 to 30%.

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. For example, the first cylinder 05 is disposed on the right side, and the second cylinder 06 having a cylinder diameter substantially the same as that of the first cylinder 05 is disposed on the left side. The first and second pistons 08, 09 are symmetrically arranged adjacent to each other so as to be located on the same straight line in the axial direction and are connected to the first and second cylinders 05, 06 by the piston rod 07. Some have a structure composed of a double-acting torque cylinder provided slidably.
A swing arm 011 is linked to the piston rod 07 via a linkage pin 010, and the valve body 02 can be opened and closed by linking the valve shaft 03 to the swing arm 011. Yes.

As described above, 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 first and second pistons 08 and 09 during normal operation due to the operation of the equipment. At the same time, the pressure fluid in the cylinder chambers 05b and 06b on the right side is discharged, and the first and second pistons 08 and 09 are driven in the valve opening direction on the right side, whereby the piston rod 07 is connected to the piston pin 07 via the linkage pin 010. The linked swinging arm 011 is driven, and the swinging of the swinging arm 011 rotates the valve shaft 03 so that the valve body 02 is maintained in the fully open state.
In an emergency such as when an abnormality occurs in the operating equipment, pressure fluid is supplied to the right cylinder chambers 05b and 06b of the first and second pistons 08 and 09, and the left cylinder By discharging the pressure fluid in the chambers 05a and 06a and driving the first and second pistons 08 and 09 in the valve closing direction to the left, the valve body 02 is fully closed, and the pipeline in the plant facility or the like An emergency shutdown of W 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 Patent Document 1 confirms only the operation of a check valve or an electromagnetic switching valve that supplies pressure fluid to the emergency shut-off valve driving cylinder, It cannot be confirmed whether or not the valve body 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, Since the restriction is provided with a single piston cylinder for restriction, the structure of the entire apparatus becomes complicated and the cost increases.
In addition, the sliding resistance of the piston in the torque cylinder is large, and there is a problem that not only the operation speed is slow, but also frequent failure tends to occur.
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 the respective claims in “Claims”, the above-mentioned problems are solved by the invention having the following configuration.

(1) The first cylinder and the second cylinder are positioned on the same straight line in the axial direction at both ends of the body body facing the valve shaft of the valve body in the valve body connected to the pipeline. In the first and second cylinders, a first piston and a second piston connected to both ends of a piston rod linked to the valve shaft are slidable in the axial direction, respectively. Sometimes, pressure fluid from a fluid supply source is supplied to the cylinder chambers on one side of the first and second pistons that are slidable in the first and second cylinders, and the first and second pistons are opened. By driving in the direction, the valve element is fully opened via the valve shaft linked to the piston rod, and in the event of an emergency, the pressure fluid is switched and supplied to the cylinder chambers on the other side of the first and second pistons. do it, In an emergency shut-off valve device composed of a double-acting cylinder that fully closes the valve body by driving the first and second pistons in the valve closing direction, the second piston is moved axially into the second cylinder. A stopper piston provided slidably and having an annular groove formed on the inner peripheral surface of the annular body, and provided in the annular groove of the stopper piston so as to be slidable in the axial direction, and connected to the first piston at one end. And configured with a valve opening restriction piston connected to the other end of the piston rod,
When the valve element is fully opened, the valve opening restricting piston of the second piston is slidably brought into contact with the other inner wall from one inner wall that restricts the groove width of the annular groove in the stopper piston. Forming a gap between the one inner wall of the groove and the valve opening restriction piston; and
When confirming the operation of the valve body, in a fully open state of the valve body, by switching the pressure fluid in the cylinder chamber on one side of the first piston so that the pressure fluid can be supplied to the cylinder chamber on the other side, By regulating the drive range of the valve opening restriction piston when the first piston is driven in the valve closing direction from the fully opened position of the valve body, the valve body is determined in advance by regulating the axial width of the gap. The desired intermediate opening can be maintained.

(2) In the above item (2), the pressure fluid from the fluid supply source is respectively supplied to the cylinder chambers on one side of the first and second pistons in the first and second cylinders, and the first and second A first fluid operated switching valve that drives the first and second pistons in the valve opening direction by discharging the pressure fluid in the cylinder chamber on the other side of the piston, thereby bringing 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 chambers on the other side of the first and second pistons, and on one side of the first and second pistons. A first electromagnetic switching valve for emergency shut-off that switches the valve body to the fully closed state by driving the first and second pistons in the valve closing direction by discharging the pressure fluid in the cylinder chamber; And provided between the first electromagnetic switching valve and the first fluid operated switching valve, and When the valve body is in a non-energized state via the first fluid-operated switching valve that is linked to one electromagnetic switching valve, the valve element is allowed to be fully open and fully closed, and when in the energized state, the stopper piston of the second piston And the first fluid operation switching valve is switched so that the valve opening restriction pistons of the first piston and the second piston can be driven from the fully open state toward the valve closing direction. A valve element opening / closing mechanism is constituted by the second electromagnetic switching valve for checking the valve element operation.

(3) In the above item (1) or (2), a valve body operation confirmation mechanism is constituted by the second fluid operation switching valve interlocked with the first electromagnetic switching valve, and the second fluid operation switching valve is connected to the second cylinder. By supplying the pressure fluid to the cylinder chamber on one side of the second piston and discharging the pressure fluid on the cylinder chamber on the other side of the second piston, the second piston is connected to the first electromagnetic switching valve. In the energized state, the valve body is stopped at the fully open position, and in the energized state of the second electromagnetic switching valve when the operation of the valve body is confirmed, the first air operated valve is switched and the second piston that drives in the valve closing direction of the valve body The valve opening degree regulating piston is brought into contact with one inner wall of the annular groove in the stopper piston of the second piston that maintains the stationary state, so that the valve body can be maintained at a predetermined desired intermediate opening degree. Together with Supplying the pressure fluid to the cylinder chamber on the other side of the second piston and discharging the pressure fluid in the cylinder chamber on one side of the second piston in the non-energized state of the first electromagnetic switching valve at the time of shutoff Thus, the second piston can be controlled so as to be stopped at the fully closed position 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), 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 second piston is provided in the second cylinder so as to be slidable in the axial direction, and the annular piston is formed on the inner peripheral surface of the annular body. A valve opening restriction piston connected to the other end of the piston rod, which is slidable in the axial direction in the annular groove of the piston and connected to the first piston at one end, and when the valve element is fully opened, The one inner wall of the annular groove is configured such that the valve opening restricting piston of the second piston can slide and come into contact with the other inner wall from one inner wall that restricts the groove width of the annular groove in the stopper piston. When the valve element is confirmed to be open, the pressure fluid in the cylinder chamber on one side of the first piston is discharged when the valve element is confirmed to be open. Direction By switching so that the pressure fluid can be supplied to the cylinder chamber, the driving range of the valve opening restriction piston when the first piston is driven in the valve closing direction from the fully opened position of the valve body is changed to the gap. Since the valve body can be maintained at a predetermined desired intermediate opening degree by regulating by the width in the axial direction, the valve body is not closed beyond a predetermined opening degree. In addition, the operation of the valve body can be quickly confirmed with a simple structure in a state where the flow path of the pipeline or the like does not hinder the operation of the facility, and the failure can be reduced.
Furthermore, since the appearance of the double-acting torque cylinder similar to that of the conventional type can be used simply by replacing the configuration of the second piston with the stopper piston and the valve opening restriction piston, the cost can be reduced. In addition, the operation of the valve body can be confirmed at a low cost.

  According to the second aspect of the present invention, the pressure fluid from the fluid supply source is respectively supplied to the cylinder chambers on one side of the first and second pistons in the first and second cylinders, and the first and second cylinders are provided. A first fluid operated switching valve that drives the first and second pistons in the valve opening direction by discharging the pressure fluid in the cylinder chamber on the other side of the piston, thereby bringing 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 chambers on the other side of the first and second pistons, and on one side of the first and second pistons. A first electromagnetic switching valve for emergency shut-off that switches the valve body to the fully closed state by driving the first and second pistons in the valve closing direction by discharging the pressure fluid in the cylinder chamber; , Provided between the first electromagnetic switching valve and the first fluid operated switching valve, and When the valve body is in a non-energized state, the valve body is allowed to be fully open and fully closed via the first fluid operated switching valve linked to the electromagnetic switch valve. A valve that switches the first fluid operation switching valve so that the valve opening restriction pistons of the first piston and the second piston can be driven from the fully open state toward the valve closing direction while maintaining the stationary state. Since the valve body opening / closing mechanism is constituted by the second electromagnetic switching valve for body operation confirmation, the valve body can be quickly opened and closed by driving the first and second pistons.

  According to the third aspect of the present invention, the valve body operation confirmation mechanism is configured by the second fluid operation switching valve interlocked with the first electromagnetic switching valve, and the second fluid operation switching valve is the second piston in the second cylinder. By supplying the pressure fluid to the cylinder chamber on one side of the cylinder and discharging the pressure fluid in the cylinder chamber on the other side of the second piston, the valve body in the energized state of the first electromagnetic switching valve In the energized state of the second electromagnetic switching valve when the operation of the valve body is confirmed, the first air operation valve is switched and the valve opening restriction piston of the second piston that drives in the valve closing direction of the valve body Is kept in contact with one inner wall of the annular groove of the stopper piston of the second piston that maintains the stationary state so that the valve body can be maintained at a predetermined intermediate opening degree, and at the time of emergency shut-off In 1 In the non-energized state of the electromagnetic switching valve, the pressure fluid is supplied to the cylinder chamber on the other side of the second piston, and the pressure fluid in the cylinder chamber on the one side of the second piston is discharged. Since switching control is possible so that the piston is stopped at the fully closed position of the valve body, the piston rod can be accurately stopped at the opening restriction position of the valve body when the operation of the valve body is confirmed. Can be maintained at an intermediate opening that does not hinder the operation of the equipment, the valve body operation check test can be easily performed at any time, and the valve body can be fully closed during an emergency shutdown. It can be done promptly.

  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 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, the present invention will be described based on the drawings.
FIG. 1 is a front view of a fully closed valve body showing a cylinder system of an emergency shutoff valve device according to a first embodiment of the present invention, and FIG. 2 is a fully closed valve body shown across the cylinder system. Similarly, FIG. 3 is a plan view of the valve body fully opened across the cylinder system.

  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 cylinder-shaped valve drive control mechanism 4 controls the opening and closing of the ball-shaped valve body 2 accommodated in the valve body 3 via the valve shaft 3.

The valve drive control mechanism 4 has a cylinder diameter substantially equal to or larger than that of the first cylinder 6 at both ends of the body body 5 facing the valve shaft 3 of the valve body 2, for example, the first cylinder 6 on the right side. The conventional double-acting torque cylinder in which the second cylinder 7 is arranged on the left side, and the first and second cylinders 6 and 7 are symmetrically arranged so as to be positioned on the same straight line in the axial direction. Is used.
A first piston 8 is slidably provided in the first cylinder 6, and a second piston 9 is slidably provided in the second cylinder 7. The first and second pistons 8, 9 are The first and second cylinders 6 and 7 are connected to both end portions 10a and 10b of the piston rod 10 extending in the axial direction across the cylinders 7 and 7, respectively.

The second piston 9 includes a stopper piston 11 made of an annular body slidably provided in the second cylinder 7 in the axial direction, an annular groove 12 formed on the inner peripheral surface of the annular body of the stopper piston 11, A valve opening restriction piston 13 is provided in the annular groove 12 so as to be slidably fitted in the axial direction.
The valve opening restriction piston 13 is connected to the other end portion 10b of the piston rod 10 having the first piston 8 connected to the one end portion 10a, and the left and right inner walls facing the axial direction of the annular groove 12, that is, the annular groove. The stroke length is regulated so that it can slide between the inner walls 12a, 12b regulating the groove width of the twelve.

As shown in FIG. 3, the second piston 9 can come into contact with the right side surface of the valve opening restriction piston 13 against the right inner wall 12 b of the annular groove 12 in the stopper piston 11 when the valve body 2 is fully opened. In addition, a gap a is formed between the left side surface of the valve opening restriction piston 13 and the left inner wall 12a of the annular groove 12, and the valve opening restriction piston is determined by the width of the gap a in the axial direction. The valve body operation confirmation mechanism is configured such that the stroke length of 13 is regulated and the valve body 2 can be set to a predetermined desired intermediate opening.
That is, in the valve body operation confirmation mechanism, the opening degree of the valve body 2 in the valve body 1 is adjusted by adjusting the axial groove width of the annular groove 12 in the stopper piston 11 to obtain the axial width of the gap a. By changing, the drive range of the valve opening restriction piston 13 is restricted and transmitted.

The first and second pistons 8 and 9 normally supply the pressure air from the fluid supply source to the cylinder chambers 6a and 7a on the left side of the first and second pistons 8 and 9 via the ports P1 and P2, respectively. While being supplied, the pressure air in the right cylinder chambers 6b and 7b of the first and second pistons 8 and 9 can be discharged in the right valve opening direction by discharging through the ports P3 and P4, respectively. It is like that.
As a result, the piston rod 10 connected between the first and second pistons 8 and 9 is driven to the right and the swing arm 15 linked to the piston rod 10 via the linkage pin 14 is counterclockwise. By swinging the valve body 2, the valve body 3 of the valve body 2 is rotated to constitute a valve body opening / closing mechanism that allows the valve body 2 in the valve body 1 to be fully opened as shown in FIG. 3.

In an emergency, the valve body opening / closing mechanism switches and supplies the pressure fluid to the right cylinder chamber 6b of the first piston 8 and the right cylinder chamber 7b of the second piston 9 via ports P3 and P4, respectively. The pressure fluid in the cylinder chambers 6a and 7a on the left side of the first piston 8 and the second piston 9 is discharged through the ports P1 and P2, respectively, and the first piston 8 and the second piston 9 are left-handed. By driving in the valve closing direction, as shown in FIGS. 1 and 2, the valve body 2 of the valve body 1 is allowed to be fully closed, and the pipeline W of the equipment can be shut off. ing.
At this time, the valve opening restricting piston 13 fitted in the stopper piston 11 of the second piston 9 stops in contact with the inner wall 12a on the left side of the annular groove 12 in the stopper piston 11 in the fully closed state of the valve body 2. It is supposed to be.

  When the operation of the valve body 2 in the valve body 1 is confirmed, the valve body operation confirmation mechanism drives the first piston 8 from the position of the valve body 2 shown in FIG. While the stopper piston 11 of the second piston 9 is kept stationary, the valve opening restricting piston 13 is driven leftward so that the left side surface of the valve opening restricting piston 13 contacts the left inner wall 12a of the annular groove 12. In contact therewith, the valve body 2 is maintained at a predetermined desired intermediate opening.

Next, the opening / closing control state of the valve body 1 by the valve drive control mechanism 4 will be described based on the drawings shown in FIGS.
FIG. 4 is a schematic diagram of the cylinder control system in the fully opened state of the valve body, FIG. 5 is a schematic diagram of the cylinder control system in the fully closed state of the valve body, and FIG. It is the schematic of a cylinder control system.

  As shown in FIG. 4, the drive control circuit of the valve body opening / closing mechanism includes a first air operation switching valve 16, an emergency cutoff first electromagnetic switching valve 17 that switches the first air operation switching valve 16, A second electromagnetic switching valve 18 for confirming valve body operation connected between the first electromagnetic switching valve 17 and the first air operated switching valve 16 is connected so as to be interlocked with the first electromagnetic switching valve 17. And a second air-actuated switching valve 19.

  The first air-operated switching valve 16 is placed on the left side of the first piston 8 by bringing the first electromagnetic switching valve 17 into an energized state when the second electromagnetic switching valve 18 is in a non-energized state during normal operation of the plant equipment. The pressure air from the fluid supply source 20 is supplied to the other cylinder chamber 6a through the filter regulator 21, and is switched and interlocked so that the pressure air in the cylinder chamber 6b on the right side of the first piston 8 is discharged. One piston 8 is driven in the valve opening direction on the right side so that the valve body 2 of the valve body 1 is maintained in a fully opened state.

  When the valve body 2 in the valve main body 1 is fully opened, the second air operation switching valve 19 supplies the pressure air from the fluid supply source 20 to the cylinder chamber 7a on the left side of the second piston 9 through the filter regulator 21. Supply, discharge the pressure air of the cylinder chamber 7b on the right side of the second piston 9, and the stopper piston 11 and the valve opening restriction piston 13 of the second piston 9 cooperate to drive to the right, By driving until the right side surface of the valve opening restriction piston 13 comes into contact with the right inner wall 12 b of the annular groove 12, the valve opening degree regulating piston 13 is interposed between the left side surface of the valve opening restriction piston 13 and the left inner wall 12 a of the annular groove 12. It is switched so that the gap a is formed.

Further, as shown in FIG. 5, when the first electromagnetic switching valve 17 is in a non-energized state when the second electromagnetic switching valve 18 is in a non-energized state, as shown in FIG. Pressure air from a fluid supply source 20 such as an air tank is supplied to the cylinder chamber 6b on the right side of the first piston 8 through the filter regulator 21, and the pressure air in the cylinder chamber 6a on the left side of the first piston 8 is supplied. By discharging and driving the first piston 8 in the left valve closing direction, 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 is pressurized air from the fluid supply source 20 to the cylinder chamber 7b on the right side of the second piston 9 in the second cylinder 7 by the non-energized state of the first electromagnetic switching valve 17. Is supplied through the filter regulator 21, and the pressure air in the left cylinder chamber 7a of the second piston 9 is discharged to drive the second piston 9 to the left, whereby the valve body 2 in the valve body 1 is driven. It is switched to a fully closed state.

The energization operation of the first electromagnetic switching valve 17 and the second electromagnetic switching valve 18 is performed by a logic controller 22 installed in the control room of the plant facility. The limit switch 23 attached to the is connected.
This limit switch 23 detects the rotation operation of the valve shaft 3, that is, the opening / closing operation of the valve body 2, and feeds it back to the logic controller 22, so that 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 18 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, as shown in FIG. 6, the first electromagnetic switching valve 17 is energized. When the second electromagnetic switching valve 18 is energized, the second air operation switching valve 19 does not operate, and the pressure air from the fluid supply source 20 is supplied to the cylinder chamber 7a on the left side of the second piston 9 as a filter regulator. 21, while maintaining the state in which the pressurized air in the cylinder chamber 7b on the right side of the second piston 9 can be discharged, only the first air operation switching valve 16 is switched.
Thereby, the pressure air from the fluid supply source 20 is supplied to the cylinder chamber 6b on the right side of the first piston 8 in the first cylinder 6 constituting the valve body opening / closing mechanism through the filter regulator 21, and the first piston 8 By discharging the pressurized air from the left cylinder chamber 6a, the first piston 8 is driven in the valve closing direction to the left from the fully open position of the valve body 2.

At this time, the pressure air from the fluid supply source 20 is supplied to the left cylinder chamber 7a of the second cylinder 7 through the filter regulator 21, and the second piston 9 is still loaded with the pressure air. .
Therefore, the stopper piston 11 of the second piston 9 remains stationary, but the diameter of the first piston 8 is larger than the diameter of the valve opening restriction piston 13 and further to the right of the valve opening restriction piston 13. Since the thrust to the left is smaller than the thrust to the left of the first piston 8, the valve opening restriction piston 13 has a gap a formed between the annular groove 12 of the stopper piston 11. Only the left side is driven to abut against the left inner wall 12a of the annular groove 12 and stop.
As a result, the swing arm 15 linked to the piston rod 10 is rotated in the clockwise direction, and the valve body 2 of the valve body 1 can be closed from, for example, 100% to about 15 to 30%. Thus, the predetermined intermediate opening degree is maintained in advance.
Therefore, 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 facility is not disturbed in the operation of the facility. The valve element 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 17 during the valve body operation confirmation, the first electromagnetic switching valve 17 is de-energized and the second air operation switching valve 19 is switched. As shown in FIG. 5, the stopper piston 11 of the second piston 9 is driven to the left to allow the first piston 8 to be driven in the valve closing direction to the left. Is fully closed.

  After the valve body operation is confirmed, the energized state of the second electromagnetic switching valve 18 is released by the feedback signal fed back from the limit switch 23 to the logic controller 22, and the valve body 2 is returned to the fully open state at the normal time.

FIG. 7 is a schematic view of a cylinder control system in a fully closed 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 shutoff valve device of the present embodiment, the emergency shutoff first electromagnetic switching valve 25 constituting the drive control circuit of the valve drive control mechanism 24 and the second electromagnetic switching valve 26 for checking the valve body operation are interposed. In addition, a manual switching valve 27 that enables manual operation for confirming valve body operation at the valve installation site is provided.
By the push operation of the manual switching valve 27, the first air operation switching valve 28 is switched to check the valve body operation, thereby confirming the operation of the valve body in the valve body. It can be carried out both by remote operation from a position distant from the 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 fully closed 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

DESCRIPTION OF SYMBOLS 1 Valve body 2 Valve body 3 Valve shaft 4 Valve drive control mechanism 5 Body main body 6 1st cylinder 6a Cylinder chamber 6b Cylinder chamber 7 2nd cylinder 7a Cylinder chamber 7b Cylinder chamber 8 1st piston 9 2nd piston 10 Piston rod 10a End Part 10b End part 11 Stopper piston (annular body)
12 annular groove 12a inner wall 12b inner wall 13 valve opening restriction piston 14 linkage pin 15 swing arm 16 first air operated switching valve 17 first electromagnetic switching valve 18 second electromagnetic switching valve 19 second air operated switching valve 20 fluid supply source 21 Filter Regulator 22 Logic Controller 23 Limit Switch 24 Valve Drive Control Mechanism 25 First Electromagnetic Switching Valve 26 Second Electromagnetic Switching Valve 27 Manual Switching Valve 28 First Air Actuation Switching Valve 01 Valve Body 02 Valve Body 03 Valve Shaft 04 Body Body 05 First cylinder 05a Cylinder chamber 05b Cylinder chamber 06 Second cylinder 06a Cylinder chamber 06b Cylinder chamber 07 Piston rod 08 First piston 09 Second piston 010 Linking pin 011 Swing arm a Gap P1-P4 Port W Pipeline

Claims (5)

The first cylinder and the second cylinder are arranged on the same straight line in the axial direction at both ends of the body body facing the valve shaft of the valve body in the valve body connected to the pipeline. In addition, in the first and second cylinders, a first piston and a second piston connected to both ends of a piston rod linked to the valve shaft are slidable in the axial direction, respectively. 1. Supply the pressure fluid from the fluid supply source to the cylinder chambers on one side of the first and second pistons slidable in the second cylinder, and drive the first and second pistons in the valve opening direction, respectively. By making the valve body fully open through the valve shaft linked to the piston rod, the pressure fluid is switched and supplied to the cylinder chambers on the other side of the first and second pistons in an emergency, First, By driving in the closing direction two pistons respectively in the emergency shut-off valve device comprising a double-acting cylinder for the valve is fully closed,
The second piston is slidable in the axial direction in the second cylinder, and has a stopper piston having an annular groove formed on the inner peripheral surface of the annular body, and slides in the axial direction in the annular groove of the stopper piston. And a valve opening restricting piston connected to the other end of the piston rod connected to the other end of the piston rod.
When the valve element is fully opened, the valve opening restricting piston of the second piston is slidably brought into contact with the other inner wall from one inner wall that restricts the groove width of the annular groove in the stopper piston. Forming a gap between the one inner wall of the groove and the valve opening restriction piston; and
When confirming the operation of the valve body, in a fully open state of the valve body, by switching the pressure fluid in the cylinder chamber on one side of the first piston so that the pressure fluid can be supplied to the cylinder chamber on the other side, By regulating the drive range of the valve opening restriction piston when the first piston is driven in the valve closing direction from the fully opened position of the valve body, the valve body is determined in advance by regulating the axial width of the gap. An emergency shut-off valve device characterized in that the desired intermediate opening can be maintained. Pressure fluid from a fluid supply source is supplied to the cylinder chambers on one side of the first and second pistons in the first and second cylinders, respectively, and the pressure in the cylinder chambers on the other side of the first and second pistons A first fluid operation switching valve for discharging the fluid to drive the first and second pistons 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 chambers on the other side of the first and second pistons, and on one side of the first and second pistons. A first electromagnetic switching valve for emergency shut-off that switches the valve body to the fully closed state by driving the first and second pistons in the valve closing direction by discharging the pressure fluid in the cylinder chamber; ,
When the valve body is in a non-energized state via the 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 valve element is fully opened. When the state and the fully closed state are allowed and the energized state is maintained, the stopper piston of the second piston is kept stationary, and the valve opening restriction pistons of the first piston and the second piston are fully opened. The emergency shut-off valve according to claim 1, wherein the valve body opening / closing mechanism is constituted by a second electromagnetic switching valve for confirming valve body operation for switching the first fluid operation switching valve so that the valve can be driven in a valve closing direction. apparatus. The second fluid operation switching valve interlocked with the first electromagnetic switching valve constitutes a valve body operation confirmation mechanism, and the second fluid operation switching valve is connected to the cylinder chamber on one side of the second piston in the second cylinder. And the second piston is stopped at the fully open position of the valve body when the first electromagnetic switching valve is energized by discharging the pressure fluid in the cylinder chamber on the other side of the second piston,
In the energized state of the second electromagnetic switching valve at the time of confirming the operation of the valve body, the first air operation valve is switched, and the valve opening restriction piston of the second piston that is driven in the valve closing direction of the valve body is maintained stationary. The valve body can be maintained at a predetermined desired intermediate opening by contacting one inner wall of the annular groove in the stopper piston of the second piston,
In the non-energized state of the first electromagnetic switching valve at the time of emergency shutoff, pressure fluid is supplied to the cylinder chamber on the other side of the second piston, and the pressure fluid in the cylinder chamber on one side of the second piston is discharged. Thus, the emergency shut-off valve device according to claim 1 or 2, wherein the second piston can be switched and controlled to stop at the fully closed position 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 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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