JP2005163962A - Emergency cutoff valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency cutoff valve with an opening limiting mechanism capable of confirming the operation in a state of keeping an opening at a degree not causing troubles in the operation of equipment in inspection, besides the complete opening in operating the equipment and the complete closing at occurrence of abnormality. <P>SOLUTION: In this emergency cutoff valve comprising a valve main body 1 connected with a pipeline 6, and a driving means for rotating and driving a valve shaft 7 mounted on a valve element 5 of the valve main body 1, and closing the valve main body 1 by rotating the valve shaft 7 by the driving means 2 in emergency, a rotor 17 is fixed to the valve shaft 7, an adaptor 16 is mounted at an outer part of the rotor 17 in a state of being fixed to a yoke 15, the rotor 17 is provided with an engagement part 18, the adaptor 16 is provided with a stopper member 19 to be engaged with and disengaged from the engagement part 18, the rotation of the valve shaft 7 is restricted by the engagement of the engagement part 18 and the stopper member 19 to limit the opening of the valve main body 3 not to be less than a predetermined value in operating the valve. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an emergency shut-off valve provided with an opening restriction mechanism that restricts a valve of an emergency shut-off valve provided in a pipeline of pressure gas or the like so as not to be closed below a predetermined opening.

  2. Description of the Related Art Conventionally, an emergency shut-off valve that shuts off the supply of gas when an abnormality occurs in equipment is provided in a pipeline such as pressure gas. That is, a valve main body composed of a ball valve or the like is connected to the pipeline, and the valve main body is closed by driving means based on a signal that detects an abnormality in the equipment. As this driving means, an electric type, a weight type, a pneumatic torque cylinder or the like is used (for example, see Patent Document 1).

Moreover, the technique which provided the opening degree limiting device in the general rotary valve which is not an emergency cutoff valve is disclosed. That is, a protrusion is attached to the valve shaft, and the valve opening is restricted by restricting the rotation of the valve shaft with a stopper bolt that collides with the protrusion (see, for example, Patent Document 2).
JP-A-7-269730 JP 2003-74740 A

  In general, the emergency shut-off valve cannot be closed during the operation of the equipment, but must be operated so as to be surely closed by the driving means when an abnormality occurs in the equipment. By the way, during the periodic inspection of equipment once a year or several years, the operation of the emergency shut-off valve is checked. To improve the reliability, whether or not the emergency shut-off valve operates normally during equipment operation. It is preferable to confirm. However, the conventional emergency shut-off valve has a problem that the operation of the emergency shut-off valve cannot be confirmed during the operation of the equipment because the valve opening degree can select only two operations of 100% and 0%.

  Patent Document 2 describes an emergency shut-off valve provided with a stopper bolt that finely adjusts the position of the valve body when the valve is fully opened and fully closed. Even if the valve is retracted, the projecting portion hits the inner wall of the outer shell. Therefore, with this configuration, the valve cannot be stopped at the intermediate closing position, or the intermediate stopping function cannot be completely released.

  In view of the above-mentioned problems of the conventional technology, the present invention maintains an opening degree that does not hinder the operation of the equipment at the time of inspection in addition to the complete opening at the time of equipment operation and the complete closing at the time of occurrence of an abnormality. An object of the present invention is to provide an emergency shut-off valve with an opening restriction mechanism that enables confirmation of operation in a state.

According to the present invention, the above problem is solved as follows.
(1) A valve body connected to the pipeline, and a drive means for rotationally driving a valve shaft attached to the valve body of the valve body, and the valve body is rotated by the drive means in an emergency. In the emergency shut-off valve, the rotating body is fixed to the valve shaft, and the adapter is fixedly disposed on the outer side of the rotating body, and either the rotating body or the adapter is disposed. An engaging portion is provided on the other side, and a stopper member that engages and disengages from the engaging portion is provided on the other side, and the rotation of the valve shaft is restricted by the engagement between the engaging portion and the stopper member. The opening of the valve body at is limited so as not to be less than a predetermined value.

(2) In the above item (1), the engaging portion is constituted by a flat surface in which a part of the outer periphery of the rotating body is cut out.

(3) In the above item (1), the engaging portion is constituted by an engaging groove formed along the outer peripheral surface of the rotating body.

(4) In any one of the above items (1) to (3), the stopper member is constituted by a bolt screwed into an adapter.

(5) In any one of the above items (1) to (3), the stopper member is constituted by a pin slidably attached to the adapter.

(6) In any one of the above items (1) to (3), the stopper member is configured to be a plunger that is slidably inserted into the adapter and biased in a direction away from the rotating body by a spring, and the plunger is Pushing means for pushing in the direction of the rotating body against the spring is provided.

(7) In the above section (6), the plunger pushing means is constituted by an eccentric cam and a lever for rotating the eccentric cam.

(8) In the above item (7), a flat surface that contacts the end surface of the plunger is formed on the outer circumference of the long diameter portion and the short diameter portion of the eccentric cam.

(9) In the above item (7) or (8), a lock for locking the lever of the eccentric cam is provided at a position where the plunger is separated from the rotating body.

According to the present invention, the following effects can be achieved.
(a) According to the invention described in claim 1, since the opening degree of the valve body can be restricted by restricting the rotation of the rotating body fixed to the valve shaft, the emergency shut-off valve is opened and closed at the time of inspection. However, it is possible to confirm the operation in a state in which the opening degree is not closed and the moderate opening degree is maintained, and it is possible to confirm the operation of the emergency shut-off valve without stopping the facility operation. In addition, the mechanism for limiting the opening degree is provided with an engaging portion on one of the rotating body and the adapter, and a stopper member that engages and disengages with the engaging portion on the other, and the engagement between the engaging portion and the stopper member. Since the rotation of the valve shaft is restricted, the opening can be set simply by setting the stopper member to the engaged position during inspection, and the stopper member must be removed from the engaged position during normal operation. Thus, the function as an emergency shutoff valve can be activated. Furthermore, since the opening restriction mechanism has a mechanical configuration, the configuration is simple, reliable, and inexpensive.

  (b) According to the second aspect of the present invention, since the engaging portion is constituted by a flat surface obtained by cutting a part of the outer periphery of the rotating body, the engaging portion can be formed only by notching without attaching other accessories. It can be easily formed.

  (c) According to the invention described in claim 3, since the engaging portion is constituted by the engaging groove formed on the outer periphery of the rotating body, the engaging portion can be easily formed only by groove processing without attaching other accessories. can do.

  (d) According to the invention of claim 4, since the stopper member is constituted by the bolt screwed into the adapter, the stopper member can be easily set at the engagement / disengagement position only by screwing operation.

  (e) According to the invention described in claim 5, since the stopper member is constituted by the pin slidably attached to the adapter, the stopper member can be easily set at the engaging / disengaging position only by the sliding operation.

  (f) According to the invention described in claim 6, the stopper member is constituted by a plunger biased in a direction away from the rotating body by a spring, and a pushing means for pushing the plunger against the spring in the direction of the rotating body is provided. Therefore, the stopper member can be easily set at the engagement / disengagement position only by operating the pushing means.

  (g) According to the invention as set forth in claim 7, since the pushing means of the plunger is constituted by the eccentric cam and the lever for rotating the eccentric cam, only the eccentric cam is rotated by the lever. The stopper member can be easily set at the engaging / disengaging position.

  (h) According to the invention described in claim 8, since the flat surfaces that contact the end surfaces of the plunger are formed on the outer circumferences of the long diameter portion and the short diameter portion of the eccentric cam, when the flat surface approaches the end surface of the plunger, The end face is securely and stably engaged, and the engagement is not distracted even when an unintended external force is applied to the lever.

  (i) According to the invention described in claim 9, since the lock for locking the lever of the eccentric cam is provided at a position where the plunger is separated from the rotating body, it is possible to prevent the plunger from being pushed in by an erroneous operation during the operation of the equipment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a longitudinal sectional view of a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.

  As shown in the figure, this emergency shut-off valve is provided between the valve body (1), the drive means (2) of the valve body (1), and between the valve body (1) and the drive means (2). And an opening degree limiting mechanism (3).

  The valve body (1) is a ball valve in which a valve body (5) is provided in a valve case (4), and is connected to a pipeline (6). A valve shaft (7) extending upward is connected to the valve body (5).

  The drive means (2) is a pneumatic torque cylinder, and a pair of pistons (10) connected by a piston rod (9) is provided in the cylinder (8), and air is supplied to both ends of the cylinder (8). An air supply pipe (11) is connected. The piston rod (9) is provided with transmission means (12) for converting the reciprocating motion of the piston rod (9) into a rotational motion and transmitting it to the valve shaft (7). As this transmission means (12), for example, a locking pin (13) protruded from the piston rod (9), and a bifurcated locking piece (14) attached to the upper end of the valve shaft (7) The locking pin (13) is engaged with the tip of the locking piece (14), and the locking pin (13) is swung by the left and right movement of the locking pin (13). A torque cylinder mechanism in which (7) is rotated is used.

  Above the valve case (4), a yoke (15) and an opening restriction mechanism (3) thereon are provided so as to surround the valve shaft (7). That is, an annular adapter (16) is interposed between the upper part of the yoke (15) and the cylinder (8). A substantially cylindrical rotating body (17) is attached to an angular shaft portion (7a) in the middle of the valve shaft (7). As shown in FIG. 2, the rotating body (17) has an engaging portion (18) formed of a flat portion with a part of the circumferential surface cut out on the outer periphery of the upper end portion. A stopper member (19) made of a bolt is screwed into the adapter (16).

  As shown in FIG. 2 (a), when the stopper member (19) is retracted to a position where it does not hit the rotating body (17), the rotating body (17) can rotate freely, and the normal position shown in FIG. That is, it rotates to the fully open position of the valve body (1).

  As shown in FIG. 2 (b), when the stopper member (19) is protruded into the adapter (16), the tip of the stopper member (19) comes into contact with the engaging portion (18), and the rotating body (17) Rotation of is to be regulated. As shown in the figure, when the position where the engaging portion (18) is orthogonal to the chain line (L0) is the fully closed position of the valve body (1), the engaging portion (18) contacts the stopper member (19). At the position of the chain line (L1), the valve body (1) is open by an amount corresponding to the angle (α). Without such an opening restriction mechanism (3), the valve body (1) must be completely closed when confirming the operation of the emergency shut-off valve, which causes trouble in the operation of the equipment. The opening degree can be limited so that the stopper member (19) is not inserted below the predetermined opening degree by simply inserting the stopper member (19) to the engaging position at the time of inspection. The larger the amount of protrusion of the stopper member (19), the smaller the amount of rotation of the rotating body (17), so the opening degree at the time of closing increases. The opening at this time may be any value as long as the opening does not hinder the operation of the facility.

  FIG. 3 is a longitudinal side view of the second embodiment of the present invention, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

  In this embodiment, the engagement groove (20) having a predetermined length is formed along the outer circumferential surface of the rotating body (17). A stopper member (19) made of a pin is slidably inserted into the adapter (16). The locking pin (21) protruding to the side of the stopper member (19) moves along the guide groove (22) of the adapter (16), and this locking pin (21) is the bottom of the guide groove (22). The stopper plate (19) is inserted into the engaging groove (20) at the position shown in FIG. 4 (a), and the locking pin (21) is attached to the outer periphery of the adapter (16). When hitting (23), the stopper member (19) is retracted to a position disengaged from the engagement groove (20), and the rotating body (17) can rotate freely. Since the opening varies depending on the position of the groove end of the engagement groove (20), the limit opening can be arbitrarily set by setting the length of the engagement portion (18) in advance. If the locking pin (21) is locked in a groove or the like (not shown) formed in the adapter (16) at the position of FIG. 4 (a), the stopper member (19) is retracted. Can be prevented.

FIG. 5 is a partially cutaway plan view corresponding to FIG. 2 or 4 of the third embodiment of the present invention.
Similar to the second embodiment, an engagement groove (20) having a predetermined length is formed along the circumferential surface of the outer periphery of the rotating body (17). The adapter (16) is inserted with a stopper member (19) composed of a plunger urged toward the outer periphery of the adapter (16) by a coil spring (24). The eccentric cam (25) is attached to the eccentric shaft (26) pivotally supported by the adapter (16) so that the outer end surface of the stopper member (19) contacts. Flat surfaces (25a) and (25b) are formed on the outer periphery of the eccentric cam (25) at two locations, a long diameter portion and a short diameter portion, respectively, and a lever (27) is attached to the outer periphery. Stoppers (28) and (29) are attached to the adapter (16), located on both sides of the eccentric cam (25), and the lever (27) Is fixed to the stopper (28).

  As shown in FIG. 5B, when the lever (27) is rotated until it contacts the upper stopper (28), the eccentric cam (25) opposes the stopper member (19) against the coil spring (24). The flat surface (25a) on the long diameter side of the eccentric cam (25) comes into contact with the outer end surface of the stopper member (19). At this time, when the flat surface (25a) approaches the outer end surface of the stopper member (19) by the rotation of the eccentric cam (25), the flat surface (25a) engages with the stopper member (19) by a quick motion. In this state, the tip of the stopper member (19) enters the engagement groove (20). As shown in FIG. 5 (a), when the lever (27) is rotated until it contacts the lower stopper pin (29), the stopper member (19) is pushed by the coil spring (22) and protrudes outward, The flat surface (25b) on the short diameter side of the eccentric cam (25) contacts the outer end surface of the stopper member (19). In this state, the stopper member (19) is retracted to a position disengaged from the engaging groove (20), and the rotating body (17) can rotate freely.

  During facility operation, the emergency shut-off valve needs to close normally when an abnormality occurs. Therefore, the lever (27) is locked to the stopper (29) by the lock (31) for preventing misuse of the opening degree limiting mechanism (3). In the first and second embodiments, it is preferable to close the hole for inserting the stopper member (19) with a cover or the like during the operation of the facility in order to prevent the opening degree limiting mechanism (3) from being misused.

  In the above embodiment, the stopper member (19) is attached to the adapter (16) and engaged with the engaging portion (19) or the engaging groove (20) of the rotating body (17). Good. For example, a configuration may be adopted in which a stopper member (19) such as a bolt or a pin is attached to the rotating body (17), and a long hole in the circumferential direction in which the stopper member (19) is fitted is formed in the adapter (16).

  In the embodiment, the adapter (16) is provided on the yoke (15), but the yoke (15) and the adapter (16) may be integrated. Further, the adapter (16) is not limited to a cylindrical one, but may be a bracket-like one attached to a fixed part such as the cylinder (10) or the yoke (15).

It is the side view which fractured | ruptured a part of 1st Embodiment of this invention. Similarly, it is the II-II sectional view taken on the line of FIG. It is the side view which fractured | ruptured a part of 2nd Embodiment of this invention. Similarly, it is the IV-IV sectional view taken on the line of FIG. It is a cross-sectional top view of the part similar to FIG. 4 of 3rd Embodiment of this invention.

Explanation of symbols

(1) Valve body
(2) Driving means
(3) Opening limit mechanism
(4) Valve case
(5) Valve body
(6) Pipeline
(7) Valve stem
(7a) Square shaft
(8) Cylinder
(9) Piston rod
(10) Piston
(11) Air supply pipe
(12) Transmission means
(13) Locking pin
(14) Locking piece
(15) York
(16) Adapter
(17) Rotating body
(18) Engagement part
(19) Stopper member
(20) Engagement groove (engagement part)
(21) Locking pin
(22) Guide groove
(23) Locking plate
(24) Coil spring
(25) Eccentric cam
(25a) Flat part
(25b) Flat part
(26) Eccentric shaft
(27) Lever
(28) (29) Stopper
(30) Set screw
(31) tablets

Claims (9)

A valve main body connected to the pipeline; and a driving means for rotationally driving a valve shaft attached to the valve body of the valve main body, and the valve main body is rotated by the driving means to close the valve main body in an emergency. In the emergency shut-off valve
A rotating body is fixed to the valve shaft, an adapter is fixedly disposed on the outer side of the rotating body, an engaging portion is provided on either the rotating body or the adapter, and the other is engaged with the engaging body. A stopper member that engages and disengages is provided in each part, and the opening of the valve body during valve operation is determined in advance by regulating the rotation of the valve shaft by the engagement between the engaging part and the stopper member. An emergency shut-off valve characterized by being restricted so as not to be less than the value.   The emergency shut-off valve according to claim 1, wherein the engaging portion is constituted by a flat surface in which a part of the outer periphery of the rotating body is cut out.   The emergency shut-off valve according to claim 1, wherein the engaging portion is configured by an engaging groove formed along the outer peripheral surface of the rotating body.   The emergency shut-off valve according to any one of claims 1 to 3, wherein the stopper member is constituted by a bolt screwed into an adapter.   The emergency shut-off valve according to any one of claims 1 to 3, wherein the stopper member is composed of a pin slidably attached to the adapter.   The stopper member is constituted by a plunger that is slidably inserted into the adapter and is biased in a direction away from the rotating body by a spring, and a pushing means for pushing the plunger against the spring in the direction of the rotating body is provided. The emergency shutoff valve according to any one of claims 1 to 3.   7. The emergency shut-off valve according to claim 6, wherein the plunger pushing means comprises an eccentric cam and a lever for rotating the eccentric cam.   8. The emergency shut-off valve according to claim 7, wherein a flat surface is formed on the outer circumference of the long diameter portion and the short diameter portion of the eccentric cam so as to contact the end surface of the plunger. The emergency shut-off valve according to claim 7 or 8, wherein a lock for locking the lever of the eccentric cam is provided at a position where the plunger is separated from the rotating body.

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