JP2014163396A - Emergency cutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the rotation resistance of a handle, to easily hold a valve rod in a valve-opened state, and to improve operability.SOLUTION: A bush 10 is fixed into valve rod support hardware 6 in an upper part of a valve box 3, and in the bush, a plurality of pockets for rollingly holding balls 9 are formed at equal intervals in circumferential directions. A valve rod 5 which vertically moves in the bush, and is held to pull-up hardware 7 having a locking groove 7b at its entire circumference by screw-joining is energized downwardly. A sleeve 11 which vertically moves at an external periphery of the bush, and has a groove 22 at its entire circumference is energized upwardly, and an operation shaft 13 is rotatably held to the valve rod support hardware. The pull-up hardware vertically moves, a locking groove opposes the pockets of the bush, the balls are fit into the locking groove, and the pull-up hardware is locked to the balls. The sleeve moves downwardly by being pressed to a protrusion 13a by the rotation of the operation shaft, the groove of the sleeve opposes the pockets of the bush, the balls move to the groove and are removed from the locking groove of the pull-up hardware, the valve rod 5 moves downwardly, and a valve body 4 is seated on a valve seat 2 and brought into a valve-closed state.

Description

  The present invention relates to an emergency shutoff valve that is attached to piping of a fuel oil tank of a ship.

  Generally, an emergency shut-off valve is attached to the fuel oil tank piping of a ship. When an emergency situation such as a fire occurs, the emergency shut-off valve is shut off remotely to close the fuel oil tank piping. Yes.

  As such an emergency shutoff valve, as shown in FIG. 12, a valve rod support metal 73 is fixed to the upper part of a valve box 70 having a fuel oil flow path 71 and a valve seat 72, and the valve rod support metal 73 A cylindrical pull-up metal 75 having a handle 74 is inserted into the pull-up metal 75 so as to be movable in the vertical direction, and a valve body 77 is provided at the tip of a valve rod 76 that is screwed into the pull-up metal 75. A spring member 79 provided between a spring receiver 78 fixed to the rod 76 is provided with an operating shaft 80 that urges the valve rod 76 downward and engages with a pull-up metal 75 to keep the valve open. Proposed (for example, Patent Document 1)

  The valve stem support metal 73 of the emergency shut-off valve has a groove 73 a having a semicircular cross section on the contact surface with the pull metal 75, and the pull metal 75 has a semicircular cross section on the contact surface with the valve rod support 73. Groove 75a. The grooves 73a and 75a form a through hole 81 that holds the operating shaft 80 at a right angle to the valve rod 76 and rotatably.

  The operating shaft 80 held in the through hole 81 has a lever 82 fixed to one end thereof, is formed in a semicircular shape by cutting out a position corresponding to the through hole 81, and a part of the semicircular portion is pulled up. The valve body 77 of the valve rod 76 is held in the valve-opened state by being locked to the metal object 75 via the pull-up metal object 75.

  A fuse socket 83 containing a soluble piece (not shown) is attached to the valve box 70, and its rod 84 is connected to a small lever 85 fixed to the operating shaft 80. The small lever 85 is fixed to the operating shaft 80 in a straight line with the lever 82. When the environmental temperature rises to a predetermined temperature and the fusible piece melts, the small lever 85 moves in a direction in which the rod 84 is pulled into the fuse socket 83, and the small lever 85 The lever 82 is rotated via the.

  This emergency shut-off valve is normally connected to a lever 82 by a wire or a rod of an air cylinder (not shown) and can be operated remotely. When an emergency such as a fire occurs, the lever 82 is rotated by a remote operation using a wire or an air cylinder, or a manual operation, and the semicircular portion of the operating shaft 80 is completely stored in the groove 73 a of the valve rod support metal 73. As a result, the engagement between the operating shaft 80 and the pulling hardware 75 is released, the valve rod 76 is moved downward by the urging force of the spring member 79, the emergency shut-off valve is closed, and the fuel oil tank pipe is immediately connected. Close.

  Also, even when remote operation with a wire or manual operation is delayed in the event of an emergency, the fusible piece dissolves as the environmental temperature rises, and the rod 84 protrudes, causing the small lever 85 to rotate, Close the shut-off valve.

Japanese Utility Model Publication No. 62-24149

  In the above-described emergency shut-off valve, the pull-up metal 75 screwed to the valve stem 76 is urged toward the valve box 70 by the spring member 79, so The inner surface of the groove 75a of the pulling hardware 75 is pressed against the surface. Since this pressing always occurs when the handle 74 is rotated, the frictional resistance increases, and the rotation operation of the handle 74 becomes heavy.

  Further, since the pulling metal 75 is locked to the operating shaft 80 at one place in the circumferential direction, when it is biased downward via the valve rod 76 by the spring member 79, it operates at one place in the circumferential direction. The shaft 80 is supported. In this state, the outer peripheral portion of the pull-up metal 75 and the inner wall of the valve rod support metal 73 on the opposite side in the diameter direction with respect to the locking position with the operating shaft 80 abut against each other, and the frictional resistance increases between them. The rotation operation of the handle 74 becomes heavy.

  Further, after the valve is closed, the handle 74 is rotated in order to hold the valve rod 76 in the valve-opened state with the pulling metal 75, and the groove 75a of the pulling metal 75 is opposed to the groove 73a of the valve rod support metal 73. That is, it is necessary to move to a position where the operating shaft 80 can be locked.

  However, since the position of the groove 75a of the pull-up hardware 75 is difficult to see from the outside, it is difficult to know whether the pull-up metal 75 is located at a position where the operation shaft 80 can be locked. For this reason, it is difficult to lock the pull-up metal 75 on the operating shaft 80 and hold the valve rod 76 in the valve open state.

  In addition, when the operating shaft 80 is rotated by operating the lever 82 in a state where the locking position of the operating shaft 80 is shifted, the semicircular portion of the operating shaft 80 bites into the inner surface of the groove 75a of the pulling hardware 75. Or the side edge of the groove 75a is recessed.

  When such bite and dent occur, the frictional resistance between the outer peripheral surface of the semicircular portion of the operating shaft 80 and the inner surface of the groove 75a of the pulling metal 75 increases, and the rotation operation of the handle 74 becomes heavy.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an emergency shut-off valve that improves the operability by reducing the rotational resistance of the handle and easily holding the valve stem.

In order to solve the above-described problems, an emergency shutoff valve according to the present invention includes a valve box having a valve seat, a valve stem support metal fixed above the valve box, and a fixed valve body in the valve stem support metal. A bushing that is inserted into the bush so as to be movable in the vertical direction, a valve rod that has a valve body and is held by screw connection to the lifting metal, and a spring that biases the valve rod downward A member, a sleeve fitted to the outer periphery of the bush so as to be movable in the vertical direction, an inner spring member for biasing the sleeve upward, and an operating shaft rotatably held by the valve stem support metal Prepared,
The bush has a plurality of pockets for holding the ball so as to be able to roll at equal intervals in the circumferential direction, the pulling metal rotates integrally with the handle, and the locking groove into which the ball fits is formed on the outer periphery of the pulling metal. A groove is formed on the inner periphery of the sleeve, and the operating shaft has a protrusion that presses the sleeve downward by rotation;
When the pulling metal moves upward and the locking groove faces the pocket of the bush, the ball in the pocket of the bush fits into the locking groove, and the pulling metal is held in the locked state by the ball. When the operating shaft rotates and the groove of the sleeve, which moves downward by the protrusion, faces the pocket of the bush, the ball moves toward the groove and disengages from the locking groove of the pulling hardware. The valve rod is moved downward so that the valve element is seated on the valve seat to be closed.

  In this configuration, it is possible to adopt a configuration in which the groove inner surface on the lower side of the bush is formed as an inclined surface radially inward toward the lower side.

  The emergency shut-off valve according to the present invention moves upward, and the pull-up hardware locked to the plurality of balls in the pocket of the bush is supported at a plurality of locations in the circumferential direction by the plurality of balls at equal intervals. For this reason, even if the pulling metal is urged downward via the valve rod by the spring member, the outer peripheral surface of the pulling metal does not hit the inner wall of the valve rod supporting metal, and the rotational resistance of the pulling metal Does not grow.

  Further, since the plurality of balls roll while making point contact with the outer peripheral portion or the groove inner surface of the locking groove when the pulling metal is rotating, the rotational resistance of the pulling metal can be reduced.

  Further, when the pulling metal is moved upward by the rotation of the handle, the locking groove of the pulling metal faces the pocket of the bush. At this time, since the ball in the pocket moves inward in the radial direction, the ball automatically fits into the locking groove of the pulling hardware, and the ball can be easily locked to hold the valve stem. it can.

1 is a longitudinal sectional view of an emergency shutoff valve according to a first embodiment of the present invention. Sectional drawing in the AA line of FIG. Side view showing the operating shaft and air cylinder of the emergency shutoff valve (A) The principal part enlarged view which shows the valve opening state same as the above, (b) Sectional drawing in the BB line of Fig.4 (a) (A) The principal part enlarged view which shows the valve closing state same as the above, (b) Sectional drawing in CC line of Fig.5 (a) Vertical sectional view showing the closed state of the emergency shutoff valve Longitudinal sectional view showing the lifted hardware from the closed state Longitudinal sectional view of an emergency shutoff valve according to a second embodiment of the present invention (A) Sectional view taken along line DD in FIG. 8, (b) Sectional view showing a state in which the operating shaft is rotated. Vertical sectional view of an emergency shutoff valve according to a third embodiment of the present invention Main part enlarged view showing the valve open state Longitudinal section showing a conventional emergency shutoff valve

Hereinafter, an emergency shutoff valve according to a first embodiment of the present invention will be described with reference to FIGS.
The emergency shut-off valve 1 includes a valve box 3 having a valve seat 2, a valve rod support metal 6 fixed above the valve box 3, a bush 10 fitted and fixed in the valve rod support metal 6, A pulling metal 7 inserted through the bush 10 so as to be movable in the vertical direction, a valve rod 5 having a valve body 4 held by screw connection to the pulling metal 7, and a spring member 8 for urging the valve rod 5 downward. A sleeve 11 fitted to the outer periphery of the bush 10 so as to be movable in the vertical direction, an inner spring member 12 that urges the sleeve 11 upward, and an operating shaft 13 that is rotatably held by the valve rod support metal 6. It has.

  The valve box 3 includes a partition wall 3a that separates the upstream side and the downstream side of the flow path of the fuel oil, an opening 3b is formed in the partition wall 3a, and a valve seat 2 is formed at the peripheral edge on the upstream side of the opening 3b. ing. The upper side of the partition wall 3a is the upstream side of the fuel oil flow path, and the lower side of the partition wall 3a is the downstream side of the fuel oil flow path.

  The upper side of the flow path on the upstream side of the valve box 3 is open, and this opening is closed by a bolted lid member 14, and a through hole 14 a is formed in the lid member 14. The upper part of the through hole 14 a is formed to have a larger diameter than the lower part, and a packing 15 that keeps the fluid tightness between the valve stem 5 and the valve box 3 is accommodated in the larger diameter part.

  The valve body 4 is provided at one end (lower end) of the valve stem 5 on the valve box 3 side. When the valve body 4 is seated on the valve seat 2, the opening 3b of the valve box 3 is closed, and the flow of fuel oil The road is shut off and closed. The valve stem 5 passes through the through-hole 14a of the lid member 14 and protrudes above the valve box 3, and is movable in a direction (vertical direction) toward or away from the valve seat 2. The valve body 4 comes in contact with and separates from the valve seat 2 by the movement of.

  A valve stem support 6 is fixed above the valve box 3 via a column 16. The valve stem support metal 6 includes a cylindrical small-diameter portion 17, a cylindrical large-diameter portion 18 integrally formed on the valve box 3 side with respect to the small-diameter portion 17, and a cylindrical operating shaft holding in communication therewith. Part 19.

  The central axes of the small diameter portion 17 and the large diameter portion 18 coincide with the central axis of the valve stem 5 that approaches or separates from the valve seat 2, and the central axis of the operating shaft holding portion 19 is orthogonal. As shown in FIG. 2, the large-diameter portion 18 has a fixed portion 6 a extending on both sides in the diametrical direction at the lower end portion, and the valve stem support metal 6 is fixed to the support column 16 by both the fixed portions 6 a.

  The bush 10 is fitted into the small-diameter portion 17 of the valve stem support metal 6, and the small-diameter portion 17 and the other end surface (upper end surface) of the bush 10 are aligned and fixed to the valve stem support metal 6 integrally. Yes. One end side (lower end side) of the bush 10 protrudes from the large diameter portion 18 of the valve rod support metal 6 toward the valve box 3, and a radially outward flange 10b is formed at one end portion (lower end portion). The upper portion of the bush 10 is formed to have a smaller inner diameter than other portions, and a step portion 10a is formed on the inner peripheral surface by the upper portion and the other portions (FIGS. 4A and 5A). reference).

  Further, the bush 10 has pockets 10c formed at equal intervals in six locations in the circumferential direction, and each pocket 10c is located in the large diameter portion 18 of the valve stem support metal 6 so that the ball 9 can roll. Is retained. The pockets 10c only need to be formed at equal intervals in two or more locations in the circumferential direction. In order to stably support the pulling hardware 7 with the balls 9 at equal intervals in the circumferential direction, the pockets 10c may be formed at least at three locations. Preferably, it is more preferably formed at six locations for more stable support.

  A shaft-like pulling metal 7 is inserted into the bush 10 so as to be movable in the vertical direction. The pulling hardware 7 is formed such that the lower part has an outer diameter larger than that of the other part, and a step part 7a is formed on the outer peripheral surface by the lower part and the other part. The step part 7 a regulates the upward movement of the pulling hardware 7 by abutting against the step part 10 a of the bush 10.

  A locking groove 7b is formed on the entire outer periphery of the lower part of the pulling hardware 7, and the inner surface of the locking groove 7b is an arc in a cross section (longitudinal section) passing through the central axis of the pulling metal 7. . The groove depth of the locking groove 7 b is smaller than the radius of the ball 9. The radius of the circular arc in the longitudinal section of the inner surface of the locking groove 7 b is slightly larger than the radius of the ball 9. For this reason, when the ball 9 is fitted in the locking groove 7b, the ball 9 and the groove inner surface of the locking groove 7b are in point contact. The engaging groove 7b of the pulling hardware 7 may have a cross-sectional shape that can hold the pulling metal 7 against the urging force of the spring member 8 when the ball 9 is fitted therein.

  Further, a screw hole is formed in the vertical direction at the center of the lower end surface of the pulling metal 7, and a screw thread formed at the other end of the valve rod 5 is tightened into the screw hole, so that the valve rod 5 is attached to the pulling metal 7. Retained. The upper part of the pull-up metal 7 protrudes from the opening on the upper end side of the bush 10, and the handle 21 is fixed to the projecting end part so as to rotate integrally with the pull-up metal 7.

  A sleeve 11 is fitted on the outer periphery of the bush 10 so as to be movable in the vertical direction. The sleeve 11 is disposed in the large-diameter portion 18 of the valve stem support metal 6, and a groove 22 having a square cross section is formed on the entire circumference on the inner circumferential surface. In the groove 22, the lower groove side surface 22 a is an inclined surface downward from the radially outer side to the inner side. The groove depth of the groove 22 is formed smaller than the radius of the ball 9.

  Between the sleeve 11 and the flange 10b of the bush 10, an inner spring member 12 that is a coil spring is mounted around the bush 10 in a compressed state. The sleeve 11 is biased upward by the elastic restoring force of the inner spring member 12.

  A disc-shaped spring receiver 23 is arranged between the valve stem support metal 6 and the valve box 3. The valve stem 5 penetrates through the spring receiver 23 in the center, and moves up and down integrally with the valve stem 5 by a key (not shown). A guide portion 23 a that protrudes toward the column 16 and has a recess along the outer surface of the column 16 is formed on the outer periphery of the spring receiver 23. The valve stem 5 cannot be rotated by the guide portion 23a and the key.

  A spring member 8 that is a coil spring is mounted around the valve stem 5 in a compressed state between the valve stem support metal 6 and the spring receiver 23. Due to the elastic restoring force of the spring member 8, the valve stem 5 is biased downward via the spring receiver 23. The spring member 8 protects the inner spring member 12 and the bush 10 disposed on the inside thereof.

  A support plate 24 is fixed to the end surface of the operating shaft holding portion 19 of the valve stem support metal 6 (see FIG. 2). As shown in FIG. 3, the support plate 24 has a support plate 24 a that rotatably supports the operating shaft 13 in the operating shaft holding portion 19 and a holding plate 24 b that holds the air cylinder 25 at right angles to each other. Is integrated.

  As shown in FIG. 1, the support plate 24 a of the support plate 24 has a through hole 24 c of the operating shaft 13, and is fixed to the end surface of the operating shaft holding portion 19 of the valve rod support metal 6 with bolts. The operating shaft 13 is rotatably supported by the peripheral edge portion of the through hole 24c, and the central axis of the operating shaft 13 and the central axis of the operating shaft holding portion 19 are in a state of matching.

  The operating shaft 13 has a circular cross section, and has an axial projection 13a at the end on the bush 10 side. The protrusion 13a is formed by cutting out the four divided portions obtained by dividing the end portion of the operating shaft 13 into four by two orthogonal diameters except for one divided portion. That is, the protrusion 13 a is formed so that the cross-sectional shape thereof is a sector having a 90 degree, and the arc surface thereof is continuous with the outer peripheral surface of the operating shaft 13.

  The operating shaft 13 has a lever 26 attached to the end opposite to the protrusion 13a. As shown in FIG. 3, the lever 26 is disposed orthogonally and horizontally with respect to the operating shaft 13 in a normal state. As shown in FIG. 4B, the protrusion 13a has an outer peripheral surface including an arcuate surface, and one flat surface 13b is opposed to the upper end surface of the sleeve 11, and the other flat surface 13c is opposed to the lever 26. The lever 26 faces the front end side.

  As shown in FIG. 3, the air cylinder 25 is held by the holding plate 24 b of the support plate 24. The air cylinder 25 is connected to a compressor (not shown) that supplies compressed air via a hose (not shown), and the rod 25a is pushed out by the supply of compressed air.

  As shown in FIG. 3, the rod 25 a is disposed below the lever 26, and when pushed out from the air cylinder 25, the rod 25 a hits the lever 26 and rotates the lever 26. The operating shaft 13 is rotated by the rotation of the lever 26, and the protrusion 13a presses the sleeve 11 to move downward (see FIG. 5B). The sleeve 11 that has moved downward has its groove 22 facing the pocket 10 c of the bush 10.

The emergency shut-off valve 1 of the first embodiment is configured as described above, and the operation thereof will be described below with reference to the drawings.
Normally, as shown in FIG. 1, the valve body 4 is separated from the valve seat 2, the ball 9 is fitted in the locking groove 7 b of the pulling metal 7 that holds the valve stem 5, and the pulling metal 7 is fitted to the ball 9. The locked state is maintained. At this time, fuel oil flows through the flow path in the valve box 3, and compressed air is not supplied from the compressor into the air cylinder 25, and the rod 25 a is separated from the lever 26. It is in the state.

  In a state in which the pulling hardware 7 is locked to the ball 9 at normal times, the pulling metal 7 is supported by a plurality of balls 9 at a plurality of positions in the circumferential direction at equal intervals. For this reason, even if the pulling metal 7 is biased downward via the valve stem 5 by the spring member 8, the outer peripheral surface of the pulling metal 7 does not hit the inner wall of the valve rod supporting metal 6, The rotational resistance of the pulling hardware 7 does not increase.

  In the event of an emergency such as a fire, when the emergency shut-off valve 1 needs to be closed urgently, the operator opens the compressor valve and supplies compressed air to the air cylinder 25. As a result, as shown by the one-dot chain line in FIG. 3, the rod 25 a is pushed out, and the operating shaft 13 rotates as the lever 26 rotates, and the protrusion 13 a presses the sleeve 11 to move downward. (FIGS. 5A and 5B).

  When the sleeve 11 moves downward, the groove 22 faces the pocket 10c of the bush 10 radially outward. At this time, since the pulling metal 7 is urged downward by the spring member 8 via the valve rod 5, the upper portion of the groove inner surface of the locking groove 7b presses the ball 9 outward in the radial direction, It moves into the groove 22 of the sleeve 11 and disengages from the locking groove 7b.

  When the ball 9 is disengaged from the locking groove 7b, the valve rod 5 urged downward by the spring member 8 is moved as shown in FIG. Closes.

  Next, after the emergency situation is resolved, the compressed air in the air cylinder 25 is discharged, the rod 25 a is drawn into the air cylinder 25, and the rod 25 a is released from the lever 26. In this state, when the operator rotates the handle 21 in one direction (for example, clockwise), the pulling metal 7 is rotated in a loosening direction with respect to the valve rod 5 and only the pulling metal 7 is moved upward.

  At this time, as shown in FIG. 5A, the ball 9 in the pocket 10c of the bush 10 is subjected to a radially inward force by the groove side surface 22a of the sleeve 11 biased upward, The ball 9 presses the outer peripheral portion of the pulling hardware 7 inward in the radial direction.

  Since the ball 9 is held so as to be able to roll within the pocket 10 c of the bush 10, the ball 9 rolls while making point contact with the outer peripheral portion of the pulling metal 7 as the pulling metal 7 rotates. For this reason, the rotational resistance of the pulling hardware 7 becomes small, and the handle 21 can be turned lightly.

  Subsequently, when the bundle 21 is rotated and only the pulling hardware 7 is moved upward, the locking groove 7b of the pulling metal 7 faces the pocket 10c of the bush 10 as shown in FIG. At this time, the ball 9 in the pocket 10 c is pressed against the groove side surface 22 a of the sleeve 11 biased upward, moves inward in the radial direction, and automatically fits in the locking groove 7 b of the pulling hardware 7. Maru.

  When the ball 9 is fitted in the locking groove 7 b of the pulling metal 7, the ball 9 is detached from the groove 22 of the sleeve 11, and the sleeve 11 moves upward. Then, the sleeve 11 presses the projection 13a of the operating shaft 13, and the operating shaft 13 is rotated to automatically return the lever 26 to the horizontal state.

  By automatically returning the lever 26 to the horizontal state, the operator knows that the ball 9 is fitted in the locking groove 7 b of the pulling metal 7 and the ball 9 is locked to the pulling metal 7. Stop rotating in the direction. Further, the pulling hardware 7 is configured such that the stepped portion 7 a abuts against the stepped portion 10 a of the bush 10 at a position where the ball 9 is fitted in the locking groove 7 b. For this reason, the upward movement of the pulling hardware 7 is restricted, and the handle 21 can be prevented from rotating in one direction.

  Subsequently, the operator rotates the handle 21 in the other direction (counterclockwise). As a result, the pulling hardware 7 rotates in the direction in which the valve stem 5 is tightened, and the valve stem 5 moves upward against the urging force of the spring member 8. When the valve stem 5 moves upward, the valve body 4 is separated from the valve seat 2 and the emergency shut-off valve 1 can be restored to a normally open state.

  Further, by rotating the handle 21 in one direction or the other direction in a normal state, the valve rod 5 can be moved up and down by rotating the pull-up metal 7 in a loosening direction or a tightening direction with respect to the valve rod 5. . Accordingly, the flow rate of the fuel oil flowing through the flow path of the valve box 3 can be adjusted by moving the valve body 4 closer to or away from the valve seat 2.

  An emergency shutoff valve according to a second embodiment of the present invention will be described with reference to FIGS. In the following description, differences from the first embodiment will be mainly described, the same reference numerals are given to the same conceivable components, and description thereof will be omitted.

In the emergency shut-off valve according to the second embodiment, as shown in FIG. 8, the lever 26 is operated by pulling up a wire 27 attached to the tip of the lever 26.
That is, as shown in FIG. 9A, the lever 26 is attached in a state where the tip end portion thereof is inclined downward (for example, 30 degrees) with respect to the operating shaft 13, and the wire 27 is attached to the tip portion thereof. It has been.

  The wire 27 attached to the tip of the lever 26 is guided on a deck, for example, by a guide tube (not shown). Normally, the lever 26 is in a state in which the tip end portion is inclined downward, and the fuel oil flows through the flow path in the valve box 3.

  In the event of an emergency such as a fire, when the emergency shut-off valve 1 needs to be urgently closed, the wire 27 is pulled and, as shown in FIG. Thus, the operating shaft 13 rotates, and the protrusion 13a presses the sleeve 11 to move downward.

  When the sleeve 11 moves downward, as in the case of the first embodiment, the ball 9 moves into the groove 22 of the sleeve 11, disengages from the locking groove 7 b and is urged downward by the spring member 8. The rod 5 moves, the valve body 4 is seated on the valve seat 2, and the emergency shut-off valve 1 is closed.

  Next, after the emergency situation is resolved, the tension applied to the wire 27 is removed, and in this state, the operator rotates the handle 21 in one direction (for example, clockwise), so that only the pulling hardware 7 is removed. Move upward.

  Subsequently, when the bundle 21 is rotated and only the pulling hardware 7 is moved upward, the ball 9 in the pocket 10c moves inward in the radial direction and automatically fits in the locking groove 7b of the pulling metal 7. Maru.

  When the ball 9 is fitted into the locking groove 7b of the pulling metal 7, the ball 9 is removed from the groove 22 of the sleeve 11, the sleeve 11 moves upward, and the protrusion 13a of the operating shaft 13 is pressed, so that the operating shaft 13 is moved. Rotate. Thereafter, the lever 26 is manually returned to the normal position.

  The protrusion 13a of the operating shaft 13 has the other flat surface 13c of the outer peripheral surface orthogonal to the horizontal surface and facing the wire 27 side. For this reason, even when a downward load is applied to the distal end portion of the lever 26 due to an external factor in a normal state, the sleeve 11 is not pushed down by the protruding portion 13a, and malfunction can be prevented. it can.

  An emergency shutoff valve according to a third embodiment of the present invention will be described with reference to FIGS. In the following description, differences from the first embodiment will be mainly described, the same reference numerals are given to the same conceivable components, and description thereof will be omitted.

  The pull-up metal 7 of the emergency shut-off valve of the third embodiment has a cylindrical portion 7c having a small diameter at the lower portion thereof, and the upper ring 28, the ball receiving ring 29 and the lower ring 30 can be rotated relative to each other in the cylindrical portion 7c. These are inserted and secured by a cap nut 31 screwed to the lower end of the cylindrical portion 7c.

  The upper ring 28, the ball receiving ring 29, the lower ring 30, and the cap nut 31 are formed to have the same outer diameter as the portion other than the cylindrical portion 7c in the lower portion of the pulling hardware 7 (see FIG. 11). A ball receiving ring 29 is disposed between the upper ring 28 and the lower ring 30, and the ball receiving ring 29 is formed with the locking groove 7 b into which the ball 9 is fitted on the entire circumference.

  In this embodiment, the upper ring 28, the ball receiving ring 29 and the lower ring 30 move up and down integrally with the pulling metal 7 as the pulling metal 7 moves up and down, and the ball receiving ring 29 moves relative to the pulling metal 7. And is rotatably inserted. For this reason, when the pulling hardware 7 is rotated by the rotation of the handle 21 while the ball 9 is fitted in the locking groove 7b of the ball receiving ring 29, the ball receiving ring 29 does not rotate.

DESCRIPTION OF SYMBOLS 1 Emergency shut-off valve 2 Valve seat 3 Valve box 3a Bulkhead 3b Opening part 4 Valve body 5 Valve stick 6 Valve stick support metal 6a Fixing part 7 Pull-up metal 7a Step part 7b Locking groove 7c Cylindrical part 8 Spring member 9 Ball 10 Bush 10a Stepped portion 10b Flange 10c Pocket 11 Sleeve 12 Inner spring member 13 Actuation shaft 13a Projection portion 13b Plane 13c Plane 14 Cover member 14a Through hole 15 Packing 16 Strut 17 Small diameter portion 18 Large diameter portion 19 Actuation shaft holding portion 21 Handle 22 Groove 22a Groove Side 23 Spring receiver 23a Guide portion 24 Support plate 24a Support plate 24b Holding plate 25 Air cylinder 25a Rod 26 Lever 27 Wire 28 Upper ring 29 Ball receiving ring 30 Lower ring 31 Cap nut 70 Valve box 71 Flow path 72 Valve seat 73 Valve rod Support metal 73a Groove 74 Handle 75 Pull-up metal 75a Groove 76 Valve 77 the valve body 78 the spring receiving 79 the spring member 80 operating shaft 81 through holes 82 lever 83 fuse socket 84 rod 85 small lever

Claims (2)

A valve box having a valve seat, a valve stem support metal fixed above the valve box, a bush fixed in the valve bar support metal, and a pulling up that is movably inserted in the bush vertically A metal fitting, a valve rod having a valve body and held by screw connection to the pulling metal fitting, a spring member for biasing the valve rod downward, and an outer peripheral portion of the bush are fitted to be movable in the vertical direction. A sleeve, an inner spring member that urges the sleeve upward, and an operating shaft that is rotatably held by the valve stem support metal,
The bush has a plurality of pockets for holding the ball so as to be able to roll at equal intervals in the circumferential direction, the pulling metal rotates integrally with the handle, and the locking groove into which the ball fits is formed on the outer periphery of the pulling metal. A groove is formed on the inner periphery of the sleeve, and the operating shaft has a protrusion that presses the sleeve downward by rotation;
When the pulling metal moves upward and the locking groove faces the pocket of the bush, the ball in the pocket of the bush fits into the locking groove, and the pulling metal is held in the locked state by the ball. When the operating shaft rotates and the groove of the sleeve, which moves downward by the protrusion, faces the pocket of the bush, the ball moves toward the groove and disengages from the locking groove of the pulling hardware. The emergency shutoff valve is configured such that the valve stem moves downward and the valve element is seated on the valve seat to be closed.   The emergency shut-off valve according to claim 1, wherein an inner surface of the groove on the lower side of the bush is formed as an inclined surface radially inward toward the lower side.

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