Opening / Closing Handle Fixture for Ball Valve

Abstract

Provided is an opening / closing handle fixture for a ball valve that can be attached to an existing ball valve with simple operations and can ensure security. 【Solution means】The opening / closing handle fixture 15 of the first embodiment includes a first plate 16 that prevents rotation of the opening / closing handle 11, and a second plate 17 that is slidably attached to the first plate 16 and holds the positional relationship between the opening / closing handle 11 and the first plate 16. The first plate 16 is provided with first locking holes 20, 21 through which a lock latch is inserted, and clamping portions 22, 23 that clamp the opening / closing handle 11 and a stopper 12 of the valve body 2 that restricts rotation of the opening / closing handle 11. The second plate 17 is provided with second locking holes 30, 31 through which the lock latch is inserted, and an insertion portion 33 that is inserted into the gap between the opening / closing handle 11 and the first plate 16. The first plate 16 prevents rotation of the opening / closing handle 11, and when the second plate 17 is slid and the insertion portion 33 is inserted into the gap, the first locking hole 20 and the second locking hole 30, and the first locking hole 21 and the second locking hole 31 are arranged so as to overlap.

Description

Technical Field

[0001] The present invention relates to a fixing device for an opening / closing handle of a ball valve, which is mounted on a ball valve having an opening / closing handle operated manually, can prevent accidental misoperation or unauthorized operation, and can be equipped with a lock for ensuring the security of the ball valve.

Background Art

[0002] Conventionally, as structures for locking the opening / closing handle of a ball valve, for example, a lock structure for a rotary valve disclosed in Patent Document 1 below and a ball valve with a locking mechanism disclosed in Patent Document 2 are known. The lock structure of Patent Document 1 includes a stopper provided outside the valve body, a lock member formed with an engaging portion that engages with the outer surface of the stopper when the valve body is fully opened or fully closed, and a spring that biases the lock member in the engaging direction with the stopper. Further, the ball valve of Patent Document 2 includes a locking mechanism by a locking screw provided on the valve body side within the rotation range of the handle.

[0003] According to the lock structure of Patent Document 1, the positions of the stoppers are different for full opening and full closing, and a special body is required for full closing. Further, according to the ball valve of Patent Document 2, a locking screw is pre-attached to the valve body side, and a dedicated valve body is required. Therefore, both structures have the problem that they cannot be used for existing standard valves. Also, both structures can lock the rotational movement of the handle, but there is a problem that a lock for ensuring security cannot be attached. Note that Patent Document 1 describes that it can be applied only by replacing the handle for an existing rotary valve having a stopper. However, since a disassembling operation is required to replace the handle, it takes time and is troublesome to attach the lock member.

[0004] Also, as a structure for locking the opening / closing handle of a ball valve, for example, a valve handle fixing fixture disclosed in Patent Document 3 is known. The fixing fixture of Patent Document 3 includes a U-shaped main body that fits on opposite side surfaces of a valve box, and a contact plate that extends from the main body in the handle direction and contacts the side surface of the handle on the front side in the valve opening direction. Since this fixing fixture has a structure in which the U-shaped main body is fitted to the side surface of the valve box and the rotation of the handle is blocked by the contact plate, it can be fitted to an existing standard valve and used, and no disassembly work of the handle is required during installation. However, if the handle is turned forcibly, a force that attempts to rotate around the axis of the handle is applied, causing the U-shaped main body of the fixing fixture to twist, and the springy contact plate to bend. If it is in the fully open state, even if the fixing fixture moves slightly, the influence is small, but when it is fully closed, if the valve opening degree opens even slightly due to the bending, there is a problem that fluid will flow. Also, although a string can be passed through the hole of the fixing fixture and tied to the valve or piping, there is a problem that a lock for ensuring security cannot be attached.

[0005] Note that, as a structure that enables a lock to be attached to the opening / closing handle of a ball valve, for example, a valve with a locking mechanism disclosed in Patent Document 4 is known. The valve of Patent Document 4 includes a locking mechanism composed of a lock plate in which an unlocking keyhole and a locking keyhole are formed, and a handle in which keyholes corresponding to the respective keyholes of the lock plate are formed. However, according to this valve, when providing a locking mechanism, a disassembling operation for replacing the handle with keyholes formed therein is required. Further, if there is a clearance between the shackle of a padlock and the keyhole, there is a problem that the valve opening degree is slightly opened at full close and fluid flows through. Moreover, the shackle of the padlock must be inserted into the corresponding keyholes of both the lock plate and the handle in a state where the two plates are overlapped, and if it cannot be inserted up to the curved portion of the shackle, it becomes difficult to perform the locking and unlocking operations. If the keyhole is enlarged, it becomes easier to insert the shackle, but if the clearance between the shackle and the handle increases, the movable range of the handle will widen. Therefore, it is desirable that the clearance between the keyhole and the shackle be as narrow as possible, and there are severe restrictions on the size of the padlock, and there is a problem that the user cannot freely select and use the type of padlock.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0007] The present invention has been made to solve the above problems, and an object thereof is to provide an opening / closing handle fixture for a ball valve that can be attached to an existing ball valve with simple operations and can ensure security.

Means for Solving the Problems

[0008] To solve the above problems, an opening / closing handle fixture for a ball valve according to the present invention is an opening / closing handle fixture for fixing an opening / closing handle of a ball valve, and includes a first plate that prevents rotation of the opening / closing handle, and a second plate that is slidably attached to the first plate and holds the positional relationship between the opening / closing handle and the first plate. The first plate is provided with a first locking hole through which a locking pin of a lock is inserted, and a clamping portion that clamps the opening / closing handle and a stopper of a valve body that restricts rotation of the opening / closing handle. The second plate is provided with a second locking hole through which a locking pin of a lock is inserted, and an insertion portion that is inserted into a gap between the opening / closing handle and the first plate. The first plate prevents rotation of the opening / closing handle, and when the second plate is slid and the insertion portion is inserted into the gap, the first locking hole and the second locking hole are arranged to overlap.

[0009] Further, in the opening / closing handle fixture for a ball valve according to the present invention, the first plate has a guide piece extending in the horizontal direction, the second plate has a slide piece extending in the horizontal direction, and the slide piece attached to the guide piece may be configured to move parallel along a slit provided in the slide piece.

[0010] Further, in the opening / closing handle fixture for a ball valve according to the present invention, the first plate has a guide piece extending in the horizontal direction, the second plate has a slide piece extending in the horizontal direction, and the slide piece attached to the guide piece may be configured to rotate about a screw as a fulcrum.

[0011] Further, in the opening / closing handle fixture of the ball valve according to the present invention, a slope portion provided with an inclined surface for guiding the sliding direction of the second plate may be provided on the first plate.

Effect of the Invention

[0012] According to the opening / closing handle fixture of the ball valve according to the present invention, it can be attached to the opening / closing handle with a simple operation without disassembling the existing ball valve, and it can also correspond to both the lock at full open and the lock at full close. Further, there is an effect that locks of different sizes and types can be selected and attached.

Brief Description of the Drawings

[0013]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[0015] The ball valve to which the opening / closing handle fixture of the ball valve of the present invention (hereinafter, simply referred to as "opening / closing handle fixture") is attached is a manual valve that can switch the internal fluid passage through which the fluid passes to fully open or fully closed by manually operating the opening / closing handle for the fluid handled in various fields such as semiconductors, food, and medical.

[0016] As shown in FIG. 1, in the ball valve 1, a fluid passage 5 through which the fluid flows and communicates from the inflow port 3 to the outflow port 4 is formed in the pipe of the metal valve body 2. Inside the valve body 2, a valve body composed of a metal ball 6 and a stem 7 connected to the upper part of the ball 6 is incorporated. A flow path hole 8 that communicates with the fluid passage 5 at full open is formed through the center of the ball 6. An opening / closing handle 11 is provided on a plate-like handle body 10 that is rotatably supported by the stem 7 and tightened and fixed with a nut 9 on the upper part of the valve body 2, and a protruding stopper 12 that restricts the rotation of the opening / closing handle 11 is provided. Connecting flanges 13 are provided at both ends of the valve body 2, and bolt holes 14 for connecting joints, manifolds, etc. with bolts are formed at the four corners of the flanges 13.

[0017] As shown in Fig. 1(A), when the opening / closing handle 11 is operated to rotate counterclockwise by 90°, the handle body 10 collides with the side surface of the stopper 12, and the rotation of the opening / closing handle 11 is restricted. At this time, the ball 6 connected to the stem 7 rotates counterclockwise by 90° in conjunction, and the flow path hole 8 of the ball 6 communicates with the fluid passage 5. As a result, the fluid flowing in from the inflow port 3 flows out from the outflow port 4 through the fluid passage 5 and the flow path hole 8. This is the state of the ball valve 1 when it is fully open.

[0018] On the contrary, as shown in Fig. 1(B), when the opening / closing handle 11 is operated to rotate clockwise by 90°, the handle body 10 collides with the front surface of the stopper 12, and the rotation of the opening / closing handle 11 is restricted. At this time, the ball 6 connected to the stem 7 rotates clockwise by 90° in conjunction, and the flow path hole 8 of the ball 6 is orthogonal to the fluid passage 5. As a result, the fluid flowing in from the inflow port 3 is blocked by the ball 6 in the middle of the fluid passage 5. This is the state of the ball valve 1 when it is fully closed.

[0019] As shown in Fig. 2, the opening / closing handle fixture 15 of the first embodiment fixes the opening / closing handle 11 shown in Fig. 1 and has a locking function of preventing the rotation of the opening / closing handle 11 due to inadvertent incorrect operation or unauthorized operation when it is fully closed. The opening / closing handle fixture 15 includes a first plate 16 that prevents the rotation of the opening / closing handle 11, a second plate 17 that maintains the positional relationship between the opening / closing handle 11 and the first plate 16, and a screw 18 that connects both plates.

[0020] The first plate 16 is made of a metal plate processed (blanked and bent) into a predetermined shape, and circular first locking holes 20 and 21 for inserting the locking device of the lock are formed through both the left and right sides of the first sheet metal part 19 that extends in the vertical direction. At the lower end of the first sheet metal part 19, a pair of clamping parts 22 and 23 notched to a predetermined length L1 (the length obtained by combining the width of the handle body 10 and the thickness of the stopper 12) are provided. Further, on the guide piece 24 that extends horizontally from the first sheet metal part 19, two female screw holes 25 and 26 for inserting the screw 18 and two slope parts 27 and 28 having inclined surfaces for guiding the sliding direction of the second plate 17 are provided.

[0021] The second plate 17 is made of a metal plate processed (blanked and bent) into a predetermined shape, and circular second locking holes 30 and 31 having the same size as the first locking holes 20 and 21 corresponding to the first plate 16 are formed through both the left and right sides of the second sheet metal part 29 that extends in the vertical direction. Further, on the slide piece 32 that extends horizontally from the second sheet metal part 29, an insertion part 33 to be inserted into the gap between the bottom surface of the handle body 10 and the guide piece 24 and a slit 34 formed through in the longitudinal direction are provided.

[0022] The first plate 16 and the second plate 17 are integrated by the screw 18. After passing the screw 18 fitted in the slit 34 through the female screw hole 25 on the left side and then performing swaging on the thread 35, the first plate 16 and the second plate 17 are connected without coming off. Also, a clearance is provided between the first plate 16 and the second plate 17, and the first plate 16 attached by the screw 18 moves parallel along the slit 34, so that the second plate 17 is slidably attached to the first plate 16 in the lateral direction (right side in this embodiment). Note that by tightening the screw 18 in the screw groove of the female screw hole 25, it is possible to fix the first plate 16 and the second plate 17, and it also has a function of temporarily fixing the first plate 16 and the second plate 17 so that they do not slide before attaching the lock opening / closing handle fixture 15 to the valve body 2 and mounting the lock.

[0023] When attaching the opening / closing handle fixture 15 of the first embodiment to the ball valve 1, the procedure shown in FIG. 3 is followed. First, as shown in FIG. 3(A), with the opening / closing handle fixture 15 in a state where the first plate 16 and the second plate 17 are slid and expanded to the maximum width, it is placed over the opening / closing handle 11 of the fully closed ball valve 1 in a direction perpendicular thereto. As a result, as shown in FIG. 3(B), the first plate 16 is fitted and fixed to the opening / closing handle 11.

[0024] Here, as shown in FIG. 4, when looking at the ball valve 1 from above, when the opening / closing handle fixture 15 is not attached, the opening / closing handle 11 can rotate counterclockwise, so the valve can be opened due to misoperation or unauthorized operation. However, when the opening / closing handle fixture 15 is attached, as shown enlarged in FIG. 4, the clamping portion 22 on the left side of the first plate 16 abuts against the back surface of the stopper 12, and the clamping portion 23 on the right side abuts against the side surface of the handle body 10. Since the pair of clamping portions 22, 23 are formed by metal notches with a fixed length, they do not bend and can regulate with little play. For this reason, the stopper 12 and the handle body 10 are sandwiched between the pair of clamping portions 22, 23 and the movement of the opening / closing handle 11 is regulated, so the rotation of the opening / closing handle 11 can be reliably locked and there is no risk of fluid flowing out from the outflow port 4 when fully closed.

[0025] Next, as shown in FIG. 3(B), the second plate 17 is slid in the direction of the opening / closing handle on the right side of the figure to reduce the width of the opening / closing handle fixture 15. As a result, as shown in FIG. 3(C), the insertion portion 33 of the slide piece 32 overlaps the guide piece 24, and the positional relationship between the opening / closing handle 11 and the first plate 16 is maintained.

[0026] Here, as shown in FIG. 5, when the ball valve 1 is viewed from the front, there is a gap for one plate provided between the guide piece 24 and the handle body 10. Therefore, when the second plate 17 is slid, the insertion portion 33 is inserted into this gap, and the insertion portion 33 is overlapped and held on the guide piece 24. At this time, as long as the insertion portion 33 overlaps the guide piece 24 even slightly, the second plate 17 will not come off. Moreover, a slope portion 28 is provided on the right side of the guide piece 24 so that the insertion portion 33 does not accidentally slip under the first plate 16. For this reason, since the insertion portion 33 is guided onto the guide piece 24 along the inclined surface of the slope portion 28, the second plate 17 can be slid and installed at the correct position between the first plate 16 and the opening / closing handle 11.

[0027] Finally, as shown in FIG. 6, a lock (a padlock 36 in this embodiment) is installed on the opening / closing handle fixture 15 attached to the ball valve 1. When the rotation of the opening / closing handle 11 is blocked by the first plate 16 and the insertion portion 33 is inserted into the gap by sliding the second plate 17, the first locking hole 20 and the second locking hole 30, and the first locking hole 21 and the second locking hole 31 are arranged so as to overlap each other. Therefore, it becomes possible to insert the shackle 37 of the padlock 36 into the two overlapping locking holes (the first locking hole 20 and the second locking hole 30, the first locking hole 21 and the second locking hole 31) and lock them. Accordingly, the opening / closing handle fixture 15 does not come off from the opening / closing handle 11, preventing persons other than the operator from operating the opening / closing handle 11 and ensuring the security of the ball valve 1.

[0028] In addition, since the opening and closing handle fixture 15 of the present embodiment is provided with a set of locking holes (first locking holes 20 and 21 and second locking holes 30 and 31) on both the left and right sides (upstream side and downstream side) sandwiching the opening and closing handle 11, it is possible to lock by locking any one set with a padlock 36. Further, threaded holes 25 and 26 and slope portions 27 and 28 are provided on both the left and right sides of the first plate 16. As shown in FIG. 2(B), if the second plate 17 having the insertion portions 33 formed in opposite directions is connected to the right threaded hole 26, the second plate 17 can also be slid to the opposite left side with respect to the first plate 16.

[0029] In the present embodiment, the inner diameters of the first locking holes 20 and 21 and the second locking holes 30 and 31 are set to φ8 mm, and a padlock 36 having a shackle 37 with a thickness close to φ8 mm is used. However, the thickness of the shackle 37 is not limited to this. As shown in FIG. 5, even when the first locking hole 20 and the second locking hole 30, and the first locking hole 21 and the second locking hole 31 are in a state of partially overlapping with a small diameter, as long as the insertion portion 33 overlaps at least slightly on the guide piece 24, the second plate 17 will not come off. Therefore, even if the thickness of the locking bar is a thin wire of about φ1 mm, it is possible to lock. Therefore, locking bars of various thicknesses can be used according to the security level. Regarding the type of lock, it is not limited to a cylinder-type padlock that is locked and unlocked with a key, and a dial-type or push-button type lock can be used as long as it can be locked and unlocked by passing it through a hole.

[0030] The above is the structure for locking the rotation of the opening and closing handle 11 to the fully open side. On the contrary, it is also possible to adopt a structure for locking the rotation of the opening and closing handle 11 to the fully closed side. As shown in FIG. 7, the opening and closing handle fixture 38 of the second embodiment fixes the opening and closing handle 11 shown in FIG. 1 and has a locking function for preventing the rotation of the opening and closing handle 11 due to accidental misoperation or unauthorized operation when fully open. The opening and closing handle fixture 38 includes a first plate 39 that prevents the rotation of the opening and closing handle 11, a second plate 40 that maintains the positional relationship between the opening and closing handle 11 and the first plate 39, and a screw 41 that connects both plates.

[0031] The first plate 39 is made of a metal plate processed (punched and bent) into a predetermined shape. In the first sheet metal part 42 having a U-shaped cross section, a pair of clamping parts 43, 44 with a predetermined length L2 (the combined length of the width of the handle body 10 and the width of the stopper 12) are provided. A circular first locking hole 46 for inserting the latch of the lock is formed through a guide piece 45 extending horizontally from the first sheet metal part 42, and one slope part 47 having an inclined surface for guiding the sliding direction of the second plate 40 is provided. At the end of the first sheet metal part 42, one tapped hole 48 for inserting the screw 41 is provided.

[0032] The second plate 40 is made of a metal plate processed (punched) into a predetermined shape. A circular second locking hole 50 having the same size as the first locking hole 46 is formed through a slide piece 49 extending in a horizontal plane L shape so as to correspond to the first plate 39. Further, the slide piece 49 is provided with an insertion part 51 inserted into the gap between the bottom surface of the handle body 10 and the guide piece 45, and one through hole 52 for inserting the screw 41.

[0033] The first plate 39 and the second plate 40 are integrated by the screw 41. After passing the screw 41 fitted in the through hole 52 through the tapped hole 48 and then performing upsetting processing on the thread 53, the first plate 39 and the second plate 40 are connected without coming off. In addition, a clearance is provided between the first plate 39 and the second plate 40, and the second plate 40 is slidably attached to the first plate 39 by rotating around the screw 41 as a fulcrum. Note that by tightening the screw 41 in the screw groove of the tapped hole 48, it is possible to fix the first plate 39 and the second plate 40, and it also has a function of temporarily fixing the first plate 39 and the second plate 40 so that they do not slide before attaching the lock by attaching the opening / closing handle fixture 38 to the valve body 2.

[0034] When attaching the opening / closing handle fixture 38 of the second embodiment to the ball valve 1, the procedure shown in FIG. 8 is followed. First, as shown in FIG. 8(A), the opening / closing handle fixture 38 in a state where the first plate 39 and the second plate 40 are slid and expanded at an angle of 90° is placed over the opening / closing handle 11 of the fully open ball valve 1 in a direction parallel to it from above. As a result, the first plate 39 is fitted and fixed to the opening / closing handle 11.

[0035] Here, when looking at the ball valve 1 from above as shown in FIG. 9, when the opening / closing handle fixture 38 is not attached, the opening / closing handle 11 can rotate clockwise, so the valve can be closed by accidental or unauthorized operation. However, when the opening / closing handle fixture 38 is attached, as shown enlarged in FIG. 9, the clamping portion 43 on the left side of the first plate 39 abuts against the side surface of the handle body 10, and the clamping portion 44 on the right side abuts against the side surface of the stopper 12. Since the pair of clamping portions 43, 44 are designed to have a predetermined length by bending a metal first sheet metal portion 42 into a U-shaped cross-section, it is possible to regulate with little play and hardly any deflection. For this reason, since the handle body 10 and the stopper 12 are clamped between the pair of clamping portions 43, 44 and the movement of the opening / closing handle 11 is restricted, the rotation of the opening / closing handle 11 can be reliably locked.

[0036] Next, as shown in FIG. 8(B), the second plate 40 is slid and rotated in the direction of the first plate 39 to reduce the angle of the opening / closing handle fixture 38. As a result, as shown in FIG. 8(C), the slide piece 49 overlaps the guide piece 45, and the positional relationship between the opening / closing handle 11 and the first plate 39 is maintained.

[0037] Here, as shown in FIG. 10, when the ball valve 1 is viewed from the side, there is a gap for one plate provided between the guide piece 45 and the handle body 10. Therefore, when the second plate 40 is slid, the insertion portion 51 is inserted into this gap, and the insertion portion 51 is overlapped and held on the guide piece 45. At this time, as long as the insertion portion 51 overlaps the guide piece 45 even slightly, the second plate 40 will not come off. Moreover, a slope portion 47 is provided on the guide piece 45 so that the insertion portion 51 does not accidentally slip under the first plate 39. For this reason, since the insertion portion 51 is guided onto the guide piece 45 along the inclined surface of the slope portion 47, the second plate 40 can be slid and installed at the correct position between the first plate 39 and the opening / closing handle 11.

[0038] Finally, as shown in FIG. 11, a lock (in this embodiment, a padlock 36) is installed on the opening / closing handle fixture 38 attached to the ball valve 1. When the rotation of the opening / closing handle 11 is blocked by the first plate 39 and the insertion portion 51 is inserted into the gap by sliding the second plate 40, the first locking hole 46 and the second locking hole 50 are arranged to overlap. Therefore, it is possible to insert the shackle 37 of the padlock 36 into the two overlapping locking holes (the first locking hole 46 and the second locking hole 50) and lock them. Thus, the opening / closing handle fixture 38 will not come off from the opening / closing handle 11, preventing unauthorized persons other than the operator from operating the opening / closing handle 11 and ensuring the security of the ball valve 1.

[0039] In this embodiment as well, as shown in FIG. 8(B), even when the first locking hole 46 and the second locking hole 50 are in a small-diameter state where they partially overlap, as long as the insertion portion 51 overlaps the guide piece 45 even slightly, the second plate 40 will not come off. Therefore, it is possible to lock even if the locking device is a thin wire.

[0040] As described above, according to the opening / closing handle fixture 15 of the first embodiment and the opening / closing handle fixture 38 of the second embodiment, even when the ball valve 1 is installed in a narrow space, the attachment and detachment operations can be easily performed. Since the space required in the height direction of the opening / closing handle fixtures 15 and 38 during the operation is suppressed to about 10 mm or less from the upper part of the opening / closing handle 11, the operation can be performed even when there is only a narrow space with a close wall above the ball valve 1. Further, even when there are space restrictions in any of the front-rear, left-right directions of the ball valve 1, the opening / closing handle fixture 15 of the first embodiment can select either the left or right sliding direction, and the opening / closing handle fixture 38 of the second embodiment can be slid and rotated within the width range of the valve body 2. Because of the compact design, it can flexibly respond to the working space.

Explanation of Signs

[0041] 1: Ball valve 2: Valve body 3: Inflow port 4: Outflow port 5: Fluid passage 6: Ball 7: Stem 8: Flow path hole 9: Nut 10: Handle body 11: Opening / closing handle 12: Stopper 13: Flange 14: Bolt hole 15: Opening / closing handle fixture of the first embodiment 16: First plate 17: Second plate 18: Screw 19: First sheet metal part 20: First locking hole 21: First locking hole 22: Clamping part 23: Clamping part 24: Guide piece 25: Female screw hole 26: Female screw hole 27: Slope part 28: Slope part 29: Second sheet metal part 30: Second locking hole 31: Second locking hole 32: Slide piece 33: Insertion part 34: Slit 35: Thread 36: Padlock 37: Shackle 38: Opening and closing handle fixture of the second embodiment 39: First plate 40: Second plate 41: Screw 42: First sheet metal part 43: Clamping part 44: Clamping part 45: Guide piece 46: First locking hole 47: Slope part 48: Female screw hole 49: Slide piece 50: Second locking hole 51: Insertion part 52: Through hole 53: Thread

Claims

1. An opening / closing handle fixing device for fixing an opening / closing handle of a ball valve, A first plate that prevents the opening / closing handle from rotating; a second plate slidably attached to the first plate and configured to maintain a positional relationship between the opening / closing handle and the first plate; The first plate is provided with a first locking hole through which a latch of a lock is inserted, and a clamping portion that clamps the opening / closing handle and a stopper of a valve body that restricts rotation of the opening / closing handle. The second plate is provided with a second locking hole through which a latch of a lock is inserted, and an insertion portion that is inserted into a gap between the opening / closing handle and the first plate, The first plate prevents the opening / closing handle from rotating, and the first locking hole and the second locking hole are arranged to overlap when the second plate is slid to insert the insertion portion into the gap.

1. A ball valve opening / closing handle fixing device.

2. The first plate has a guide piece extending in a horizontal direction, and the second plate has a slide piece extending in a horizontal direction, The slide piece attached to the guide piece is configured to move in parallel along a slit provided in the slide piece.

2. The ball valve opening / closing handle fixing device according to claim 1.

3. The first plate has a guide piece extending in a horizontal direction, and the second plate has a slide piece extending in a horizontal direction, The slide piece attached to the guide piece is configured to rotate around a screw as a fulcrum.

2. The ball valve opening / closing handle fixing device according to claim 1.

4. The first plate is provided with a slope portion having an inclined surface that guides the sliding direction of the second plate.

2. The ball valve opening / closing handle fixing device according to claim 1.

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