JP2010019335A - Valve reinforcing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve reinforcing device capable of smoothly performing the opening/closing operation of a valve by reinforcing a yoke and a gland presser of a yoke type valve even in a repairing difficult place. <P>SOLUTION: A baseplate 24 is fixed to a pipe 15 on the valve element side more than the yoke 23 of a yoke type. A stand 25 is erected on the baseplate 24 to cover the yoke 23 by penetrating a valve rod 14 projected from the yoke 23. A screw body 26 having a female screw which is screwed to a male screw of the valve rod 14 and operated by a handle 16 is arranged in a part where the valve rod 14 penetrates the stand 25. A gland presser holding part 28 for holding the gland presser 20 is arranged in an upper part of the gland presser 20, and the gland presser holding part 28 is fixed to the baseplate 24 by straddling the gland presser 20 with a vertical bolt 29. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a valve reinforcing device that reinforces a yoke or a ground presser of a yoke type valve.

  Normally, a pipe for flowing a fluid such as liquid or high-pressure gas is provided with a valve, and the supply destination of the fluid is changed or the supply of the fluid is stopped by opening and closing the valve. For example, the LNG facility is configured to supply LNG from a LNG storage tank that stores LNG (liquefied natural gas) to a LNG consumption facility through a plurality of lines of piping.

  The yoke type valve used in the LNG facility has a long neck yoke type valve that has a long gap between the handle that operates the valve stem and the valve box that houses the valve element, and a short neck that has a short gap between the handle and the valve box. There is a yoke type valve. The long neck yoke type valve is for low temperature, and the short neck yoke type valve is for room temperature.

  6 is a front view of an example of a long neck yoke valve, and FIG. 7 is a cross-sectional view taken along the line AA of FIG. The long neck yoke type valve 11 cannot perform at a low temperature when the gland packing 18 to be described later is at a low temperature. Therefore, for the purpose of keeping the vicinity of the gland packing 18 at a normal temperature, heat radiation for radiating cold heat to the pipe 15 that penetrates the valve stem 14 is performed. A plate 17 is provided, and a cold insulating material is disposed below the heat radiating plate 17 so as to wrap the valve box 13. That is, the pipe 15 is pulled out from the valve box 13 in which the valve body 12 is accommodated, and the valve rod 14 is inserted into the pipe 15. A valve body 12 is connected to one end of the valve stem 14, and a handle 16 for operating the valve stem 14 to open and close the valve is attached to the other end.

  A gland packing 18 for maintaining the sealing performance of the valve stem 14 is provided in the packing box 19, and the gland packing 18 is pressed by a gland presser 20 so that the sealing performance of the valve stem 14 is maintained. The gland retainer 20 is fixed to the packing box 19 by being fastened by a nut 22 to an eye bolt 21 provided on a yoke 23 at the upper part of the packing box 19. Thereby, the ground presser 20 is pressed by the eyebolt 21 and the nut 22. In this case, the load is applied to the yoke 23.

  A yoke 23 provided on the upper portion of the packing box 19 holds the valve rod 14 protruding from the packing box 19, and the male screw formed on the protruding valve rod 14 and the female screw of the yoke 23 are screwed together. Then, the valve stem 14 is held. That is, when the handle 16 is operated in the valve closing direction, pressure is applied to the valve stem 14 upward from the valve body 12 at the tip. The pressure applied to the valve stem 14 is applied to the yoke 23 by screwing between the male screw of the valve stem 14 and the female screw of the yoke 23.

  Since the yoke type valve 11 used in such an LNG facility is equipped with a product having a specification suitable for the design, no special trouble has occurred in appearance or function so far.

  Here, as a yoke type valve, there is one having a structure in which a packing presser is divided into a plurality of parts so that the gland packing can be exchanged so as to be removable from the valve rod (see, for example, Patent Document 1).

  Further, as a valve repair jig, there is one that can repair an open / close valve that does not have a groove in a valve rod of a yoke type valve without taking much labor and time (for example, see Patent Document 2). ). This is because the support body is attached to the open / close valve so as to surround the operation part of the open / close valve, and the first shaft member, which is attached to the support body and is arranged coaxially with the valve stem of the open / close valve, contacts the tip of the valve stem. The movement of the valve stem is in contact with it, the second shaft member is brought into contact with the side surface of the packing retainer fitted to the valve stem to restrict the movement of the packing retainer, and the packing is attached to the valve stem extending from the packing retainer. The movement of the packing presser is regulated by abutting against the presser, and the plate member attached to the valve stem extending from the packing presser is fixed to the opening / closing valve via the support body to restrict the movement of the valve stem. The yoke is replaced and repaired.

  Recently, it has been found that the yoke 23 of the yoke-type valve 11 has undergone an event that causes deterioration due to aging, a local pressure increase in the pipe, or the like, or thinning due to corrosion. If the yoke 23 is cracked or thinned, the valve stem cannot be held and the closing operation becomes difficult, and when the crack of the portion to which the eyebolt 21 of the yoke 23 is attached progresses, the gland retainer 20 of the yoke valve 11 It may be dropped. If the gland retainer 20 falls off, there is a risk that LNG will eventually leak out from the gland packing 18, so an early countermeasure is necessary.

  In this case, it is possible to replace the yoke by using the valve repair jig of Patent Document 2, but the repair work is limited depending on the situation around the piping of the LNG facility, for example, the condition of the fluid flowing through the piping. There is a case. In order to replace the part of the yoke type valve 11 or itself, depending on the location of the yoke type valve, the LNG facility itself must be stopped.

  Therefore, the applicant has developed a valve reinforcing device and method that can reinforce the yoke of the yoke valve and the gland press even in places where repair is difficult, and has filed an application as Japanese Patent Application No. 2007-285365. This is because the base plate is attached to the pipe on the valve element side from the yoke, the valve stem holding the valve stem with the female thread that engages with the male screw of the valve stem is placed on the handle side of the yoke, and the valve stem presser straddling the yoke Is fixed to the base plate with a bolt, and the gland holding part is fixed to the base plate with a vertical bolt.

As a result, the load on the valve stem is held by the valve stem presser fixed to the base plate, so that no load is applied to the yoke, and the valve stem is screwed with the valve stem presser and screw so that the valve can be opened and closed. The handle can be operated and the yoke can be reinforced without impairing the function of the yoke type valve.
Japanese Unexamined Patent Publication No. 7-248065 Japanese Patent Laying-Open No. 2005-288656

  However, in order to smoothly open and close the valve, it is necessary to ensure the torsional rigidity associated with the opening and closing operation of the valve. Further, in the previous application by the applicant, the valve stem is held by providing a valve stem presser having a female screw that is screwed with the male screw of the valve stem. And the holding force of the valve stem by the yoke may interfere with each other, and the valve opening / closing operation may not be performed smoothly.

  An object of the present invention is to provide a valve reinforcing device that can reinforce the yoke of the yoke-type valve and the gland press even at places where repair is difficult, and that can smoothly open and close the valve.

  The valve reinforcing device according to the invention of claim 1 is connected to a pipe that houses a valve body in a valve box that houses a valve body, and from the pipe through a gland press that holds a gland packing for maintaining the sealing performance of the valve stem. The valve stem is protruded, the male screw of the protruded valve stem and the female screw of the yoke are screwed together to hold the valve stem, and the valve stem is operated with the handle on the opposite side of the valve body with the yoke interposed therebetween. A base plate provided on the yoke-type valve, fixed to the pipe on the valve body side from the yoke, and a stand erected on the base plate so as to cover the yoke through the valve rod protruding from the yoke; The valve stem is provided at a portion passing through the stand, and has a screw body that has a female screw threadedly engaged with a male screw of the valve stem and is operated by the handle.

  The valve reinforcing device according to the invention of claim 2 is configured such that a pipe for housing a valve stem is connected to a valve box housing a valve body, and is connected to the pipe through a gland presser for holding a gland packing for maintaining the sealing performance of the valve stem. The valve stem is protruded, the male screw of the protruded valve stem and the female screw of the yoke are screwed together to hold the valve stem, and the valve stem is operated with the handle on the opposite side of the valve body with the yoke interposed therebetween. A base plate provided on the yoke-type valve, fixed to the pipe on the valve body side from the yoke, and a stand erected on the base plate so as to cover the yoke through the valve rod protruding from the yoke; The valve stem is provided in a portion that penetrates the stand, has a female screw that is screwed with a male screw of the valve stem, and is operated by the handle. And ground presser holder for vignetting holding the ground presser, characterized in that said ground presser holder across the ground pressing and a vertical bolt to be fixed to the base plate.

  According to a third aspect of the present invention, there is provided a valve reinforcing device in which a pipe for housing a valve stem is connected to a valve box that houses a valve body, and is connected to the pipe through a gland press for holding a gland packing for maintaining the sealing performance of the valve stem. The valve stem is protruded, the male screw of the protruded valve stem and the female screw of the yoke are screwed together to hold the valve stem, and the valve stem is operated with the handle on the opposite side of the valve body with the yoke interposed therebetween. A base plate provided on the yoke type valve, fixed to the pipe on the valve element side from the yoke, an extension shaft connected to the valve stem protruding from the yoke, and extending through the extension shaft. The stand is erected on the base plate so as to cover the yoke, and the extension shaft is provided in a portion passing through the stand, and the extension shaft is rotated by the rotation of the handle. And an emergency opening / closing bolt for jacking up and jacking down the extension shaft, which has a male screw that passes through the extension shaft and engages with a female screw on the inner surface of the sleeve. To do.

  According to a fourth aspect of the present invention, there is provided a valve reinforcement device comprising: a pipe housing a valve stem connected to a valve box housing a valve element; and a gland press for holding a gland packing for maintaining the sealing performance of the valve stem from the pipe. The valve stem is protruded, the male screw of the protruded valve stem and the female screw of the yoke are screwed together to hold the valve stem, and the valve stem is operated with the handle on the opposite side of the valve body with the yoke interposed therebetween. A base plate provided on the yoke type valve, fixed to the pipe on the valve element side from the yoke, an extension shaft connected to the valve stem protruding from the yoke, and extending through the extension shaft. The stand is erected on the base plate so as to cover the yoke, and the extension shaft is provided in a portion passing through the stand, and the extension shaft is rotated by the rotation of the handle. And an emergency opening / closing bolt for jacking up and down the extension shaft, and having an external thread that passes through the extension shaft and engages with an internal thread on the inner surface of the sleeve; A ground press holding portion that is provided and holds the ground press, and a vertical bolt that fixes the ground press holding portion to the base plate across the ground press.

  According to the present invention, the base plate is fixed to the pipe on the valve body side from the yoke, the stand is erected on the base plate so as to cover the yoke through the valve rod protruding from the yoke, and the valve rod passes through the stand. A screw body with a female thread that engages with the male thread of the valve stem is provided, and the valve stem is driven by operating the handle. Therefore, the torsional rigidity associated with the handle operation can be ensured by a stand erected on the base plate. The valve can be opened and closed smoothly. Further, since the ground press holding portion for holding the ground press is provided on the upper portion of the ground press and the ground press holding portion is fixed to the base plate with the vertical bolt across the ground press, not only the yoke but also the ground press can be appropriately reinforced.

  On the other hand, an extension shaft for extending the valve stem is connected to the valve stem, and a sleeve for rotating the extension shaft by turning the handle is provided at a portion where the extension shaft passes through the stand, and the sleeve extends through the extension shaft. When an emergency opening / closing bolt having a male screw that engages with the female screw on the inner surface of the inner sleeve is provided, the sleeve is rotated by rotating the handle to hold the valve stem by the yoke when the yoke is not broken. When the valve stem is operated with force and the yoke is broken, the extension shaft jacks up and down with the emergency opening / closing bolts, so the holding force of the valve stem with the emergency opening / closing bolts and the yoke valve The opening / closing operation of the valve can be smoothly performed without interference with the holding force of the rod. Furthermore, since the valve stem is extended by the extension shaft, it is possible to prevent the valve stem reinforcing device and the valve handle from interfering with each other even when the valve stem is short.

  FIG. 1 is a configuration diagram of a valve reinforcement device according to a first embodiment of the present invention, and FIG. 1 (a) is a front view of the valve reinforcement device when applied to a long neck yoke type valve. FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A, and FIG. 1C is a plan view taken along line CC in FIG. In FIG. 1B, the yoke 23 is shown in cross section, and the illustration of the yoke 23 on the near side is omitted.

  As shown in FIGS. 1A and 1B, a base plate 24 is fixed to the pipe 15 on the valve body side, that is, on the heat radiating plate 17 side from the yoke 23. On this base plate 24, a stand 25 is erected so as to pass through the valve rod 14 protruding from the yoke 23 and cover the yoke 23. A screw thread ring 27 having a female thread is provided at a portion where the valve stem 14 protrudes from the yoke 23, and the male thread of the valve stem 14 is screwed with the female thread of the thread latch ring 27 of the yoke 23 to hold the valve stem 14. A screw body 26 is provided at a portion where the valve stem 14 penetrates the stand 25. The screw body 26 has an internal thread that is screwed with the external thread of the valve stem 14, and is operated by the handle 16 to hold and drive the valve stem 14.

  The gland press 20 is used to hold the gland packing 18 for maintaining the sealing performance of the valve stem 14, and the gland press holding portion 28 is provided on the top of the gland press 20 and holds the gland press 20. The ground press holding portion 28 is attached to the base plate 24 with the vertical bolts 29 across the ground press 20. The gland retainer 20 is fixed to the packing box 19 by being fastened by a nut 22 to an eye bolt 21 provided on a yoke 23 at the upper part of the packing box 19. Thereby, the ground presser 20 is pressed by the eyebolt 21 and the nut 22. In this case, the load is applied to the yoke 23. Therefore, the ground retainer 20 is held by the ground retainer holding part 28, and the ground retainer holding part 28 receives a load on the base plate 24.

  As shown in FIG.1 (c), the gland | wrist holding | maintenance holding | maintenance part 28 consists of two gland | gland pressing | holding holding | maintenance piece 28a, 28b, and when these two gland | wound holding | maintenance holding | maintenance piece 28a, 28b are joined facing each other. In addition, the interval is maintained so as not to interfere with the tightening screw 30 of the valve stem 14 and the gland presser 20, and the interval for allowing the vertical bolt 29 to pass therethrough is arranged. Then, the two ground pressing holding pieces 28 a and 28 b are fixed with the mounting bolt 31. As described above, the gland press holding portion 28 has a structure divided into a plurality of parts so as to keep the gap between the gland press holding portion pieces 28a and 28b so as not to interfere with the tightening screw 30 of the valve stem 14 and the gland press 20. is doing.

  Next, the vertical bolts 29 erected on the base plate 24 are passed through the gaps between the ground presser holding pieces 28 a and 28 b, and the ends are fastened with nuts 32. As a result, the ground press holding portion 28 is fixed to the base plate 24 across the yoke 23. Accordingly, since the pressing to the ground press 20 is performed by the ground press holding portion 28 fixed to the base plate 24, the ground press 20 can be pressed without applying a load to the yoke 23. As a result, the gland packing can be tightened without applying a load to the yoke 23, and the gland retainer 20 can be reinforced.

  The base plate 24 is fixed to the pipe 15 below the yoke 23 with connecting bolts 33. As shown in FIG. 1C, the base plate 24 is composed of two base plate pieces 24a and 24b. When the two base plate pieces 24a and 24b are joined to face each other, the pipe 15 (valve stem 14). Are formed so that a through hole for penetrating the vertical bolt 29 and a through hole for penetrating the vertical bolt 29 are formed. The two base plate pieces 24a and 24b are provided with a vertical bolt erecting screw portion for erecting a vertical bolt 29 for fixing the gland press holding portion 28.

  Further, the two base plate pieces 24 a and 24 b are provided with through holes 34 for allowing the leg bolts of the stand 25 to pass therethrough. In FIG. 1C, the leg bolts of the stand 25 are inserted into the through holes 34 of the base plate pieces 24 a and 24 b via the connecting plates 35 of the two base plate pieces 24 a and 24 b, and the stand 25 is fixed to the base plate 24. Shows the case.

  As described above, in the first embodiment, the base plate 24 is fixed to the pipe 15 on the valve body side from the yoke 23, and the stand 25 for reinforcing the yoke 23 and the ground press holding for reinforcing the ground press 20 are attached to the base plate 24. Since the portion 28 is attached, not only the yoke 23 but also the ground presser 20 can be appropriately reinforced. The stand 25 is erected on the base plate 24 so as to pass through the valve rod 14 protruding from the yoke 23 so as to cover the yoke 23, and is screwed with the male screw of the valve rod 14 in a portion where the valve rod 14 penetrates the stand 25. Since the screw body 26 having the female thread is provided, the holding force of the valve rod 14 is shared by the screw body 26 in addition to the holding force of the valve rod 14 by the screw hook ring 27 of the yoke 23. In this case, the internal thread of the screw body 26 is formed so that the holding force of the valve rod 14 by the screw body 26 and the holding force of the valve rod 14 by the screw hook ring 27 of the yoke 23 do not interfere with each other.

  In the above description, the case where the gland press holding portion 28 for reinforcing the gland press 20 is attached to the base plate 24 with the vertical bolts 29 is shown, but the mounting of the gland press holding portion 28 may be omitted. According to the first embodiment, the holding force of the valve stem 14 when the valve stem 14 is driven by operating the handle 16 is shared by the screw body 26 of the stand 25, so that the yoke 23 breaks and the yoke Even when the holding force of the valve stem 14 by the screw thread ring 27 of 23 cannot be secured, the torsional rigidity accompanying the handle operation can be secured by the stand 25 erected on the base plate 24. Therefore, even when the yoke 23 is broken, the valve can be opened and closed smoothly.

  FIG. 2 is a configuration diagram of a valve reinforcing device according to a second embodiment of the present invention, and FIG. 2 (a) is a front view of the valve reinforcing device when applied to a long neck yoke type valve. FIG. 2B is a cross-sectional view taken along the line DD in FIG.

  This second embodiment is an extension for extending the valve stem 14 in place of the screw body 26 at the portion where the valve stem 14 penetrates the stand 25, as compared with the first embodiment shown in FIG. A shaft 37, a sleeve 37 for rotating the extension shaft 36 by a handle operation in a portion where the extension shaft 36 penetrates the stand 25, and an emergency opening / closing bolt 39 for jacking up and down the extension shaft 36 The holding force of the valve stem by the yoke 23 and the holding force of the valve stem 14 by the emergency opening / closing bolt 39 do not interfere with each other.

  The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted. A portion of the valve rod 14 protruding from the yoke 23 is provided with a screw thread ring 27 having a female screw. The male screw of the valve rod 14 is screwed with the female screw of the screw thread ring 27 of the yoke 23 to hold the valve rod 14. Yes. An extension shaft 36 is connected to the tip end portion of the valve stem 14 by a shaft connecting portion 36a.

  A sleeve 37 is provided at a portion where the extension shaft 36 penetrates the stand 25. The sleeve 37 is fixed to the handle 16 and is engaged with the extension shaft 36 to rotate the extension shaft 36 by turning the handle 16. The emergency opening / closing bolt 39 passes through the main shaft 36b of the extension shaft 36 and is inserted into the main shaft 36b. The outer peripheral surface of the bolt 39 has a male screw that engages with the female screw on the inner surface of the sleeve 37 and is attached to the sleeve 37. ing. A male screw is formed on the main shaft 36b of the extension shaft 36, and a hexagon nut 40 that is screwed with the male screw is attached to the tip of the main shaft 36b.

  When the yoke 23 is not broken, the handle 16 is rotated to hold the valve rod 14 with the screw thread ring 27 of the yoke 23. When the yoke 23 is broken, the emergency opening / closing bolt 39 and the hexagon nut 40 The rod 14 is held and the extension shaft 36 is jacked up and down to open and close the valve.

  FIG. 3 is an explanatory view of the movable part of the valve reinforcing device by the handle operation when the yoke 23 is not broken. FIG. 3 (a) is a partially cutaway sectional view of the valve reinforcing device, and FIG. It is sectional drawing of the EE line | wire of Fig.3 (a). 4 is an explanatory view of the movable portion of the valve reinforcing device when the extension shaft 36 is moved by the handle operation of FIG. 3, and FIG. 4 (a) is a partially cutaway sectional view of the valve reinforcing device. (B) is sectional drawing of the FF line | wire of Fig.4 (a). In FIGS. 3 and 4, the base plate 24, the stand 25, and the ground press holding portion 28 are not shown.

  In FIG. 3A, when the handle 16 is rotated, the painted portion is rotated in conjunction with it. In other words, when the handle 16 rotates, the sleeve 37 fixed to the handle 16 and the emergency opening / closing bolt 39 attached so that the male screw on the outer peripheral surface is engaged with the female screw on the inner surface of the sleeve 37 rotate in conjunction with each other. Move. As shown in FIG. 3B, the extension shaft 36 is fitted in a square hole of the sleeve 37, and the extension shaft 36 is also rotated when the sleeve 37 is rotated.

  In FIG. 4A, when the extension shaft 36 rotates, the painted portion rotates in conjunction with it. That is, when the extension shaft 36 is rotated, the valve rod 14 is rotated via the shaft coupling portion 36a, and the valve rod 14 is screw-connected to the screw thread wheel 27 attached to the yoke 23. The valve rod 14 is held by the wheel 27, and the valve rod 14 (extension shaft 36) moves in the vertical direction. In this case, the extension shaft 36 is fitted into the square hole of the sleeve 37 as shown in FIG. 4B, and the extension shaft 36 is rotated by the turning force applied to the extension shaft 36 by the turning force of the sleeve 37. . Thus, when the yoke 23 is not broken, the valve can be opened and closed by operating the handle 16.

  Next, the opening / closing operation of the valve when the yoke 23 is broken will be described. FIG. 5 is an explanatory diagram of the valve opening / closing operation when the yoke 23 is broken, FIG. 5 (a) is an explanatory diagram of the valve closing operation, and FIG. 5 (b) is an explanatory diagram of the valve opening operation.

  In FIG. 5A, since the yoke 23 is broken, the valve stem 14 cannot be held by the screw thread ring 27 attached to the yoke 23 when the valve stem 14 moves. Therefore, the emergency opening / closing bolt 39 is rotated. Since the male screw on the outer peripheral surface of the emergency opening / closing bolt 39 is screwed with the female screw on the inner surface of the sleeve 37 fixed to the handle 16, the handle 16 is fixed and the emergency opening / closing bolt 39 is rotated. Then, the emergency opening / closing bolt 39 moves up and down. Therefore, the emergency opening / closing bolt 39 is rotated and moved downward in FIG. 5A to push down the extension shaft 36. As a result, the filled portion moves in conjunction with the downward movement of FIG. 5A, and the valve is closed.

  On the other hand, in the valve opening operation, as shown in FIG. 5B, the hexagon nut 40 screwed into the main shaft 36b of the extension shaft 36 is rotated. Since the hexagon nut 40 is screwed into the main shaft 36b of the extension shaft 36, when the hexagon nut 40 is rotated, the main shaft 36b of the extension shaft 36 is moved. On the contrary, when the position of the hexagon nut 40 is fixed and the hexagon nut 40 is rotated, the main shaft 36b of the extension shaft 36 moves. Therefore, the emergency opening / closing bolt 39 is fixed, and the hexagon nut 40 is rotated at the position of the emergency opening / closing bolt 39. As a result, the main shaft 36b of the extension shaft 36 is moved upward in FIG. 5B in the manner of jacking up, and the valve is opened.

  As described above, in the second embodiment, the extension shaft 36 for extending the valve stem 14 is connected to the valve stem 14, and the extension shaft 36 is rotated by the rotation of the handle 16 at a portion where the extension shaft 36 penetrates the stand 25. A sleeve 37 for rotating 36 is provided, and an emergency opening / closing bolt 39 having an external thread that passes through the extension shaft 36 and is engaged with the internal thread of the inner surface of the sleeve 37 is provided. In a state where the yoke 23 is not broken, the sleeve 37 is rotated by the rotation of the handle 16, and the valve rod 14 is operated by the holding force of the valve rod 14 by the screw hook ring 27 attached to the yoke 23. On the other hand, in a state where the yoke 23 is broken, the valve 39 is opened and closed by jacking up and down the extension shaft 36 by the emergency opening / closing bolt 39 and the hexagon nut 40.

    In the above description, the gland retainer holding part 28 for reinforcing the gland retainer 20 is attached to the base plate 24 with the vertical bolts 29, but the gland retainer holding part 28 may be omitted. According to the second embodiment, in a state where the yoke 23 is not broken, the valve rod 14 is operated by the holding force of the valve rod 14 by the screw hook wheel 27 attached to the yoke 23, and the yoke 23 is broken. In this state, the valve stem 14 is operated by the emergency opening / closing bolt 39 and the hexagonal nut 40, so that the holding force of the valve stem 14 by the emergency opening / closing bolt 39 and the holding of the valve rod 14 by the screw screw wheel 27 of the yoke 23 are maintained. Valves can be opened and closed smoothly without interference with force. Furthermore, since the valve stem 14 is extended by the extension shaft 36, even if the valve stem 14 is short, the valve stem reinforcement device and the valve handle 16 do not interfere with each other.

The block diagram of the valve reinforcement instrument concerning the 1st Embodiment of this invention. The block diagram of the valve reinforcement instrument concerning the 2nd Embodiment of this invention. Explanatory drawing of the movable part of the valve reinforcement instrument by handle operation when the yoke is not fracture | ruptured in the 2nd Embodiment of this invention. Explanatory drawing of the movable part of the valve reinforcement instrument when an extension shaft moves by handle operation of FIG. Explanatory drawing of opening / closing operation | movement of a valve when the yoke fractures | ruptures in the 2nd Embodiment of this invention. The front view of an example of a long neck yoke type valve. Sectional drawing in the AA of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... York type valve, 12 ... Valve body, 13 ... Valve box, 14 ... Valve rod, 15 ... Pipe, 16 ... Handle, 17 ... Heat sink, 18 ... Gland packing, 19 ... Packing box, 20 ... Gland retainer, 21 ... Eye bolts, 22 ... Nuts, 23 ... Yoke, 24 ... Base plate, 25 ... Stand, 26 ... Screw body, 27 ... Screw hook ring, 28 ... Gland holding part, 29 ... Vertical bolt, 30 ... Tightening screw, 31 ... Installation Bolt, 32 ... nut, 33 ... connecting bolt, 34 ... through hole, 35 ... connecting plate, 36 ... extension shaft, 36a ... shaft connecting portion, 36b ... main shaft, 37 ... sleeve, 39 ... emergency opening / closing bolt, 40 ... Hexagon nut

Claims (4)

A pipe that houses the valve stem is connected to a valve box that houses the valve body, and the valve stem is projected from the pipe through a gland press that holds a gland packing for maintaining the sealing performance of the valve stem. A male screw and a female screw of the yoke are screwed together to hold the valve stem, and provided in a yoke type valve that operates the valve stem with a handle on the opposite side of the valve body across the yoke,
A base plate fixed to the pipe on the valve body side from the yoke;
A stand erected on the base plate so as to cover the yoke through the valve rod protruding from the yoke;
A valve reinforcing device, comprising: a valve body provided at a portion penetrating the stand and having a female screw threadedly engaged with a male screw of the valve stem and operated by the handle. A pipe that houses the valve stem is connected to a valve box that houses the valve body, and the valve stem is projected from the pipe through a gland press that holds a gland packing for maintaining the sealing performance of the valve stem. A male screw and a female screw of the yoke are screwed together to hold the valve stem, and provided in a yoke type valve that operates the valve stem with a handle on the opposite side of the valve body across the yoke,
A base plate fixed to the pipe on the valve body side from the yoke;
A stand erected on the base plate so as to cover the yoke through the valve rod protruding from the yoke;
A screw body which is provided at a portion where the valve stem passes through the stand and has a female screw which is screwed with a male screw of the valve stem and which is operated by the handle;
A gland press holding portion that is provided on the top of the gland press and holds the gland press;
A valve reinforcing device comprising: a vertical bolt that fixes the ground pressing holding portion to the base plate across the ground pressing. A pipe that houses the valve stem is connected to a valve box that houses the valve body, and the valve stem is projected from the pipe through a gland press that holds a gland packing for maintaining the sealing performance of the valve stem. A male screw and a female screw of the yoke are screwed together to hold the valve stem, and provided in a yoke type valve that operates the valve stem with a handle on the opposite side of the valve body across the yoke,
A base plate fixed to the pipe on the valve body side from the yoke;
An extension shaft connected to a valve stem protruding from the yoke and extending the valve stem;
A stand erected on the base plate so as to cover the yoke through the extension shaft;
A sleeve for turning the extension shaft by turning the handle, the extension shaft being provided in a portion penetrating the stand;
A valve reinforcing device comprising an emergency opening / closing bolt for jacking up and jacking down the extension shaft, which has a male screw passing through the extension shaft and screwed into a female screw on the inner surface of the sleeve. A pipe that houses the valve stem is connected to a valve box that houses the valve body, and the valve stem is projected from the pipe through a gland press that holds a gland packing for maintaining the sealing performance of the valve stem. A male screw and a female screw of the yoke are screwed together to hold the valve stem, and provided in a yoke type valve that operates the valve stem with a handle on the opposite side of the valve body across the yoke,
A base plate fixed to the pipe on the valve body side from the yoke;
An extension shaft connected to the valve stem protruding from the yoke and extending the valve stem;
A stand erected on the base plate so as to pass through the extension shaft and cover the yoke;
A sleeve for turning the extension shaft by turning the handle, the extension shaft being provided in a portion penetrating the stand;
An emergency opening / closing bolt for jacking up and jacking down the extension shaft, having a male screw that passes through the extension shaft and engages with a female screw on the inner surface of the sleeve;
A gland press holding portion that is provided on the top of the gland press and holds the gland press;
A valve reinforcing device comprising: a vertical bolt that fixes the ground pressing holding portion to the base plate across the ground pressing.

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