JP4969413B2 - Valve reinforcement apparatus and method - Google Patents

Description

  The present invention relates to a valve reinforcing device and method for reinforcing a yoke and 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.

  4 is a front view of an example of a yoke type valve used in the LNG facility, and FIG. 5 is a cross-sectional view taken along line AA of FIG. In the yoke type valve 11, a pipe 15 penetrating the valve rod 14 is drawn from a 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.

  Since the yoke type valve 11 opens and closes the piping of the LNG facility, the valve box 13 containing the valve body 12 is kept at a low temperature. Therefore, a heat radiating 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.

  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 to close the valve, pressure is applied to the valve stem 14 upward from the valve body 12 at the tip of the valve stem 14. 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). ). That is, 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 that is attached to this and is arranged coaxially with the valve stem of the open / close valve is the tip of the valve stem. The movement of the valve stem is regulated by the first valve stem movement restricting tool, the second shaft member is brought into contact with the side surface of the packing presser fitted to the valve stem, and the packing is moved by the first packing presser movement restricting tool. A plate member attached to the valve stem that restricts the movement of the presser foot, is attached to the valve stem that extends from the packing presser, contacts the packing presser by the second packing presser movement restrictor, and restricts the movement of the packing presser. Is fixed to the open / close valve by a second valve rod movement restricting tool via the support body to restrict the movement of the valve rod, thereby replacing and repairing the yoke of the open / close valve.
Japanese Unexamined Patent Publication No. 7-248065 Japanese Patent Laying-Open No. 2005-288656

  However, nearly 30 years have passed since the use of the LNG equipment, and recently there has been an event that the yoke 23 of the yoke type valve 11 is cracked due to aging, local pressure increase in the pipe, or thinning due to corrosion. It was found that this occurred. Due to cracking or thinning of the yoke 23, the valve rod cannot be held, and the closing operation becomes difficult. Further, when cracking progresses at the portion where the eyebolt of the yoke 23 is attached, it is conceivable that the gland retainer 20 of the yoke type valve 11 falls off. Early measures are needed.

  Therefore, it is conceivable to repair the defect. However, in order to replace the part of the yoke type valve 11 or itself, depending on the arrangement position of the yoke type valve, the LNG facility itself must be stopped. . That is, when the yoke type valve is disposed in the main system of the LNG facility and the yoke type valve is removed from the system, the LNG facility itself is stopped. Therefore, it is practically impossible to shut down the LNG facility only for the replacement of the defective yoke type valve.

  Although it is possible to replace the yoke using the valve repair jig disclosed in Patent Document 2, 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. Although repairing by welding may be considered as a repairing method, since LNG is flammable, repair welding cannot be performed from the viewpoint of safety. This is because when welding is performed, sparks and high-temperature heat are generated, and the risk of ignition or ignition of LNG increases.

  As described above, it is necessary to take measures to prevent the ground retainer 20 from falling off while maintaining the strength of the yoke 23 even in a place where repair is difficult for a trouble that has occurred for the first time after 30 years have passed since the operation of the LNG facility. It is.

  An object of the present invention is to provide a valve reinforcing device and method that can reinforce a yoke or a gland presser of a yoke type valve even in a place where repair is difficult.

  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 that is provided on the yoke type valve and is fixed to the pipe on the valve body side from the yoke, and a female screw that is provided on the handle side of the yoke and that engages with a male screw of the valve stem, and holds the valve stem A valve stem retainer, a through bolt for fixing the valve stem retainer to the base plate across the yoke, and the ground retainer provided on the handle side of the ground retainer. And ground presser holder that, 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 second aspect of the present invention, there is provided the valve reinforcing device according to the first aspect, wherein the base plate has a structure divided into a plurality of parts so that the base plate can be mounted from the periphery of the pipe. .

  According to a third aspect of the present invention, there is provided the valve reinforcing device according to the first or second aspect, wherein the gland press holding portion is formed in a plurality of portions so as to maintain an interval that does not interfere with the tightening screw of the valve stem and the gland press. It has a divided structure.

  According to a fourth aspect of the present invention, there is provided a yoke type valve reinforcing method in which a pipe for housing a valve stem is connected to a valve box containing a valve body, and through a gland presser for holding a gland packing for maintaining the sealing performance of the valve stem. The valve stem is protruded from the pipe, and the male screw of the protruding valve stem and the female screw of the yoke are screwed together to hold the valve stem, and the valve stem is held by the handle opposite to the valve body with the yoke interposed therebetween. A base plate is fixed to the pipe on the valve body side from the yoke, and a ground press holding portion for holding the ground press is disposed on the handle side of the ground press, The ground press holding portion is fixed to the base plate with a vertical bolt across the press.

  According to the present invention, the base plate is fixed to the pipe on the valve body side from the yoke, and the valve rod retainer having the female thread to be engaged with the male thread of the valve stem is provided on the upper portion of the yoke. The load on the valve stem is held by the valve stem presser fixed to the base plate. Therefore, no load is applied to the yoke. Further, since the valve stem is screwed with the valve stem presser and the screw, the opening / closing handle can be operated, and the yoke can be reinforced without impairing the function of the yoke type valve.

  In addition, the base plate is fixed to the pipe on the valve element side from the yoke, and a ground press holding part that holds the ground press is provided on the handle side of the ground press, and the ground press holding part is fixed to the base plate with a vertical bolt across the ground press The pressing to the ground press is performed by the ground press holding portion fixed to the base plate. Therefore, since the gland press can be pressed without applying a load to the yoke, the yoke can be reinforced without impairing the function of the yoke type valve, and hence the gland press can be reinforced.

  FIG. 1 is a perspective view of a valve reinforcing device according to an embodiment of the present invention. The valve reinforcing device includes a yoke reinforcing portion 24 and a ground pressing reinforcing portion 25. The yoke reinforcing portion 24 includes a base plate 26 that is fixed to the pipe 15 below the yoke 23, a valve rod holder 27 that holds the valve rod 14, and a through bolt that fixes the valve rod holder 27 to the base plate 26 across the yoke 23. 28. The ground press reinforcing portion 25 includes a base plate 26, a ground press holding portion 29 that holds the ground press 20, and a vertical bolt 30 that fixes the ground press holding portion 29 to the base plate 26 across the ground press 20. The

  As shown in FIG. 1, the yoke reinforcing portion 24 and the ground pressing reinforcing portion 25 are arranged so that the components do not interfere with each other. In FIG. 1, the base plate 26 is common, and the valve rod retainer 27 of the yoke reinforcing portion 24 and the ground retainer holding portion 29 of the ground retainer reinforcing portion 25 are arranged at an angle of 90 ° to each other.

  2 is a configuration diagram of the yoke reinforcing portion 24, FIG. 2 (a) is a front view, FIG. 2 (b) is a plan view of the valve stem holder 27, and FIG. 2 (c) is a plan view of the base plate 26.

  The base plate 26 is fixed to the pipe 15 below the yoke 23 with mounting bolts 31. As shown in FIG. 2 (c), the base plate 26 is composed of two base plate pieces 26a and 26b, and these two base plate pieces 26a and 26b are used for penetrating the pipe 15 when facing each other. The pipe through hole 32 and the through bolt through hole 33 for allowing the through bolt 28 to pass therethrough are formed. Each of the two base plate pieces 26a and 26b is provided with a vertical bolt erecting screw portion 34 for erecting a vertical bolt 30 for fixing the gland press holding portion 29 of the gland press reinforcing portion 25.

  When the base plate 26 is fixed to the pipe 15, the two base plate pieces 26 a and 26 b are arranged so that the pipe 15 is sandwiched between the pipe through holes 32, and the two base plate pieces 26 a and 26 b are fixed with the mounting bolts 31. Both ends of the mounting bolt 31 are tightened with nuts 35. Thus, the base plate 26 has a structure divided into a plurality of parts so that the base plate pieces 26a and 26b can be mounted from the periphery of the pipe 15.

  The valve stem retainer 27 is provided on the upper portion of the yoke 23. As shown in FIG. 2 (b), the valve stem retainer 27 comprises two valve stem retainer pieces 27a and 27b. When these two valve stem retainer pieces 27a and 27b are joined face to face, A threaded body through hole 37 for sandwiching a threaded body 36 provided with a female thread to be screwed with a male thread of the rod 14 and a through bolt through hole 38 for penetrating the through bolt 28 are formed. ing. The screw body 36 is fitted to the two valve stem pressing pieces 27 a and 27 b and supported by the stop pin 44.

  When the valve stem retainer 27 is fixed to the valve stem 14, the female screw of the screw body 36 is screwed into the male screw of the valve stem 14, and the screw body 36 is positioned at the upper portion of the yoke. Then, the screw body 36 is disposed between the two valve rod pressing pieces 27a and 27b so that the screw body 36 is sandwiched between the screw body through holes 37, and the two valve rod pressing pieces 27a and 27b are fixed by the mounting bolt 39. Thus, the valve stem retainer 27 has a structure divided into a plurality of portions so that the valve stem retainers 27a and 27b can be mounted from the periphery of the valve stem 14 via the threaded body 36. The screw body 36 does not rotate in accordance with the rotation of the valve stem 14.

  In the above description, the valve rod retainer 27 is divided and the screw body 36 is provided separately. However, the valve rod retainer 27 may be integrally structured. In this case, the screw body 36 is applied to the valve stem retainer 27 having an integral structure, and the male thread of the valve stem 14 and the female thread of the threaded body 36 are screwed together to attach the valve stem retainer 27 to the valve stem 14. .

  Next, the through bolt 28 is passed through the through bolt through hole 33 of the base plate 26 and the through bolt through hole 38 of the valve stem holder 27, and both ends of the through bolt 28 are tightened with nuts 40. As a result, the valve stem retainer 27 is fixed to the base plate 26 across the yoke 23.

  Therefore, since the load of the valve stem 14 is held by the valve stem presser 27 fixed to the base plate 26, no load is applied to the yoke 23. Further, since the valve stem 14 is screwed with the valve stem presser 27 with a screw, the valve can be opened and closed, and the yoke 23 can be reinforced without impairing the function of the yoke type valve.

  3A and 3B are configuration diagrams of the ground pressing reinforcement portion 25. FIG. 3A is a front view, FIG. 3B is a plan view of the ground pressing holding portion 29, and FIG. 3C is a plan view of the base plate 26. is there. In FIG. 3A, the yoke 23 is shown in cross section, and the illustration of the front yoke 23 is omitted.

  The base plate 26 is common to the yoke reinforcing portion 24 shown in FIG. Accordingly, the base plate 26 has the same configuration as that shown in FIG. As described above, since the gland retainer holding portion 29 of the gland retainer reinforcing portion 25 is provided at a position rotated 90 ° with respect to the valve rod retainer 27 of the yoke reinforcing portion 24, in FIG. The relative position is rotated by 90 °.

  The ground press holding portion 29 is provided on the top of the ground press 20. As shown in FIG. 3 (b), the ground press holding portion 29 is composed of two ground press holding portion pieces 29a and 29b, and the two ground press holding portion pieces 29a and 29b are joined to face each other. In addition, the interval is maintained so as not to interfere with the tightening screw 41 of the valve stem 14 and the ground presser 20, and the interval for allowing the vertical bolt 30 to pass therethrough is arranged.

  Then, the two ground pressing holding pieces 29a and 29b are fixed by the mounting bolts 42. As described above, the gland press holding part 29 has a structure divided into a plurality of parts so as to keep the gap between the gland press holding part pieces 29a and 29b so as not to interfere with the tightening screw 41 of the valve stem 14 and the gland presser 20. is doing.

  Next, the vertical bolts 30 erected on the base plate 26 are passed through the gaps between the ground presser holding pieces 29 a and 29 b, and the ends are fastened with nuts 43. As a result, the gland holding unit 29 is fixed to the base plate 26 across the yoke 23. Accordingly, the ground press 20 is pressed by the ground press holding portion 29 fixed to the base plate 26, so that 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.

  According to the embodiment of the present invention, the yoke 23 can be reinforced without hindering the function (opening / closing) of the valve, and tightening of the gland retainer 20 to the gland packing can be ensured. Further, when the yoke reinforcing portion 24 and the ground pressing reinforcing portion 25 are attached, the components are arranged so as not to interfere with each other because they are arranged with an angle (for example, 90 °) shifted.

The perspective view of the valve reinforcement instrument concerning embodiment of this invention. The block diagram of the yoke reinforcement part in embodiment of this invention. The block diagram of the ground pressing reinforcement part in embodiment of this invention. The front view of an example of the yoke type valve used for LNG equipment. Sectional drawing in the AA of FIG.

Explanation of symbols

11 ... Yoke type valve, 12 ... Valve, 13 ... Valve box, 14 ... Valve rod, 15 ... Pipe, 16 ... Handle, 17 ... Cold insulation plate, 18 ... Gland packing, 19 ... Packing box, 20 ... Gland retainer, 21 ... Eye bolts, 22 ... Nuts, 23 ... Yoke, 24 ... Yoke reinforcement part, 25 ... Gland press reinforcement part, 26 ... Base plate, 27 ... Valve rod presser, 28 ... Through bolt, 29 ... Gland press holding part, 30 ... Vertical bolt 31 ... Mounting bolt, 32 ... Pipe through hole, 33 ... Through bolt through hole, 34 ... Vertical bolt standing screw part, 35 ... Nut, 36 ... Screw body, 37 ... Screw body through hole, 38 ... Through bolt through hole 39 ... Mounting bolt, 40 ... Nut, 41 ... Tightening screw, 42 ... Mounting bolt, 43 ... Nut, 44 ... Set pin

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 valve stem retainer that is provided on the handle side of the yoke and has a female thread that engages with a male thread of the valve stem and holds the valve stem;
A through bolt for fixing the valve stem retainer to the base plate across the yoke;
A gland press holding portion that is provided on the top of the gland press and holds the gland press;
A vertical bolt for fixing the ground pressing holding portion to the base plate across the ground pressing;
A valve reinforcing device comprising:   The valve reinforcing device according to claim 1, wherein the base plate has a structure divided into a plurality of parts so that the base plate can be mounted from the periphery of the pipe.   The said gland | wrist holding | maintenance holding | maintenance part has a structure divided | segmented into several parts so that the space | interval which does not interfere with the said valve rod and the fastening screw of the said gland | wrist holder may be maintained. Valve reinforcement equipment. 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. In the reinforcing method of the yoke type valve, the male screw and the female screw of the yoke are screwed together to hold the valve stem, and the valve stem is operated with the handle opposite to the valve body with the yoke interposed therebetween.
A base plate is fixed to the pipe on the valve body side from the yoke,
A ground press holding portion for holding the ground press is disposed on the handle side of the ground press,
A method for reinforcing a yoke-type valve, wherein the ground press holding portion is fixed to the base plate with a vertical bolt across the ground press.

Images