JP2003097761A - Tool for disassembling and repairing active line valve, and disassembling and repairing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool and a method for disassembling and repairing an active line valve that can be repaired by easily removing pressure-proof parts from a switch valve intervened in an active line piping under pressure. SOLUTION: This assembling and repairing tool comprises: a temporary fastening bolt 1 having a long head part for temporarily fastening a valve cover V4; a valve box casing 2 of an upper and lower two-split type, which surrounds a valve box V1 and is airtightly fixed to an active line piping P; a valve cover detaching mechanism 6, which is composed of a closable shut-off valve 4 and a valve cover casing 5 and is airtightly fixed to the valve box casing 2; and a casing cover 7 of a right and left two-split type, which is airtightly fixed to the valve cover casing 5 and has insertion holes 8 and 9, into which the valve cover V4 and the temporary fastening bolt 1 are airtightly inserted, respectively. This disassembling and repairing method includes a first step for temporarily fastening the valve cover V4 with the temporary bolt 1 to a seventh step for assembling the valve by a reverse step from the step for temporarily fastening the valve cover V4 to the step removing the casing cover 7 from the valve cover casing 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disassembly / repair jig for a live line valve and a method for disassembling / repairing the same, and more particularly, to a pressure resistant component under pressure from an opening / closing valve interposed in a live line pipe. The present invention relates to a disassembly / repair jig for a live line valve that can be removed, replaced or repaired, and a disassembly / repair construction method thereof.

[0002]

2. Description of the Related Art Conventionally, this type of live line valve has been disassembled and
As the repair jig and the disassembling / repairing method, the disassembling / repairing jig and the disassembling / repairing method shown in FIG. 8 are known.
This will be described with reference to the drawings. First, the first step (1) is a step of closing the valve a and removing the handle b from the valve rod c, and the second step (2) is a replacement packing presser d ′. And a repair jig h having a holding shaft g incorporating a replacement yoke e ′ is fixed to the valve lid f, and the valve shaft c is held in the closing direction of the valve a by the holding shaft g. Step 3) is a step of removing the existing packing presser d and the existing yoke e from the valve lid f and moving them to the presser shaft g side, and cutting them to remove them from the valve rod c. The fourth step (4)
Replace the replacement packing retainer d'and the replacement yoke e'with the valve rod c.
The fifth step (5) is a step of attaching the replacement packing retainer d ′ and the replacement yoke e ′ to the valve lid f, and the sixth step (6) is the step of mounting the repair jig h on the valve. This is a step of attaching the handle b to the valve rod c while removing it from the lid f.

[0003]

The conventional disassembling / repairing jig and the disassembling / repairing method of the live line valve are constructed as described above. When repairing the live line valve, the repairing jig h is used. Since the valve rod c must be held by the holding shaft g of the repair jig h until the repair is completed, it is necessary to fix the valve rod c, which is a pressure resistant component, and the sliding of the valve seat surface. In addition to maintenance, the valve lid f
There was the inconvenience that the gaskets could not be replaced.

Moreover, when removing the existing packing retainer d and the existing yoke e, which are non-pressure resistant parts, from the valve rod c, the existing packing retainer d and the existing yoke e cannot be removed unless they are cut with a cutter. Not only does it take a lot of time to cut by the above method, but also the valve rod c, which is an existing part, is damaged by the cutter.

The present invention solves the above-mentioned disadvantages in the prior art. A live line in which pressure-resistant parts can be easily removed from the open / close valve provided in the live line pipe under pressure and replaced or repaired. It is intended to provide a valve disassembly / repair jig and a disassembly / repair construction method therefor.

[0006]

In order to achieve the above object, the invention according to claim 1 is a jig used for disassembling / repairing an on-off valve interposed in a live line pipe, Temporary tightening bolt with a long head for temporarily fastening the valve lid by replacing the lid bolt that fastens the valve lid of the on-off valve and the valve box of the on-off valve can be enclosed and removed from the live line piping. A valve box casing that is airtightly fixed to the upper and lower halves and has an open upper part, an openable and closable shutoff valve, and a valve lid casing that is mounted on the upper side of the shutoff valve and has an open upper part. In addition, the lower side of the shutoff valve has a valve lid attaching / detaching mechanism that is detachably and airtightly fixed to the upper peripheral edge of the valve box casing, and insertion holes through which the valve lid and the temporary tightening bolts are respectively inserted airtight Left and right split type that is detachably airtightly fixed to the upper edge of the casing In which it comprises a casing lid, a.

According to the first aspect of the present invention, the upper and lower half-split valve box casings are airtightly fixed to the live line piping, and the shutoff valve of the valve lid detaching mechanism including the shutoff valve and the valve lid casing is used as the valve. By air-tightly fixing to the box casing, air-tightly fixing the left and right half-divided casing lids to the valve lid casing of the valve lid detaching mechanism, and air-tightly inserting the valve lid and the temporary tightening bolt into the respective insertion holes of the casing lid, The valve box and valve lid of the open / close valve can be sealed.

In the closed state of the valve box and the valve lid, the temporary tightening bolt having the long head for temporarily fastening the valve lid to the valve box can be projected to the upper part of the casing lid. The valve body including the valve body can be disengaged from the valve box by fully opening the valve body and then rotating the temporary tightening bolt protruding above the casing lid to release the fastening.

In the disengaged state of the valve lid including the valve element, the valve lid including the valve element is pulled up together with the temporary tightening bolt until the lower portions are located in the valve lid casing to close the shutoff valve. The valve body can be released from pressure resistance.

In a state where the valve lid and the valve body are released from the pressure resistance, the casing lid can be disengaged from the valve lid casing, and the valve lid and the temporary fastening bolt including the valve body together with the casing lid can be removed from the valve lid casing.

According to a second aspect of the present invention, in the invention according to the first aspect, the valve box casing and the valve lid casing include:
Nozzles having cocks are provided at two locations, respectively, and one nozzle of the valve lid casing is provided with a communication pipe in which a pressure gauge is interposed.

According to the second aspect of the present invention, when the on-off valve is disassembled, after assembling all the jigs, the dry gas is introduced from the nozzle communicating with the pressure gauge provided in the valve lid casing. It is possible to confirm the airtightness of the valve box casing, the shutoff valve, the valve lid casing and the casing lid by pressurizing above the live line pressure. Also, after closing the shutoff valve, install it in the valve lid casing. By opening the cock of the nozzle provided, it is possible to confirm the airtightness when the shutoff valve is closed, and before closing the shutoff valve, open any two cocks of the nozzle,
By passing the dry gas from one of them, the valve box, the shutoff valve, the valve body and the valve lid can be dried. When assembling the on-off valve, after assembling the casing lid, the dry gas is introduced from a nozzle communicating with the pressure gauge provided in the valve lid casing to pressurize it to a pressure higher than the live line pressure. It is possible to confirm the airtightness of the casing lid, and before opening the shut-off valve, open the cock of the nozzle of the valve lid casing, and let dry gas flow from one of the nozzles to allow the valve body and valve lid to open. Can be dried.

According to a third aspect of the present invention, there is provided a method for disassembling and repairing an on-off valve interposed in a live line pipe, wherein a lid bolt for fastening a valve lid of the on-off valve has a long head portion. First step of replacing the valve with the temporary tightening bolt and temporarily tightening the valve lid with the temporary tightening bolt, and enclosing the valve box of the on-off valve with the valve box casing of which the upper and lower halves are open. And a second step of removably and airtightly fixing the valve box casing to the live line pipe, a shut-off valve that can be opened and closed, and a valve lid casing that is mounted on the upper side of the shut-off valve and has an open upper portion. The valve lid attaching / detaching mechanism, which is formed by inserting the valve lid attaching / detaching mechanism into the open / close valve with the shutoff valve opened, and detachably and airtightly fixing to the upper peripheral edge of the valve casing, and the insertion holes for the valve lid and the temporary tightening bolt. The left and right halves of the casing lid are The fourth step of airtightly inserting the valve lid and the temporary tightening bolt into the holes to detachably fix the valve lid casing to the upper peripheral edge of the valve lid, and fully opening the valve body of the on-off valve and temporarily tightening the temporary tightening bolt. The fifth step of unraveling, pulling up the valve lid including the valve body and the temporary tightening bolt until the lower parts are located in the valve lid casing, closing the shutoff valve to release the valve lid and the valve body from the pressure resistance, and A sixth step of disengaging the two-part casing lid from the valve lid casing, and removing the casing lid from the valve lid casing together with the valve lid containing the valve body and the temporary tightening bolt, and the valve containing the repaired or replaced valve body A seventh step of assembling the lid into the valve box by a reverse step of the sixth step from the first step of temporarily fastening the valve lid to the removal of the casing lid from the valve lid casing. .

According to the third aspect of the invention, in the first step, the lid bolt of the valve lid is replaced with the temporary tightening bolt to temporarily tighten the bolt, and in the second step, the valve box is surrounded and the upper and lower parts are closed. A split type valve box casing is airtightly fixed to the live line piping, and as a third step, a valve lid attaching / detaching mechanism consisting of an openable / closable shutoff valve and a valve lid casing is airtightly fixed to the upper peripheral edge of the valve box casing. In the fourth step, the left and right two-divided casing lids are airtightly inserted into the respective insertion holes of the valve lid and the temporary tightening bolt, and airtightly fixed to the upper peripheral edge of the valve lid casing. It is possible to fully open and release the temporary fastening of the temporary fastening bolt, pull up the valve lid including the valve element and the temporary fastening bolt to close the shutoff valve, and release the valve lid and the valve element from the pressure resistance. As a process, the casing lid is separated from the valve lid casing, and the valve body Together with the valve lid and Karishime bolt comprises can be removed from the valve lid casing, as a seventh step, a valve lid comprising a repair or exchanged valve body can be assembled to the valve body.

In the invention according to claim 4, in the invention according to claim 3, after the completion of the fourth step, the cock of the nozzle provided with the pressure gauge attached to the valve lid casing is opened, and the dry gas is discharged. Introduce and pressurize above the live line pressure,
After checking the airtightness of the valve box casing, the shutoff valve, the valve lid casing and the casing lid, and after closing the shutoff valve in the fifth step, the cock of one nozzle provided in the valve lid casing is closed. Before opening the shutoff valve in the step of opening and confirming the airtightness of the shutoff valve, and in the step of assembling the valve lid including the repaired or replaced valve body into the valve box in the seventh step, the shutoff valve is provided in the valve lid casing. The step of opening the cock of the nozzle to which the pressure gauge is attached, introducing dry gas to pressurize above the live line pressure, and confirming the airtightness of the valve lid casing and the casing lid is airtightly fixed.

According to the invention of claim 4, when the on-off valve is disassembled, it is possible to confirm the airtightness of the valve box casing, the shutoff valve, the valve lid casing and the casing lid, and to check the shutoff valve. It is possible to confirm the airtightness at the time of closing, and at the time of assembling the open / close valve, it is possible to confirm the airtightness of the valve lid casing and the casing lid, so that it is possible to disassemble and assemble the live line valve. It is possible to prevent leakage of the pressure fluid in the live line.

According to a fifth aspect of the invention, in the invention according to the third aspect, any two nozzles provided in the valve box casing and the valve lid casing before closing the shutoff valve in the fifth step. Opening the cock, and drying gas from one of them to dry the valve box, the shutoff valve, the valve body and the valve lid, and the valve lid including the valve body repaired or replaced in the seventh step Before opening the shut-off valve in the process of assembling into the valve box, the cocks of the two nozzles provided in the valve lid casing are opened, and dry gas is introduced from one of them to dry the valve body and the valve lid. And the step of performing.

According to the fifth aspect of the present invention, when the on-off valve is disassembled, the valve box, the shutoff valve, the valve body and the valve lid can be dried, and when the on-off valve is assembled, the valve body and the valve body can be dried. Since the valve lid can be dried, it is possible to eliminate the dew condensation on the valve box, the valve body, the valve lid and the shutoff valve, or the icing in the cold in the disassembling work and the assembling work of the live line valve. The work can be performed smoothly, and the shutoff performance of the on-off valve after assembly can be improved.

A feature of the present invention is that the valve box and the valve lid are hermetically sealed with the valve lid being temporarily fastened by the temporary fastening bolts,
The valve lid including the valve body can be disengaged from the valve box by unfastening the temporary tightening bolt from the outside of the sealed area, and at the same time, the valve lid and the valve body can be separated from the valve box within the sealed area. In addition, the valve lid and the valve body can be released from the pressure resistance by disconnecting the valve lid and the valve body from the valve box by the shutoff valve. As a result, the valve lid and the valve body can be easily removed, so that the pressure-resistant component can be easily replaced or repaired while the on-off valve interposed in the live line piping is under pressure.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, referring to the drawings, an embodiment of the present invention will be described. A disassembly / repair jig for use in removing work of a valve lid including a valve body which is a pressure resistant component of an on-off valve, and The disassembly / repair method will be explained.

First, as shown in FIG. 7, a disassembly / repair jig for a live line valve of the present invention and an on-off valve V interposed in a live line pipe P which is a disassembly / repair target of the disassembly / repair method. explain.

V1 is a valve box inserted in the live line pipe P, and the lower part of the valve lid V4 which supports the valve rod V3 of the valve body V2 incorporated in the valve box V1 via the packing V4a is the valve box. V
1 is detachably fixed to the valve lid V4b with a cap bolt V4b, and a packing retainer V5 fitted on the valve rod V3 is attached to the upper portion of the valve lid V4.
Is a packing retainer bolt / nut V pivotally attached to the valve cover V4.
5a is detachably fixed, and a threaded portion V3 of the valve rod V3 is attached to a yoke V4c formed on the valve lid V4.
A screw ring V4d screwed to a is supported, and a handle V6 is attached to the top of the valve rod V3.

The disassembling / repairing jig used for removing the valve lid V4 including the valve body V2 which is the pressure resistant component of the on-off valve V described above will be described with reference to FIGS. 1 and 2 and FIGS. 5 and 6. Explained.

The disassembling / repairing jig used for removing the valve lid V4 including the valve body V2 is a temporary fastening bolt 1 for temporarily fastening the valve lid V4 by replacing the lid bolt of the valve lid V4. Box V
1 is air-tightly fixed to the upper part of the valve box casing 2 which is composed of an upper and lower split type valve box casing 2 which surrounds 1 and is airtightly fixed to the live line pipe P, and an openable / closable shutoff valve 4 and a valve lid casing 5. A valve lid attaching / detaching mechanism 6 and a left and right two-part split type casing lid 7 which has respective insertion holes 8 and 9 through which the valve lid V4 and the temporary fastening bolt 1 are hermetically inserted and which is airtightly fixed to the valve lid casing 5. I have it.

The temporary tightening bolt 1 has a rod-shaped elongated head portion above the hexagonal head portion of the hexagonal bolt, and a rectangular knob portion is formed on the top portion of the elongated head portion. When temporarily tightening the temporary tightening bolt 1 by replacing it with the cover bolt, the hexagonal head is used for temporary tightening, and the valve cover V4 is connected to the valve box V1 as described later.
When it is disengaged from the above, it is used to release the temporary fastening of the temporary fastening bolt 1 by utilizing the square knob portion.

The valve box casing 2 is formed into a container as a whole with a bottom having a cylindrical peripheral wall and an open top, and is fixed to the live line pipe P so as to face left and right. The holes 3 and 3 are formed, and the left and right fixing holes 3 and 3 are formed.
It is vertically divided into two parts on a horizontal plane passing through the center of 3, and the upper and lower parts are configured to be detachable and airtightly fixable. In addition, packings 3'and 3'are attached to the left and right fixing holes 3 and 3, respectively, and a flange is provided around the open peripheral edge of the upper part, and the peripheral wall formed in a tubular shape is attached to the peripheral wall. A nozzle 18 having a cock 17
Are provided in two places.

The valve lid attachment / detachment mechanism 6 includes an openable / closable shutoff valve 4 which is airtightly fixed to a flange provided around an open peripheral edge of the upper portion of the valve box casing 2, and an upper open portion mounted on the upper side of the shutoff valve 4. A flange is provided around the periphery, and a nozzle 20 having a cock 19 is provided at two locations, and is composed of a valve lid casing 5 having a tubular shape. Further, one nozzle 20 is provided. A communication pipe 22 in which a pressure gauge 21 is interposed is continuously provided in the.

The valve lid attaching / detaching mechanism 6 will be described in more detail. The shutoff valve 4 has a rectangular hollow valve body 11 having a through hole 10 penetrating in the vertical direction, and a handle 12 at the tip of the valve body 11. It is composed of a valve 14 that opens and closes with respect to the through hole 10 by a sliding rod 13 that it has, and a tubular valve lid casing 5 is attached corresponding to the through hole 10. Reference numeral 11 'denotes a bearing of the sliding rod 13 fixed to the valve body 11, and the bearing 11' has a sliding rod 13 '.
A packing made of an O-ring fitted to and a packing retainer are provided. Reference numeral 15 is a packing provided on the lower surface of the valve 14 corresponding to the through hole 10, and reference numeral 16 is a valve when the valve 14 is closed. Valve body 11 for pressing and fixing 14
Is a fixing screw provided on the upper side of the.

The casing lid 7 is composed of a flat plate having an insertion hole 8 through which the valve lid V4 is inserted at the center and a plurality of insertion holes 9 around which the temporary fastening bolts 1 are inserted. The vertical plane passing through the center of the insertion hole 8 in the central portion is divided into left and right halves, and the left and right halves are detachable and airtightly fixed. Further, packings 8'and 9'are attached to the insertion holes 8 and 9, respectively, and are further detachably and airtightly fixed to a flange provided around the open peripheral edge of the upper portion of the valve lid casing 5. ing.

The disassembling / repairing jig used for the work of removing the valve lid V4 including the valve body V2 which is the pressure-resistant component of the present invention is constructed as described above. A process of removing the valve lid V4 including the valve body V2, which is a component, will be described below with reference to FIGS.

The present invention is for disassembling and repairing an on-off valve V, which is interposed in a live line pipe P for conducting a fluid such as gas or liquid such as tap water, in a fluid conducting state. Therefore, prior to using the disassembly / repair jig, first, a joint having surface smoothness is provided in the fixed portion region of the valve box casing 2 in the live line pipe P and the pulling region of the valve lid V4 with respect to the casing lid 7. The sealant tape T is wound to help airtight fixing of the valve box casing 2 to the live line pipe P and airtight insertion of the valve lid V4 to the casing lid 7.

The step of removing the valve lid V4 including the valve body V2 is as follows.
First, as a first step, the lid bolt of the valve lid V4 is replaced with the temporary tightening bolt 1 and temporarily fastened, and as a second step, the valve box V
1 is air-tightly fixed to the live line pipe P by surrounding the upper and lower halves of the valve box casing 2 (this state is shown in FIG. 1), and as the third step, the shutoff valve 4 that can be opened and closed is used. A valve lid attaching / detaching mechanism 6 including a valve lid casing 5 is airtightly fixed to the upper peripheral edge of the valve box casing 2, and as a fourth step, a left / right bisecting casing lid 7 is provided in each of the insertion holes 8 and 9 for the valve lid V4. And the temporary tightening bolt 1 are both airtightly inserted and airtightly fixed to the upper peripheral edge of the valve lid casing 5 (this state is shown in FIG. 2). Open the cock 19 of the nozzle 20 to which the pressure gauge 21 is attached by the communication pipe 22, introduce nitrogen gas which is a dry gas, and pressurize it to the live line pressure or more,
It is possible to confirm the airtightness of the valve box casing 2, the shutoff valve 4, the valve lid casing 5 and the casing lid 7,
As a fifth step, the valve body V2 is fully opened and the temporary fastening bolt 1 is unfastened, the valve lid V4 including the valve body V2 and the temporary fastening bolt 1 are pulled up, and the shutoff valve 4 is closed to close the valve lid. V4 and the valve body V2 can be released from the pressure resistance (this state is shown in FIG. 3), and before the shutoff valve 4 is closed in this step, the valve box casing 2 and the valve lid casing 5 are respectively closed. Nozzles 18, 18, 20, provided at two locations
It is possible to open any one of two cocks 17 and 19 of 20 and conduct dry gas from one of them to dry the valve box V1, the shutoff valve 4, the valve body V2 and the valve lid V4. After closing the shutoff valve 4, the cock 19 of the one nozzle 20 provided in the valve lid casing 5 can be opened to check the airtightness of the shutoff valve 4, and as a sixth step,
The casing lid 7 is disengaged from the valve lid casing 5, and the valve body V
It can be removed from the valve lid casing 5 together with the valve lid V4 including 2 and the temporary tightening bolt 1 (this state is shown in FIG. 4).

Next, the seventh step of assembling the repaired or replaced valve body V2 and valve lid V4 into the valve box V1 is the valve body V.
It can be assembled by the reverse process of the removal process of the valve lid V4 including 2. Before opening the shut-off valve 4 in the seventh step, the cock 19 of the nozzle 20 provided with the pressure gauge 21 provided in the valve lid casing 5 is opened, and dry gas is introduced to apply a pressure higher than the live line pressure. It is possible to confirm the airtightness of the valve lid casing 5 and the casing lid 7 by pressing, and before opening the shutoff valve 4 thereafter, the cocks of the two nozzles 20, 20 provided in the valve lid casing 5 It is possible to dry the valve body V2 and the valve lid V4 by opening the valves 19 and 19 and passing a dry gas from one of them.

When the on-off valve V is disassembled,
It is possible to confirm the airtightness of the valve box casing 2, the shutoff valve 4, the valve lid casing 5 and the casing lid 7,
Further, it is possible to confirm the airtightness when the shutoff valve 4 is closed, and further, at the time of assembling the opening / closing valve V, the airtightness of the airtight fixing of the valve lid casing 5 and the casing lid 7 can be confirmed. Can be confirmed by the pressure gauge 21 by the introduction of the dry gas, and the location of the airtight leakage can be confirmed only by applying the foaming liquid, so that the leakage of the pressure fluid of the live line is prevented in the disassembling work and the assembling work of the live line valve. be able to.

Further, when the opening / closing valve V is disassembled, the valve box V1, the shutoff valve 4, the valve body V2 and the valve lid V4 can be dried, and when the opening / closing valve V is assembled, the valve body V2 and the valve Since the lid V4 can be dried, in the disassembling work and the assembling work of the live line valve, the dew condensation on the valve box V1, the valve body V2, the valve lid V4 and the shutoff valve 4 or the icing in the cold is eliminated. Therefore, the work can be performed smoothly, and the shutoff performance of the on-off valve V after assembly can be improved.
Furthermore, after assembly, the cock 17 or 19 of the nozzle 18 or 20 provided in the valve box casing 2 or the valve lid casing 5 can be opened to check the leakage of the pressure fluid of the on-off valve V during assembly. it can.

According to the disassembling / repairing jig and the disassembling / repairing method for removing the valve lid V4 including the valve body V2 which is the pressure resistant component of the present invention, the shutoff valve 4 is provided for the valve lid V4 and the valve body V2. The valve lid V4 and the valve body V2 can be released from the pressure resistance by disconnecting from the valve box V1 by the above, and the valve lid V4 and the valve body V2 can be easily removed. It is possible to easily replace or repair the pressure-resistant parts of the open / close valve V under pressure.

The removed valve lid V4 and valve body V2 that require repair are repaired by ordinary means, but the valve seat and gasket seat of the valve box V1 are not covered by the casing lid 7. Is separated from the valve lid casing 5 (see FIG. 4).
It is repaired by using the disassembly / repair jig of (state). That is, in the valve lid casing 5 of this disassembly / repair jig, a transparent lid having the same size as the casing lid 7, a rotary shaft slidably and rotatably supported at the center of the transparent lid, and a rotary shaft. The transparent lid of the valve seat sliding jig or the gasket seat sliding jig, which is provided with the slidable body at the tip and the handle at the base, is airtightly fixed, and the shut-off valve 4 is opened. It is possible to repair the valve seat or the gasket seat of the valve box V1 while seeing through. After repairing the valve seat or the gasket seat of the valve box V1, the valve seat sliding jig or the gasket seat sliding jig is pulled up into the valve lid casing 5, the shutoff valve 4 is closed, and the transparent lid is closed. After dissociating from the casing 5, a transparent lid, in which a copper pipe communicating with a tube leading to a suction source is airtightly inserted, is airtightly fixed to the valve lid casing 5, and the shutoff valve 4 is opened. Alternatively, the sliding slag generated by the repair with the gasket seat sliding jig can be sucked and removed with a copper pipe while seeing through the inside of the transparent lid.

[0038]

EFFECT OF THE INVENTION A disassembly / repair jig and its disassembly / disassembly tool used for removing work of a valve lid including a valve body which is a pressure resistant component of the present invention.
The repair method is constructed as described above, and the valve body and valve lid are sealed with the valve lid temporarily fastened with the temporary fastening bolts, and the fastening of the temporary fastening bolts is released from the outside of the sealed area to remove the valve body. The valve lid including the valve lid can be disengaged from the valve box, and the valve lid and the valve body can be separated from the valve box at the same time in the sealed region, and the valve lid and the valve disk are shut off from the valve box by the shutoff valve. As a result, the valve lid and the valve body can be released from the pressure resistance, so that the valve lid including the valve body which is the pressure resistant component can be easily removed from the open / close valve interposed in the live line piping under pressure. The removed valve body and valve lid can be repaired or replaced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional explanatory view showing a state in which a valve lid of an on-off valve is temporarily fastened with a temporary fastening bolt and a valve box casing is airtightly fixed to a live line pipe in a method for disassembling and repairing a live line valve according to the present invention. Is.

FIG. 2 is a partial cross-sectional view showing a state in which the valve lid attaching / detaching mechanism and the casing lid are airtightly fixed and the valve box and the valve lid are sealed from the state of FIG. 1 in the method of disassembling / repairing a live line valve according to the present invention. FIG.

FIG. 3 is a partial cross-sectional explanatory view showing a state in which the valve lid including the valve body and the temporary fastening bolt are pulled up and the shutoff valve is closed from the state of FIG. 2 in the method for disassembling and repairing the live line valve according to the present invention. .

FIG. 4 is a partial cross-sectional explanatory view showing a state where the valve lid including the valve body is removed together with the casing lid in the method for disassembling / repairing the live line valve according to the present invention.

FIG. 5 is a plan view showing a state in which a shutoff valve of the valve lid attaching / detaching mechanism is closed.

FIG. 6 is a vertical cross-sectional side view showing a state in which a shutoff valve of the valve lid attaching / detaching mechanism is closed.

FIG. 7 is a partial cross-sectional explanatory view of an opening / closing valve interposed in a live line pipe.

FIG. 8 is an explanatory diagram of a conventional live line valve repairing method.

[Explanation of symbols]

1 ... Temporary tightening bolt 2 ... Upper and lower split type valve box casing 4 ... Shut-off valve 5: Valve lid casing 6 ... Valve lid attachment / detachment mechanism 7: Left and right split type casing lid 8 ・ ・ ・ Valve lid insertion hole 9 ・ ・ ・ Insertion hole for temporary tightening bolt 17, 19 ・ ・ ・ Cock 18, 20 ・ ・ ・ Nozzle 21 ... Pressure gauge 22 ・ ・ ・ Communication pipe V: open / close valve V1 ... Valve box V2 ... Valve V4 ... Valve lid P ・ ・ ・ Piping

Continued front page    (72) Inventor Hiroyuki Takahashi             3 2-3 Hisamoto, Takatsu-ku, Kawasaki City, Kanagawa Prefecture               Hirata Valve Industry Co., Ltd. (72) Inventor Taizo Hoshino             121-1 Tado, Horinouchi Town, Kitauonuma District, Niigata Prefecture               Hirata Valve Industry Co., Ltd. Niigata Office F-term (reference) 3C031 EE21                 3H066 AA01 BA18

Claims (5)

[Claims] 1. A jig used for disassembling and repairing an on-off valve installed in a live line pipe, the valve lid of the on-off valve being replaced with a lid bolt for fastening the valve lid. A temporary tightening bolt having a long head for fastening, and a valve box casing that surrounds the valve box of the on-off valve and is detachably and airtightly fixed to the live line piping so that the upper and lower parts are open. Consisting of a shut-off valve that can be opened and closed and a valve lid casing that is mounted on the upper side of the shut-off valve and has an open upper portion, and the lower side of the shut-off valve is detachably airtightly fixed to the upper peripheral edge of the valve casing. Valve lid removing mechanism, and a left and right two-part split casing lid that has respective insertion holes through which the valve lid and the temporary tightening bolt are respectively inserted in an airtight manner, and is detachably and airtightly fixed to the upper peripheral edge of the valve lid casing. , A live line valve characterized by Disassemble, repair jig. 2. The valve box casing and the valve lid casing are provided with two nozzles each having a cock, and one of the nozzles of the valve lid casing is connected with a pressure gauge. The disassembling / repairing jig for the live line valve according to claim 1, wherein pipes are continuously provided. 3. A method of disassembling and repairing an on-off valve interposed in a live line pipe, wherein a lid bolt for fastening a valve lid of the on-off valve is replaced with a temporary fastening bolt having a long head. Then, the first step of temporarily tightening the valve lid with the temporary tightening bolt is performed, and the valve box of the on-off valve is enclosed by being sandwiched by the valve box casings of the upper and lower two-divided type whose upper part is open. Step for removably and airtightly fixing the valve to the live line pipe, a valve lid detachable mechanism including an openable and closable shutoff valve, and a valve lid casing mounted on the upper side of the shutoff valve and having an open top. Through the open / close valve with the shutoff valve open.
Third detachably and airtightly fixed to the upper edge of the valve casing
And the left and right halves of the casing lid having the through holes for the valve lid and the temporary tightening bolt, and the valve lid and the temporary tightening bolt are airtightly inserted through the through holes, respectively. The fourth step of removably and airtightly fixing, the valve body of the on-off valve is fully opened, and the temporary fastening of the temporary tightening bolt is released, and the valve lid including the valve body and the temporary tightening bolt are positioned inside the valve lid casing. The fifth step of closing the shut-off valve to close the valve lid and the valve body from the pressure resistance, and separating the left and right two-way split casing lid from the valve lid casing to include the casing lid in the valve body. The sixth step of removing the valve lid and the temporary fastening bolt from the valve lid casing and the assembling of the valve lid including the repaired or replaced valve body into the valve box are performed from the first step of temporarily fastening the valve lid to the above. Until the casing lid is removed from the valve lid casing A seventh step of assembling by a reverse step of the sixth step, and a method for disassembling and repairing a live line valve, the method comprising: 4. After the completion of the fourth step, a cock of a nozzle provided with a pressure gauge provided in the valve lid casing is opened, and a dry gas is introduced to pressurize the valve to a pressure higher than the live line pressure. The step of confirming the airtightness of the casing, the shutoff valve, the valve lid casing and the casing lid, and the closing of the shutoff valve in the fifth step, and then the cock of one nozzle provided in the valve lid casing is opened. Then, before the opening of the shutoff valve in the step of confirming the airtightness of the shutoff valve and the step of assembling the valve lid including the repaired or replaced valve body in the valve box in the seventh step, the shutoff valve is provided on the valve lid casing. Open the cock of the nozzle equipped with a pressure gauge, introduce dry gas to pressurize above the live line pressure, and check the airtightness of the valve lid casing and the casing lid. Disassembly and repair method of the active line valve according to claim 3, symptoms. 5. Before closing the shutoff valve in the fifth step, any two cocks of nozzles provided in the valve box casing and the valve lid casing are opened, and dry gas is conducted from one of them. The valve box, the shutoff valve, the valve body and the valve lid, and the opening of the shutoff valve in the step of assembling the valve lid including the repaired or replaced valve body into the valve box in the seventh step. A step of opening the cocks of the two nozzles provided in the valve lid casing, and conducting the dry gas from one of them to dry the valve body and the valve lid. The method for disassembling / repairing a live line valve according to claim 3 or 4.