CN209986899U - Y-shaped lifting check valve dismounting tool - Google Patents

Y-shaped lifting check valve dismounting tool Download PDF

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Publication number
CN209986899U
CN209986899U CN201920456928.9U CN201920456928U CN209986899U CN 209986899 U CN209986899 U CN 209986899U CN 201920456928 U CN201920456928 U CN 201920456928U CN 209986899 U CN209986899 U CN 209986899U
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China
Prior art keywords
piston
tool
check valve
valve
extension tool
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CN201920456928.9U
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Chinese (zh)
Inventor
谭进
金飞
韩杰
焦守超
阮杭浙
裴学强
廖明
蒋文结
甘万忺
夏崧浩
孙正旭
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Three Gate Nuclear Power Co Ltd
Sanmen Nuclear Power Co Ltd
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Three Gate Nuclear Power Co Ltd
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Abstract

The utility model belongs to the technical field of AP1000 nuclear power station heavy-calibre Y type over-and-under type check valve overhauls, specifically be a Y type over-and-under type check valve assembly and disassembly tools, mainly used AP1000 feedwater check valve's dismouting. The valve core pipe extension tool, the piston extension tool, the special clamping ring for dismounting and mounting, the torque fastening tool and the like are designed and manufactured. The disassembly and assembly work of the valve can be quickly and effectively finished, and the problem that the AP1000 large-caliber Y-shaped lifting check valve cannot be disassembled and assembled is solved.

Description

Y-shaped lifting check valve dismounting tool
Technical Field
The utility model belongs to the technical field of AP1000 nuclear power station heavy-calibre Y type over-and-under type check valve overhauls, specifically be a Y type over-and-under type check valve assembly and disassembly tools, mainly used AP1000 feedwater check valve's dismouting.
Background
During nuclear power plant commissioning and operation, the primary feedwater check valve, which is the most important check valve for the primary feedwater system and the secondary feedwater pump, is required to provide the primary feedwater path during normal operation of the SG, and to prevent backflow of water from the SG secondary side when the primary feedwater pipeline is broken or the feedwater pump trips, thus requiring the valve to open and close automatically under these two conditions.
The main water supply check valve is a large-caliber Y-shaped lifting check valve, the valve cover adopts a self-sealing form, the valve clack is similar to an inverted T shape, the top surface is a valve core sealing surface, the rear part is a valve core pipe, and the tail end of the valve core pipe is provided with a piston. The piston is in threaded connection with the valve core pipe and is fastened in torque, the valve body is similar to a cylinder body, and the piston and the valve core move up and down in the valve cavity together as the valve core is guided to open and close the valve. At present, no proper tool can realize the disassembly and the assembly of the valve.
Through the structure of analysis valve, the difficult point of concluding the dismouting has: 1. the piston is mounted on the valve core pipe at the rear part of the valve clack and is connected by threads. The piston is heavy, and when the valve is closed completely, the piston can be disassembled and assembled, so that the valve clack and the valve seat rotate mutually to generate friction to damage a sealing surface, and the piston can be disassembled and assembled without force points after the valve clack is lifted and separated from the valve seat. Can not be disassembled and assembled at all by manpower. 2. The piston is fastened, the piston is installed on the valve clack valve core pipe, torque fastening is needed, and the tightening torque is 135N/m. The piston has no force application point, and cannot be fastened by torque.
So that the disassembly and assembly cannot be performed at all using a general tool. In order to realize the disassembly and assembly of the main water supply check valve, a special tool needs to be developed, and the special tool can effectively realize the disassembly and assembly of the valve.
SUMMERY OF THE UTILITY MODEL
The invention aims to provide a special tool for mounting and dismounting a large-diameter Y-shaped lifting check valve, which is mainly used for mounting and dismounting an AP1000 main water supply check valve.
In order to solve the technical problem, the application provides a Y type over-and-under check valve assembly and disassembly tools, its characterized in that includes: the valve core pipe extension tool comprises a bottom plate and a pipe body, wherein the bottom plate is used for being connected with a valve core pipe of the check valve, and the pipe body is installed on the bottom plate; the piston extension tool comprises a cylinder body and a lower bottom plate arranged at the bottom of the cylinder body, wherein the lower bottom plate is used for being connected with a piston of a check valve and is provided with a through hole for the pipe body to pass through.
Preferably, the bottom plate is provided with a plurality of through holes for being in bolted connection with the valve core pipe.
Preferably, the pipe body is provided with a mounting hole for mounting an operating structure.
Preferably, the lower bottom plate is provided with a plurality of through holes for bolting with the piston.
Preferably, the barrel is provided with an operating handle.
Preferably, the piston extension tool further comprises an upper top plate mounting the top of the barrel; the upper top plate is provided with a through hole for the pipe body to pass through, and a torque fastening structure matched with a torque fastening tool is arranged at the through hole.
Preferably, the upper top plate comprises an outer ring, a middle ring and an inner ring; the outer ring is used for being connected with the barrel, the inner ring is provided with the torque fastening structure, and the middle ring is respectively in bolted connection with the outer ring and the inner ring.
Preferably, the disassembly and assembly tool further comprises a snap ring for mounting in the annular positioning groove of the check valve to fill the annular positioning groove.
Preferably, the snap ring is made of stainless steel and is divided into a plurality of independent arc-shaped sections.
The utility model discloses has following technological effect:
1. and the piston and the valve core pipe are respectively extended out of the valve cavity by the piston extension tool and the valve core pipe extension tool. When the valve core pipe extension tool is disassembled and assembled, the handle is sleeved in the shaft hole at the tail end of the valve core pipe extension tool, the fixed valve clack does not rotate, and the piston extension tool is rotated to drive the piston to rotate so as to realize the disassembly and assembly of the piston.
2. The moment fastening structure of the piston extension tool upper top plate can be matched with a moment fastening tool to realize the moment fastening of the piston, and the moment fastening problem of the piston is solved.
3. And after the sealing snap ring of the self-sealing cover of the water stop valve is taken out, the snap ring is arranged in the annular positioning groove and is filled with the annular positioning groove. The inner surface of the snap ring and the inner surface of the valve body are almost on the same cylindrical surface, and the inner wall of the whole valve body forms a complete inner cylindrical surface, so that the piston can freely move up and down.
Drawings
Fig. 1 is a piston disassembly and assembly view.
FIG. 2 shows the detachable snap ring.
Fig. 3 a spool tube extension tool.
FIG. 4 is a perspective view of the piston extension tool assembly.
41-valve body; 42-a valve core tube; 43-a lower locking ring; 44-a compacting plate; 45-a retaining ring; 46-connecting bolts; 47-a piston; 48-a piston ring; 3-a snap ring; 2-a piston extension tool; 1-valve core pipe extension tool.
Detailed Description
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that the conventional terms should be interpreted as having a meaning that is consistent with their meaning in the relevant art and this disclosure. This disclosure is to be considered as an example of the invention and is not intended to limit the invention to the particular embodiments.
Example one
The embodiment provides a specialized tool that can be used to installation and dismantlement of heavy-calibre Y type over-and-under check valve, mainly used AP1000 owner's water check valve's dismouting. This specialized tool includes: a spool tube extension tool 1 and a piston extension tool 2.
The valve core tube extension tool is generally tubular and comprises a bottom plate 11 for connecting with a valve core tube of the check valve and a tube body 12 mounted on the bottom plate 11. Referring to fig. 3, the base plate 11 is a steel plate, and the tubular body 12 is a stainless steel tube and is welded to the base plate 11. Four through holes are formed in the upper portion of the stainless steel pipe body 12 as mounting holes 121 for mounting an operating structure. The operating structure can be a handle, a shackle or a sling and other tools for hoisting the valve core pipe. The operating structure in this embodiment is a handle 122 that enables water to be inserted into the mounting hole 121, and the spool tube extension tool can be rotated horizontally or lifted upward by operating the handle. The bottom plate 11 in this embodiment is a circular plate, and the outer diameter of the bottom plate is slightly smaller than the diameter of the valve core tube, so that the bottom plate does not block the piston from moving up and down. Four through holes 111 are machined in the bottom plate 11 to align with four threaded holes in the check valve spool tube, and four bolts 112 are used to mount the spool tube extension tool to the spool tube when in use. The valve core tube extension tool is matched with the piston extension tool to disassemble and assemble the piston.
The piston extension tool 2 is cylindrical as a whole, and as shown in fig. 4, the main structure of the piston extension tool is composed of a cylinder 21, an upper top plate 22, a lower bottom plate 23 and two symmetrically arranged handles 24. An upper top plate 22 and a lower bottom plate 23 are provided at the top and bottom ends of the cylinder 21, respectively. The cylinder 1 of this embodiment is a stainless steel tube with a diameter of 355 × 5, and two handles 24 are symmetrically installed on the upper portion. The lower bottom plate 23 is used for connection with the piston of the check valve, and is provided with a through hole 231 through which the pipe body 12 of the spool pipe extension tool 1 passes, and a through hole 232 for bolting with the spool pipe. The lower bottom plate 23 in this embodiment is a steel ring with phi 406 × 190, and is connected to the stainless steel cylinder 1 by welding, and the inner diameter of the steel ring (i.e., the aperture of the through hole 231) is slightly larger than the outer diameter of the valve core tube, so that the piston extension tool (i.e., the tube body of the piston extension tool) can move up and down in the valve cavity without being restricted by the valve core tube and the valve core tube extension tool. Four through holes 232 are machined in the steel ring to align with the four threaded bores in the check valve piston and four bolts are used to mount the piston extension tool to the piston. The upper top plate 22 is provided with a through hole for the pipe body 12 of the valve core pipe extension tool 1 to pass through, and the through hole is provided with a torque fastening structure 2232 matched with the torque fastening tool, so that the torque fastening tool can perform torque fastening operations such as screwing, rotating and the like on the piston extension tool through the torque fastening structure in a matched manner. The upper top plate 22 in this embodiment includes an outer ring 221, a middle ring 222, and an inner ring 223. The outer diameter of the outer ring 221 is equal to the inner diameter of the cylinder 21, five lug plates 2211 are welded on the periphery of the outer ring of the upper top plate, and threaded holes are processed on the lug plates 2211. Meanwhile, five through holes 211 are formed in the cylinder 21 to correspond to the threaded holes in the lug plate 2211 one by one, and the upper top plate 221 is connected with the cylinder 21 through bolts. The middle ring 222 is a transition part between the outer ring 221 and the inner ring 223, and the outer ring 221, the middle ring 222, and the inner ring 223 are connected by bolts. The inner ring 223 is provided with a hexagonal head which cooperates with a torque wrench for torque tightening of the piston by the torque wrench. The inner ring 223 also serves as a through hole for the tube body of the valve core tube extension tool to pass through, so that the tube body of the valve core tube extension tool can pass through the piston extension tool through the lower bottom plate, the cylinder and the upper bottom plate.
By structural analysis of the AP1000 main feed water check valve. The main difficulty of disassembly and assembly lies in two aspects: 1, disassembling and assembling a piston; 2 the moment of the piston is tightened. The removal of the main water check valve is not possible at all without special tools. The special tool is used for solving the problems and realizing the disassembly and the assembly of the main water supply check valve.
A specific method for using the special tool in the present embodiment for disassembling the check valve is described below with reference to fig. 1, and the method includes:
step S01, the spool extension tool is mounted to and tightened against the spool tube of the check valve, and the piston extension tool is mounted to and tightened against the piston of the check valve. The method specifically comprises the following steps:
and step S011, connecting the bottom plate through hole of the valve core pipe extension tool with the corresponding screw hole bolt on the valve core pipe.
And step S012, connecting the lower bottom plate through hole of the piston extension tool with the corresponding screw hole on the piston through a bolt.
In step S02, the piston is rotated by the piston extension tool while the spool tube is fixed by the spool extension tool such that the piston is disengaged from the spool tube. In the step, firstly, a handle is inserted into a mounting hole of a valve core tube extension tool; then, the valve core pipe extension tool handle is screwed to prevent the valve core pipe extension tool from rotating so as to fix the valve clack and prevent the valve clack from rubbing with the valve seat to damage a sealing surface in the process of disassembling and assembling the piston; then the handle of the piston extension tool is held, the piston extension tool is rotated anticlockwise to drive the piston to rotate anticlockwise, and the piston is continuously rotated to enable the piston to be completely separated from the valve core tube.
And step S03, hanging the piston out of the valve body of the check valve, and completing the disassembly of the piston.
And step S04, hanging the valve core pipe out of the valve body of the check valve, and completing the disassembly of the valve core pipe.
As a preference of the present embodiment, the inner surface of the check valve is also cleaned before step S01 to keep its inner surface smooth so that the piston moves smoothly within the valve body.
A specific method for using the special tool in the present embodiment for installing the check valve is described below with reference to fig. 1, and the method includes:
step S11, the piston and the spool tube are hoisted into the valve body of the check valve.
Step S12, the spool tube extension tool is mounted and fastened to the spool tube of the check valve with bolts, and the piston extension tool is mounted and fastened to the piston of the check valve. The method specifically comprises the following steps:
and step S121, connecting the through hole of the bottom plate of the valve core pipe extension tool with the corresponding threaded hole on the valve core pipe through a bolt.
And step S122, connecting the lower bottom plate through hole of the piston extension tool with the corresponding screw hole bolt on the piston.
Step S13, the piston is rotated by the piston extension tool while the spool tube is fixed by the spool extension tool such that the piston is screwed with the spool tube. In the step, firstly, a handle is inserted into a mounting hole of a valve core tube extension tool; then, the valve core pipe extension tool handle is screwed to prevent the valve core pipe extension tool from rotating so as to fix the valve clack and prevent the valve clack from rubbing with the valve seat to damage a sealing surface in the process of disassembling and assembling the piston; and then, a handle of the piston extension tool is held, the piston extension tool is rotated clockwise to drive the piston to rotate clockwise, and the piston is continuously rotated to enable the piston to be completely screwed with the valve core tube. Preferably, the piston is tightened to the required torque directly using a torque wrench.
As a preference of the present embodiment, the inner surface of the check valve is also cleaned before step S11 to keep its inner surface smooth so that the piston moves smoothly within the valve body.
Example two
The embodiment provides a specialized tool that can be used to installation and dismantlement of heavy-calibre Y type over-and-under check valve, mainly used AP1000 owner's water check valve's dismouting. The special tool of the embodiment further comprises a clamping ring 3 which is used for being installed in the annular positioning groove of the check valve to fill the annular positioning groove. The snap ring 3 of the embodiment shown in fig. 2 is a stainless steel circular ring cut into a plurality of arc-shaped sections, which is convenient for installation. The pressure seal cover of the check valve self-sealing valve cover is arranged in the valve body and limited by a seal snap ring, and the seal ring is arranged between the seal snap ring and the pressure seal cover. The sealing snap ring is arranged in an annular positioning groove in the valve cavity, and the piston can be disassembled and assembled only after the sealing snap ring and the pressure sealing cover are taken out. When the piston is disassembled, the piston is easy to be clamped into the annular positioning groove where the original sealing snap ring is located, so that the piston cannot be taken out. The inner diameter of the snap ring 3 is the same as the inner diameter of the valve cavity, the outer diameter of the snap ring is slightly smaller than the annular positioning groove, and the width of the snap ring is equivalent to the width of the annular positioning groove. The snap ring 3 is cut into three arc-shaped sections for easy installation into the annular groove. After the sealed snap ring is taken out, the snap ring 3 is arranged in the annular positioning groove and is filled with the annular positioning groove. The annular positioning groove is filled, namely the inner surface of the clamping ring and the inner surface of the valve body are almost on the same cylindrical surface. So that the inner wall of the whole valve body forms a complete inner cylindrical surface to realize the free up-and-down movement of the piston.
A specific method for using the special tool in the present embodiment for disassembling the check valve is described below with reference to fig. 1, and the method includes:
in step S00, a snap ring is installed in the annular positioning groove of the check valve to fill the annular positioning groove. After the piston is conveniently separated from the valve core pipe, the piston is lifted out of the valve body.
Step S01, the spool extension tool is mounted to and tightened against the spool tube of the check valve, and the piston extension tool is mounted to and tightened against the piston of the check valve. The method specifically comprises the following steps:
and step S011, connecting the bottom plate through hole of the valve core pipe extension tool with the corresponding screw hole bolt on the valve core pipe.
And step S012, connecting the lower bottom plate through hole of the piston extension tool with the corresponding screw hole on the piston through a bolt.
In step S02, the piston is rotated by the piston extension tool while the spool tube is fixed by the spool extension tool such that the piston is disengaged from the spool tube. In the step, firstly, a handle is inserted into a mounting hole of a valve core tube extension tool; then, the valve core pipe extension tool handle is screwed to prevent the valve core pipe extension tool from rotating so as to fix the valve clack and prevent the valve clack from rubbing with the valve seat to damage a sealing surface in the process of disassembling and assembling the piston; then the handle of the piston extension tool is held, the piston extension tool is rotated anticlockwise to drive the piston to rotate anticlockwise, and the piston is continuously rotated to enable the piston to be completely separated from the valve core tube.
And step S03, hanging the piston out of the valve body of the check valve, and completing the disassembly of the piston.
And step S04, hanging the valve core pipe out of the valve body of the check valve, and completing the disassembly of the valve core pipe.
As a preference of the present embodiment, the inner surface of the check valve is also cleaned before step S01 to keep its inner surface smooth so that the piston moves smoothly within the valve body.
A specific method for using the special tool in the present embodiment for installing the check valve is described below with reference to fig. 1, and the method includes:
in step S10, a snap ring is installed in the annular positioning groove of the check valve to fill the annular positioning groove. The piston is conveniently hoisted into the valve body.
Step S11, the piston and the spool tube are hoisted into the valve body of the check valve.
Step S12, the spool tube extension tool is mounted and fastened to the spool tube of the check valve with bolts, and the piston extension tool is mounted and fastened to the piston of the check valve. The method specifically comprises the following steps:
and step S121, connecting the through hole of the bottom plate of the valve core pipe extension tool with the corresponding threaded hole on the valve core pipe through a bolt.
And step S122, connecting the lower bottom plate through hole of the piston extension tool with the corresponding screw hole bolt on the piston.
Step S13, the piston is rotated by the piston extension tool while the spool tube is fixed by the spool extension tool such that the piston is screwed with the spool tube. In the step, firstly, a handle is inserted into a mounting hole of a valve core tube extension tool; then, the valve core pipe extension tool handle is screwed to prevent the valve core pipe extension tool from rotating so as to fix the valve clack and prevent the valve clack from rubbing with the valve seat to damage a sealing surface in the process of disassembling and assembling the piston; and then, a handle of the piston extension tool is held, the piston extension tool is rotated clockwise to drive the piston to rotate clockwise, and the piston is continuously rotated to enable the piston to be completely screwed with the valve core tube. Preferably, the piston is tightened to the required torque directly using a torque wrench.
As a preference of the present embodiment, the inner surface of the check valve is also cleaned before step S11 to keep its inner surface smooth so that the piston moves smoothly within the valve body.
Although embodiments of the present invention have been described, various changes or modifications may be made by one of ordinary skill in the art within the scope of the appended claims.

Claims (9)

1. The utility model provides a Y type over-and-under check valve assembly and disassembly tools which characterized in that includes:
the valve core pipe extension tool comprises a bottom plate and a pipe body, wherein the bottom plate is used for being connected with a valve core pipe of the check valve, and the pipe body is installed on the bottom plate;
the piston extension tool comprises a cylinder body and a lower bottom plate arranged at the bottom of the cylinder body, wherein the lower bottom plate is used for being connected with a piston of a check valve and is provided with a through hole for the pipe body to pass through.
2. The tool of claim 1, wherein:
the bottom plate is provided with a plurality of through holes and is used for being connected with the valve core pipe through bolts.
3. The tool of claim 1, wherein:
the pipe body is provided with a mounting hole for mounting an operation structure.
4. The tool of claim 1, wherein:
the lower bottom plate is provided with a plurality of through holes for being connected with the piston bolts.
5. The tool of claim 1, wherein:
the barrel is provided with an operating handle.
6. The tool of claim 1, wherein:
the piston extension tool further comprises an upper top plate mounting the top of the barrel;
the upper top plate is provided with a through hole for the pipe body to pass through, and a torque fastening structure matched with a torque fastening tool is arranged at the through hole.
7. The tool of claim 6, wherein:
the upper top plate comprises an outer ring, a middle ring and an inner ring;
the outer ring is used for being connected with the barrel, the inner ring is provided with the torque fastening structure, and the middle ring is respectively in bolted connection with the outer ring and the inner ring.
8. The Y-shaped lift check valve disassembly tool of any one of claims 1-7, wherein:
the check valve further comprises a clamping ring which is used for being arranged in the annular positioning groove of the check valve to fill the annular positioning groove.
9. The tool of claim 8, wherein:
the snap ring is made of stainless steel and is divided into a plurality of independent arc-shaped sections.
CN201920456928.9U 2019-04-08 2019-04-08 Y-shaped lifting check valve dismounting tool Active CN209986899U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920456928.9U CN209986899U (en) 2019-04-08 2019-04-08 Y-shaped lifting check valve dismounting tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920456928.9U CN209986899U (en) 2019-04-08 2019-04-08 Y-shaped lifting check valve dismounting tool

Publications (1)

Publication Number Publication Date
CN209986899U true CN209986899U (en) 2020-01-24

Family

ID=69290986

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920456928.9U Active CN209986899U (en) 2019-04-08 2019-04-08 Y-shaped lifting check valve dismounting tool

Country Status (1)

Country Link
CN (1) CN209986899U (en)

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