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Disassembly and installation method of a Y-type lifting check valve

An installation method and check valve technology, applied in the direction of hand-held tools, manufacturing tools, etc., can solve the problems that cannot be tightened by torque, cannot be disassembled by ordinary tools, etc.

Active Publication Date: 2020-12-18
SANMEN NUCLEAR POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Torque tightening is not possible as there is no point of force on the piston
[0005] Therefore, it is impossible to disassemble and assemble with ordinary tools.

Method used

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  • Disassembly and installation method of a Y-type lifting check valve
  • Disassembly and installation method of a Y-type lifting check valve
  • Disassembly and installation method of a Y-type lifting check valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a special tool that can be used for the installation and disassembly of the large-diameter Y-type lift check valve, and is mainly used for the disassembly and assembly of the AP1000 main water supply check valve. The special tools include: a valve core tube extension tool 1 and a piston extension tool 2 .

[0029] The spool tube extending tool is tubular as a whole and includes a bottom plate 11 for connecting with the spool tube of the check valve and a tube body 12 installed on the bottom plate 11 . Such as image 3 In this embodiment, the base plate 11 is a steel plate, and the pipe body 12 is a stainless steel tube and is welded on the base plate 11 . Four through holes are processed on the upper part of the stainless steel pipe body 12 as installation holes 121 for installing the operation structure. The operating structure can be a handle, a shackle or a sling, etc., which are used for hoisting the valve core pipe. The operating structu...

Embodiment 2

[0048] This embodiment provides a special tool that can be used for the installation and disassembly of the large-diameter Y-type lift check valve, and is mainly used for the disassembly and assembly of the AP1000 main water supply check valve. On the basis of the above embodiment, the special tool of this embodiment further includes a snap ring 3 for being installed in the annular positioning groove of the check valve so as to fill up the annular positioning groove. Such as figure 2 The snap ring 3 in this embodiment is a stainless steel ring cut into multiple arc segments, which is convenient for installation. The pressure sealing cover of the self-sealing bonnet of the check valve is installed inside the valve body, and is limited by a sealing snap ring, and the sealing ring is installed between the sealing snap ring and the pressure sealing cover. The sealing snap ring is installed in the annular positioning groove in the valve cavity, and the piston can only be disassem...

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Abstract

The invention belongs to the technical field of AP1000 nuclear power plant large-caliber Y-shaped lifting type check valve maintenance, and particularly relates to a Y-shaped lifting type check valvedismounting and mounting method mainly used for dismounting and mounting an AP1000 main water supply check valve. By designing and manufacturing a valve element pipe extension tool, a piston extensiontool, a dismounting and mounting special clamping ring, a torque fastening tool and the like, the valve can be rapidly and effectively dismounted and mounted, and the problem that the AP1000 large-caliber Y-shaped lifting type check valve cannot be dismounted and mounted is solved.

Description

technical field [0001] The invention belongs to the technical field of overhauling large-diameter Y-type lifting check valves of AP1000 nuclear power plants, and specifically relates to a disassembly and installation method for Y-type lifting check valves, which are mainly used for disassembly and assembly of AP1000 main water supply check valves. Background technique [0002] During the commissioning and operation of nuclear power plants, the main water supply check valve is the most important check valve in the main water supply system and the secondary circuit. It is required to provide the main water supply channel when the SG is in normal operation, and prevent the SG from being secondary when the main water supply pipeline is broken or the feedwater pump trips. Secondary side water backflow. Therefore, it is necessary for the valve to realize automatic opening and closing under these two working conditions. If the valve cannot be opened normally, the system will not b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B27/14
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
Owner SANMEN NUCLEAR POWER CO LTD