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Spherical valve overhaul sealing control method

A control method and inspection and sealing technology, which is applied to valve details, valve devices, and valve housing structures, can solve the problems that it is difficult to realize the inspection and maintenance seal, and cannot guarantee that the inspection and maintenance seal will not be opened, so as to improve the safety of inspection and maintenance. Effect

Active Publication Date: 2018-03-30
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing technologies represented by the above-mentioned patent documents are not easy to realize the free throwing and withdrawing of the maintenance seal under the normal maintenance state, and cannot guarantee that the maintenance seal will not be opened when misoperation occurs

Method used

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  • Spherical valve overhaul sealing control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for overhauling and sealing a spherical valve comprises the following steps:

[0048] a. Set the area of ​​the opening chamber 9 of the movable sealing ring 4 in the spherical valve, the area of ​​the upstream high pressure chamber 10, the area of ​​the upstream input chamber 8 and the area of ​​the downstream pressure chamber 11. The area of ​​the upstream high pressure chamber 10 is larger than the area of ​​the opening chamber 9 and the area of ​​the upstream input chamber 8 is greater than the area of ​​the open chamber 9, and the sum of the area of ​​the open chamber 9 and the area of ​​the downstream pressure chamber 11 which is 0.7 times greater than the area of ​​the upstream high pressure chamber 10;

[0049] b. For normal maintenance, when the turbine is shut down, the valve 5 of the spherical valve is fully closed through the servomotor 6, and the movable sealing ring 4 is put into the water, and the water in the downstream pipeline of the spherical v...

Embodiment 2

[0054] A method for overhauling and sealing a spherical valve comprises the following steps:

[0055] a. Set the area of ​​the opening chamber 9 of the movable sealing ring 4 in the spherical valve, the area of ​​the upstream high pressure chamber 10, the area of ​​the upstream input chamber 8 and the area of ​​the downstream pressure chamber 11. The area of ​​the upstream high pressure chamber 10 is larger than the area of ​​the opening chamber 9 and the area of ​​the upstream input chamber 8 is greater than the area of ​​the open chamber 9, and the sum of the area of ​​the open chamber 9 and the area of ​​the downstream pressure chamber 11 which is 0.7 times greater than the area of ​​the upstream high pressure chamber 10;

[0056] b. For normal maintenance, when the turbine is shut down, the valve 5 of the spherical valve is fully closed through the servomotor 6, and the movable sealing ring 4 is put into the water, and the water in the downstream pipeline of the spherical v...

Embodiment 3

[0062] A method for overhauling and sealing a spherical valve comprises the following steps:

[0063] a. Set the area of ​​the opening chamber 9 of the movable sealing ring 4 in the spherical valve, the area of ​​the upstream high pressure chamber 10, the area of ​​the upstream input chamber 8 and the area of ​​the downstream pressure chamber 11. The area of ​​the upstream high pressure chamber 10 is larger than the area of ​​the opening chamber 9 and the area of ​​the upstream input chamber 8 is greater than the area of ​​the open chamber 9, and the sum of the area of ​​the open chamber 9 and the area of ​​the downstream pressure chamber 11 which is 0.7 times greater than the area of ​​the upstream high pressure chamber 10;

[0064] b. For normal maintenance, when the turbine is shut down, the valve 5 of the spherical valve is fully closed through the servomotor 6, and the movable sealing ring 4 is put into the water, and the water in the downstream pipeline of the spherical v...

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Abstract

The invention discloses a spherical valve overhaul sealing control method which is characterized in that the spherical valve overhaul sealing control method comprises the following steps that a, the area of an opening cavity of a movable sealing ring in a spherical valve, the area of an upstream high pressure cavity, the area of an upstream input cavity and the area of a downstream pressure cavityare set; b, normal overhaul is carried out, a water turbine is shut down, a valve body of the spherical valve is fully closed through a servomotor, the movable sealing ring is put in, water in a downstream pipeline of the spherical valve is drained, and the movable sealing ring is pressed under the pressure of the upstream input cavity and the pressure of the upstream high pressure cavity; c, extreme overhaul is carried out, the upstream input cavity is subjected to pressure loss, the opening cavity is subjected to pressure buildup, and the movable sealing ring is pressed; and d, after the overhaul, a by-pass line is opened for carrying out pressure balance on the upstream side and the downstream side of the spherical valve. The free input and withdrawing of overhaul sealing in a normal overhaul state can be realized, the situation that the overhaul sealing is not opened during misoperation can be guaranteed, the safety of a maintainer is ensured, and the spherical valve overhaul sealing control method has the characteristics of convenience in operation, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of water turbines, in particular to a method for checking and sealing a spherical valve. Background technique [0002] When the unit or spherical valve is overhauled, if the input chamber of the inspection seal loses pressure due to misoperation, the opening chamber builds up pressure and the mechanical lock is not put in, the inspection seal may be opened at this time, causing a safety accident in the power station. [0003] According to the needs of the power station, during the maintenance process of the working seal of the unit or the spherical valve, the spherical valve maintenance seal should have a "no pressure state on the downstream side of the spherical valve" in addition to the normal function of being able to put sealing water in the normal state and absolutely guarantee the safety of the maintenance personnel. When checking the anti-opening self-locking function after the seal exits the cavity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K5/06F16K5/08F16K27/06
CPCF16K5/0663F16K5/08F16K27/067
Inventor 黄玺文树洁刘礼政林洪德张议张洪
Owner DONGFANG ELECTRIC MACHINERY
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