Running water prevention device in disassembling self-sealing check valve and operation method thereof

Abstract

The invention belongs to the technical field of mechanical assembly and particularly relates to a running water prevention device in disassembling a self-sealing check valve and an operation method thereof. The device comprises a clamping ring A, a clamping ring B, a limit bolt support arm, a limit tightening bolt, a fastening Bolt A and a fastening bolt B. The clamping ring A and the clamping ring B are fastened and connected by the fastening bolt A and the fastening bolt B. The limit bolt support arm is connected to the clamping ring A, and the limit tightening bolt is installed in the limitbolt support arm. According to the invention, the problem of running water in disassembling the self-sealing check valve of a nuclear power plant can be effectively solved, time and labor are saved,the problem of running water caused by a condition that a large number of mediums in the valve flow out in disassembling the self-sealing check valve of the nuclear power plant and maintenance personnel have no countermeasures is eliminated, and the risk of site pollution or the body surface contamination of personnel and the influence of continuous running water on system safety are reduced.

Description

technical field [0001] The invention belongs to the technical field of mechanical assembly, and in particular relates to a water-running prevention device and an operation method thereof when a self-sealing check valve is unloaded. Background technique [0002] Check valves are also called check valves, one-way valves, reverse flow valves, and back pressure valves. The check valve is used in the pipeline system. It is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline. It belongs to an automatic valve. media release. Check valves are also used on lines that supply auxiliary systems where the pressure may rise above system pressure. [0003] When the self-sealing check valve of a nuclear power plant is disassembled, there may be residual media in the system, or the problem of loose isolation boundaries, resulting in a continuous flow of residual media. These media are either radioactive or connected to the primary circuit...

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Problems solved by technology

[0005] The object of the present invention is to address the deficiencies of the above-mentioned prior art, to provide a self-sealing check valve anti-running device and its operation method when it is unloaded, which is used to solve the phenomenon of water run-out when the self-sealing check valve is disassembled and maintained in a nuclear power plant, causing the site Technical aspects of contamination or risk of radioactive contamination of operators

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