Low temperature test plugging device and method for back-flushing valve

Abstract

The present invention relates to a device for low-temperature test of valves, in particular to a plugging device for low-temperature test of back-blowing valves, and also to a plugging method for low-temperature tests of back-blowing valves based on the above-mentioned device, so as to solve the problems of the prior art. After the cryogenic treatment is completed, the residual liquid in the valve cavity will affect the measurement results of the low-temperature sealing test. However, the current method of treating the residual liquid in the valve cavity is low in efficiency and cannot obtain accurate measurement values. The technical solution adopted is a back-blowing valve low-temperature test plugging device, which has a blocking plate, and the blocking plate is provided with a first joint, a second joint, a third joint, and a back-blowing pipe. liquid. The present invention also provides a low-temperature test plugging method for back-blowing valves, including four steps of installing a plugging device, degassing by cryogenic treatment, blowing off residual liquid, and low-temperature sealing test, so as to complete the low-temperature sealing test of the test valve body.

Description

technical field [0001] The invention relates to a device for low temperature test of valve, in particular to a backflushing valve low temperature test plugging device. The present invention also relates to a low-temperature test blocking method for a back-flushing valve based on the above-mentioned device. Background technique [0002] As an important control element of cryogenic pipelines, cryogenic valves have been widely used. Usually, after the low temperature valve has passed the normal temperature strength test and the tightness test, it is also necessary to carry out a sealing test at low temperature to check the sealing performance of the valve under low temperature conditions. In the prior art, in the low temperature test of the valve, the valve body needs to be immersed in a low temperature medium for cryogenic treatment, so that the valve is cooled to the corresponding low temperature test temperature, and then the low temperature sealing test is carried out. In...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem existing in the prior art that after the cryogenic treatment is completed, the residual liquid in the valve inner cavity will affect the measurement results of the low-temperature sealing test, but at present, the requirements of prolonging the low-temperature test time, natural return temperature volatilization at the outlet or increasing the leakage rate are usually adopted. and other methods to reduce the impact of residual liquid in the inner cavity on the measurement results, the work efficiency is low, and the technical problems of accurate measurement values ​​cannot be obtained, and a back-blowing valve low temperature test plugging device and method are provided.

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