Blowback type valve low-temperature test plugging device and method

Abstract

The invention relates to a device for a low-temperature test of a valve and particularly relates to a blowback valve low-temperature test plugging device. The invention further relates to a reverse blowing type valve low-temperature test plugging method based on the device, and aims to solve the problems that in the prior art, after cryogenic treatment is completed, residual liquid in an inner cavity of a valve can influence the measurement result of a low-temperature sealing test, and a valve inner cavity residual liquid treatment method commonly adopted at present is low in working efficiency and cannot obtain an accurate measurement value. According to the technical scheme, the blowback type valve low-temperature test plugging device is provided with a plugging plate, the plugging plateis provided with a first connector, a second connector, a third connector and a blowback pipe, and blowback is conducted through the blowback pipe to remove residual liquid in an inner cavity of a valve. The invention further provides a reverse blowing type valve low-temperature test plugging method which comprises the four steps of plugging device installation, cryogenic treatment deflation, residual liquid blowing 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 valves, in particular to a plugging device for back-blowing low-temperature test of valves. The present invention also relates to a low-temperature test plugging method for a blowback type 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 sealing test, it needs to conduct a sealing test at low temperature to verify the sealing performance of the valve under low temperature conditions. In the prior art, during the low temperature test of the valve, it is necessary to immerse the valve body in a low temperature medium for cryogenic treatment, so that the valve is cooled to the corresponding low temperature test temperature, and then perform the low temperature sealing test. In or...

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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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