System and method for detecting gas tightness of low-temperature stop valve

Abstract

The invention discloses a system for detecting gas tightness of a low-temperature stop valve. The system comprises a detection gas source, a gas pressure reduction device, a low-temperature liquid nitrogen tank and a photoelectric measurement instrument; the detection gas source is connected with a filter, the stop valve, a pressure reduction valve and a pneumatic valve which are sequentially arranged; the pneumatic valve is connected with an inlet of the low-temperature stop valve; the low-temperature stop valve is arranged in the low-temperature liquid nitrogen tank; an outlet of the low-temperature stop valve is connected with a measurement pipe; the measurement pipe is inserted in water; and the photoelectric measurement instrument measures gas bubbles at a pipe orifice of the measurement pipe. The system adopts a detection mode of replacing helium with nitrogen, and replaces a helium detector with the photoelectric measurement instrument, so that when cost is reduced, reliabilityis improved.

Description

technical field [0001] The invention relates to the field of valve detection, in particular to a system and method for detecting air tightness of a low-temperature stop valve. Background technique [0002] With the continuous progress and development of industrial modernization, people are more inclined to use high-efficiency and high-precision detection methods. [0003] The current valve measurement systems are all helium detection devices, which have the following disadvantages: [0004] (1) The cost is high, the cost of the valve testing equipment helium leak detector is high, and the cost of using the detection medium helium is high; [0005] (2) The maintenance requirements for testing equipment are high, and it is not convenient for long-term use; [0006] (3) Due to the spread of helium gas during the inspection process, the measurement of the helium detector is inaccurate; [0007] (4) The inspection process is cumbersome; [0008] Aiming at the problems in the ...

AI Technical Summary

Problems solved by technology

[0004] (1) The cost is high, the cost of the valve testing equipment helium leak detector is high, and the cost of using the detection medium helium is high;

[0005] (2) The maintenance requirements for testing equipment are high, and it is not convenient for long-term use;

[0006] (3) Due to the spread of helium gas during the inspection process, the measurement of the helium detector is inaccurate;

[0007] (4) The inspection process is cumbersome;

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