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The working conditions of low-temperature valves are harsh, and most of their working media are flammable, explosive, and highly permeable substances. The minimum working temperature can reach -269 ¡æ, and the maximum working pressure can reach 10MPa. Therefore, there are significant differences in the design, manufacturing, and inspection of low-temperature valves compared to general-purpose valves. Generally, based on the operating conditions of low-temperature valves, the following requirements are proposed for design work:

(1) Valves and their assemblies should have the ability to operate for long periods of time in low-temperature media and ambient temperatures (typically 10 years or 35000-5000 cycles);

(2) Valves should not become a significant heat source compared to low-temperature media, as the inflow of heat can reduce thermal efficiency. Moreover, excessive heat inflow may cause the low-temperature media inside the valve to vaporize, resulting in abnormal pressure rise and danger;

(3) Low temperature media should not have harmful effects on the operating performance of the handwheel and the sealing performance of the filler;

(4) The structure of valve assemblies that come into direct contact with low-temperature media should comply with relevant explosion-proof and fire protection requirements;

(5) Valve assemblies that operate at low temperatures cannot be lubricated, so measures need to be taken to prevent friction components from being scratched.

The above requirements should be throughout the design process of low-temperature valves, and it should be noted that the above requirements are unique to low-temperature valves. During the design process of low-temperature valves, relevant general valve requirements should also be followed.