Here are some key points for cryogenic valve testing:
1. Low temperature environment setting: Determine the temperature range and duration of the low temperature test according to actual needs. Common low-temperature test temperatures are -40 degrees Celsius to -196 degrees Celsius. Low-temperature environments can be achieved through refrigeration equipment, liquid nitrogen, etc.
2. Sealing test: Carry out a sealing test in low temperature environment to detect the sealing performance of the valve. Usually includes air tightness test and a liquid tightness test. The leakage situation needs to be recorded during the test and evaluated according to the leakage volume requirements specified in the standard.
3. Impact resistance test: simulate the impact conditions in low temperature environment and test the impact resistance performance of the valve. Common methods are to use shock loads or vibration tables to conduct tests. According to standard requirements, check whether the valve is loose, cracked, or otherwise damaged during the impact process.
4. Cold resistance test: Conduct the opening and closing test of the valve in a low temperature environment to evaluate the normal working ability of the valve. During the test process, it is necessary to record the operating force, action time and other parameters of the valve, and check whether the valve has abnormal noise, stuck, etc.
5. Material performance testing: Test the physical and chemical properties of valve materials in low temperature environments. Including the tensile strength, impact toughness, hardness and other indicators of the material. This can evaluate the material's reliability and durability in low-temperature environments
6. Temperature regulation performance test: Test the temperature regulation performance of the valve under different low temperature conditions. Evaluate whether the valve can accurately control the temperature of the medium in a low temperature environment
7. Low temperature resistance cycle test: simulate the long-term use of the valve in a low temperature environment and conduct a cycle opening and closing test. According to the standard requirements, check whether there are air leakage, stuck and other problems in the valve during the circulation process.
