In the liquid nitrogen washing process for synthetic ammonia production, are three-eccentric valve designs used instead of ball valves with track mechanisms in molecular sieve cut-off valves?/
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In the ammonia synthesis liquid nitrogen washing process, are there molecular sieve isolation valves that use triple-eccentric valves instead of ball valves???
It seems not; under extremely low temperatures, a triple eccentric design is not suitable. A ball valve of good quality will do
In deep-cold environments with a liquid nitrogen medium and temperatures of -196 degrees Celsius, it is better to use ultra-low temperature top-mounted ball valves from original imported brands.
Using triple-eccentric and other similar conventional valves is not suitable, as 1. they operate frequently. 2. During regeneration and operation, the large temperature difference between hot and cold causes the packing seal components to contract and expand, resulting in leaks.