What does it mean that the oxygen system requires check valves to be impact-free check valves?
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What does it mean that the oxygen system requires check valves to be impact-free check valves? What is the form of a non-impact check valve?
There is a type called a slow-opening check valve, but those commonly used in oxygen pipelines have ordinary stainless steel valve bodies with copper valve cores. Later, there were also check valves with butterfly springs,,,,. I really have never seen a retarder-type used in oxygen processes.