The nitrogen pressure is reduced from 15 M to 500. Dunyang is considered as a possible choice, but it offers both stainless steel and copper versions; no one can explain why there are two different materials available. Does the difference in material have any impact on its usage?
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The distributor in Dunyang can’t explain it themselves; it seems it’s because of the lower cost that two different materials are used
Reducing from 15 MPa directly to 500 kPa – shouldn’t it be done through multiple stages of pressure reduction? I remember that the control valve used to reduce the natural gas pressure from 8 Mpa to 400 kpa was a two-stage pressure reducer, with cast iron as its material.
I must have misunderstood; you were referring to the pressure relief valve of the gas cylinder, right? Sweat
It doesn’t matter for nitrogen; for the busbars and gas cylinders you mentioned, use pressure regulators. There are no valves designed specifically for nitrogen; instead, the metal material of the valves is chosen based on the operating conditions with oxygen, with copper and stainless steel being the most common choices. Either of these two cheap options will do. If money isn’t a concern, it’s best to choose copper. If it is to be used for oxygen in the future, it must be disassembled and degreased before use. Nitrogen doesn’t matter.