Selection of nitrogen pipeline valves, nitrogen sealing, cost-effectiveness
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The reaction vessel requires nitrogen protection; I would like to choose a valve for use with nitrogen as the medium. It should automatically supply nitrogen when the pressure in the reaction vessel falls below 1 kilogram, and it can be set to shut off automatically when the pressure approaches 0.8 kilograms； With a diameter of DN15–20mm, self-acting control valves are the usual choice. My question is: are there any cheaper valve types that can be used as alternatives?
This must be the most cost-effective valve, right? @GuanGongYu @ylb913