How to choose a pressure relief valve
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The medium is argon; the inlet pressure is 7.8–8 kilograms per square centimeter, while the outlet pressure should be reduced to 6.5 kilograms per square centimeter. What model of pressure regulator should be used?
Argon is non-toxic in itself, but it can cause asphyxiation at high concentrations. When the argon concentration in the air is above 33%, that is, when the oxygen concentration is reduced by 2/3 or more compared to normal levels, there is a risk of asphyxiation. Severe symptoms occur when the argon concentration exceeds 50%, and death can happen within minutes at concentrations of over 75%. Therefore, it must not leak; there have been cases of death due to such leaks. Carbon steel can be used for the material, with zero leakage required. Ask the manufacturer with this, and it will be clear.
In outdoor environments, the requirements for sealing aren’t as strict, right?
Generally, the inlet pressure is not less than 2.5 times the outlet pressure; is a pressure regulator still necessary in this case? Wouldn’t a needle valve suffice? ? ?