The difference between a pressure relief valve and a pressure regulating valve
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The medium is nitrogen, and the pressure needs to be reduced from 0.6–0.7 MPA to 0.2 MPA. I’m not sure which valve to choose; I would appreciate it if a professional could help me conduct a comparative analysis of pressure reducing valves and pressure regulating valves in terms of cost and performance. Thank you.
Just use a Globe control valve – such low pressure, it’s so simple!
If flow regulation is not required, a self-acting pressure reducing valve can be chosen directly. If flow regulation is required, choose a control valve.
It’s sufficient to use a self-acting pressure regulator
If the pressure of the nitrogen source is stable, a pressure reducing valve will suffice.
After inquiring about prices, it was found that pressure relief valves are expensive while control valves are cheap. Pressure relief valves generally cost 3000+; control valves cost 1000+ (made of 316 material)
It seems that the pressure regulator mentioned in your question is a proportional pressure regulator; in that case, once the upstream pressure is stable, it’s possible to select a product with the appropriate parameters. The pressure regulator referred to in the question is likely one that offers greater ease of operation – after all, electric pressure regulators can control flow and pressure values, as well as have a shut-off function. Self-acting pressure regulators can also achieve precise control over the outlet flow rate in real time. The price you mentioned is probably the unit price of each of these two types of products. Considering the differences between the two products, I don’t think this price comparison is very representative
Self-acting control valves are quite good
The regulator works fine