There is quite a difference in sizing regulators for gas or for liquids, because gases are compressible and liquids are not. Get this bulletin on correctly sizing pressure regulators.
Regulator sizing involves determining how much flow can pass through the pressure regulator. In order to choose the correct regulator the following information is needed:
Function: Pressure reducing or back pressure control?
Pressure: What are the maximum and minimum inlet and outlet pressure ranges?
Fluid: Is it a gas or a liquid?
Temperature: What is the operating temperature?
Flow: What are the flow requirements?
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Regulator sizing involves determining how much flow can pass through the pressure regulator. In order to choose the correct regulator the following information is needed: