CHOOSING THE CORRECT REGULATOR
In order to choose the correct regulator the following information is needed:
– Function: Pressure reducing or backpressure 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?
“Valve sizing” does not refer to the size of the end connections. It means determining how much flow can pass through the pressure regulator.
There is quite a difference in sizing regulators for gas or for liquids, because gases are compressible and liquids are not.

SWAGELOK (2010) HOW TO SIZE A PRESSURE REGULATOR

SWAGELOK (2010) HOW TO SIZE A PRESSURE REGULATOR
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