Find Cv required for target air flow and allowable pressure drop.
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Use the Pneumatic Valve Cv Sizing Calculator to find Cv required for target air flow and allowable pressure drop. The calculator uses Required standard flow, Upstream absolute pressure, Downstream absolute pressure, Air temperature and Gas specific gravity (air=1) and reports required cv.
Read the result in the context of the selected units and pressure basis. For this tool, the primary outputs are required cv. Change one input at a time when comparing scenarios so the effect of each variable remains clear.
PneumaForge applies this verified method: Compressible gas valve sizing; choked/subcritical branch. The functional engine is shared with related tools in the gas-cv family, while this page solves the specific intent represented by pneumatic valve sizing calculator.
Compressible gas valve sizing; choked/subcritical branchReproducible example: start with the calculator's default values (Required standard flow = 1000; Upstream absolute pressure = 7.01325; Downstream absolute pressure = 1.01325; Air temperature = 20) and calculate the result. Then change the variable most relevant to your application and compare the new required cv against the baseline.
Legacy Cv engineering estimate, not a regulator-flow model. Absolute gas pressure required. Show convention and units prominently.
It is designed to find Cv required for target air flow and allowable pressure drop. The reported outputs are required cv.
The calculator uses Required standard flow, Upstream absolute pressure, Downstream absolute pressure, Air temperature and Gas specific gravity (air=1). Only use values that represent the same operating condition or design case.
The calculation follows: Compressible gas valve sizing; choked/subcritical branch. The page also states the assumptions that define where the method is valid.
Legacy Cv engineering estimate, not a regulator-flow model. Absolute gas pressure required. Show convention and units prominently.
Yes. PneumaForge converts supported units through canonical engineering units. For compressed-air reference flows and pressure bases, the reference pressure and temperature must also remain consistent.