Estimate air flow through a valve with known Cv.
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Use the Pneumatic Valve Flow From Cv Calculator to estimate air flow through a valve with known Cv. The calculator uses Valve Cv, Upstream absolute pressure, Downstream absolute pressure, Air temperature and Gas specific gravity (air=1) and reports flow rate; choked status.
Read the result in the context of the selected units and pressure basis. For this tool, the primary outputs are flow rate; choked status. Change one input at a time when comparing scenarios so the effect of each variable remains clear.
PneumaForge applies this verified method: Compressible gas Cv relation. The functional engine is shared with related tools in the gas-cv family, while this page solves the specific intent represented by air flow through Cv calculator.
Compressible gas Cv relationReproducible example: start with the calculator's default values (Valve Cv = 1; 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 flow rate; choked status 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 estimate air flow through a valve with known Cv. The reported outputs are flow rate; choked status.
The calculator uses Valve Cv, 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 Cv relation. 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.