Tech Info - Cole-Parmer

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Cv to scfm Conversion

AIR

Q: What does "Cv" mean?

CONTROL A: Cv is defined as the coefficient of

VALVE

velocity. The Cv value is generally

used to compare flows of valves. The

Cv

higher the Cv, the greater the flow.

It is sometimes helpful to convert Cv into scfm (standard cubic feet per minute) and conversely, scfm into Cv. Although Cv represents flow capacity at all pressures, scfm represents flow at a specific air pressure. Therefore, the following chart relates Cv to scfm at a group of pressures.

To obtain scfm output at a particular pressure, divide the valve Cv by the appropriate factor shown below.

Cv to scfm Conversion Factor Table

psi of Air Pressure

40

50

Factor

0.0370 0.0312

60 0.0270

70 0.0238

80 0.0212

90 0.0192

100 0.0177

Example: What is the output in scfm of a value with a Cv of 0.48 when operated at 100 psi?

0.48 (Cv)

= 27 scfm

0.0177 (Factor)

To convert scfm into Cv, simply reverse the process and multiply the scfm times the factor.

27 (scfm) 0.0177 (Factor) = 0.48 Cv

3094V.1

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