Cv Value For Air. Cv = valve's flow coefficient (dimensionless value) s = specific gravity (1.0 for air or water) t = absolute temperature in °r (°r = °f + 460) p 1 = inlet pressure in psig δp = pressure differential in psi across valve in the open position v = specific volume in cubic feet per pound. Values are given in scfm (standard cubic feet per minute).
To find flow capacity of a valve, multiply its cv factor times the value shown in the chart. The ratio between cp and cv is the specific heat ratio, γ. If you want to calculate the cv value and flow rate outside of the specified units, please contact us.
For convenience, flow capacities for the most commonly used couplings are presented on graphs.
0.48 (cv) = 27 scfm 0. The higher the cv, the greater the flow. Cv to scfm conversion factor table psi of air pressure 40 50 60 70 80 90 100 factor 0.0370 0.0312 0.0270 0.0238 0.0212 0.0192 0.0177 example: Specific heat (c) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.
