Valve Flow Coefficient Cv / Kv
Valve flow coefficient, abbreviared as \(C_v\), also called valve sizing coefficient, a dimensionless number, uses imperial units. The number of \(\frac{gal}{min}\) of water at 60°F that will flow through a valve in one minute when the pressure differential across the valve is 1 \(\frac{lbf}{in^2}\) (psi).
Valve flow factor, abbreviared as \(K_v\), a dimensionless number, uses imperial units. The number of \(\frac{L}{min}\) of water between 5°C - 30°C that will flow through a valve in \(\frac{m^3}{hr}\) with a pressure drop of 1 bar.
Valve Flow Coefficient CV / flow Factor KV Formulas |
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\(\large{ C_v = Q \sqrt{ \frac{SG}{\Delta P} } }\) \(\large{ K_v = Q \sqrt{ \frac{SG}{\Delta P} } }\) |
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Symbol | English | Metric |
\(\large{ C_v }\) = valve flow coefficient | \(\large{ dimensionless }\) | |
\(\large{ K_v }\) = valve flow factor | \(\large{ dimensionless }\) | |
\(\large{ Q }\) = valve flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) |
\(\large{ \Delta P }\) = valve pressure differential | \(\large{\frac{lbf}{in^2}}\) | \(\large{\frac{N}{m^2}}\) |
\(\large{ SG }\) = specific gravity of fluid | \(\large{ dimensionless }\) |
Tags: Pressure Equations Coefficient Equations Flow Equations Valve Equations Valve Sizing Equations