Valve Cv Formula Si Units. ※3 for p1 and p2, please use pressure close to the valve. Cv = 1.156 kv conversion of units for kv to cv.
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Symbol description units (notes) a flow passage area at the actual valve stroke mm2 c v flow coefficient u.s. Flow coefficient is an imperial measurement and is defined as: The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities.
Valves are tested by running water through it before publishing the cv value.
Kv = 1us gpm *sqrt (1/1psi) kv = 0.227125 m3/hr * sqrt (1/0.06894757 bar) kv = 0.2271 * 3.808 * m3/ hr. Equations displayed for easy reference. Kv = 1us gpm *sqrt (1/1psi) kv = 0.227125 m3/hr * sqrt (1/0.06894757 bar) kv = 0.2271 * 3.808 * m3/ hr. Q is the rate of flow (expressed in us gallons per minute), sg is the specific gravity of the fluid (for water = 1), δ p is the pressure drop across the valve.
