Cv Value For Control Valve

The definition of cv factor is the number of gpm (gallons per minute) that will pass through a control valve with a pressure drop of one (1) psi.

Cv value for control valve. Valves are tested by running water through it before publishing the cv value. Please contact us if the fluid specification requires viscosity correction. Gallons per minute of water which will pass through a given flow restriction with a pressure drop of 1 psi.

The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as: The use of this flow coefficient (c v) calculator leads to a standard calculation to compare valve capacities. Flow calculations and cv values the valve coefficient, cv, is a number which represents the capability of a valve (or any flow component) to flow a fluid.

The definition of cv is the number of gpm (gallons per minute ) that will pass through the control valve with a pressure drop of 1psi. Kv = 0.865 · cv cv = 1,156 · kv (equivalence between flow coefficients kv and cv) For a specific control valve, flow coefficient cv/kv is determined experimentally by control valve manufacturers, and you can found it in manufacturers technical specifications.

In simple terms, a fully open control valve with a cv of 14 usgpm/psi passes 14 usgpm of fluid with 1 psi pressure drop. The density of water at. ※2 calculation of viscosity correction is necessary when the fluid is liquid and the kinematic viscosity is 20 mpa・s or more and the calculated cv value is 0.01 or less.

The density of water at 15°c is 999.13 kg/m 3. The flow rate for a liquid q = cv * sq. Founded at 1980, value valves co., ltd.

A control valve may be Pressure profile fluid flowing through a control valve obeys the basic laws of conservation of mass and energy, and the The formula will differ depending on the product the valve regulates, such as liquid, gas, or steam.