Cv Factor For Valves

It is defined as the flow rate in us gallons per minute [gpm] of water at a temperature of 60º fahrenheit with a pressure drop across the valve of 1 psi. The full closure curve of a ball valve is then the above graph multiplied by the valve’s flow coefficient or factor. 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.

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A valve with a high cv passes fluid more easily than one with a low cv.

Cv factor for valves. Butterfly valve cv values vary with the disc angle and valve size. Valves are tested by running water through it before publishing the cv value. Cv flow coefficient ratings have several advantages:

They provide a means of comparing the flow capacities of different brands of valves; The below cv values are used to give an indication of flow rates for ball valves. The valve flow coefficient, cv, is the number of u.s.

Control valve cv refers to the flow coefficient of the valve. However, there is a problem with using this equation in pneumatic applications. Flow coefficients cv values the flow coefficiency (cv) of a valve is the rate of gallons per minute of water at 60° f through a fully opened valve at a pressure drop of 1 psi across the valve.

For example, a valve with cv of 4.00 will pass 4 times as much flow at the same pressure difference as shown in the chart. Sometimes, the cv value is given instead of the kv value. Q = cv x δp x 62.4 d the formula above utilizes a conversion factor of 62.4 which is the density of water in lbs/ft³.

The cv value of.0141 is reached at approximately turn 2.3, while the cv value of.0703 is reached at approximately turn 14.6. The conversion factor between two coefficients is indicated with arrows. Converting between flow coefficient c v and flow.

Cv vs angle closure curve values table. Cv is based on the volume flow rate of water at 60°f through a device within one minute at a 1 psi differential. The equations below can be used to determine: