Cv Value For Valves

Can anybody educate me on how i go about calculating cv coefficient values for relief valves. However, there is a problem with using this equation in pneumatic applications. The process of valve size selection, the same formula is used determine the valve cv necessary for a required flow rate and desired pressure drop.

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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.

Cv value 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 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: This is used as a guide and is not a linear progression.

Has been contributed to offer high quality product to the global market. The below cv values are used to give an indication of flow rates for ball valves. Butterfly valve cv values vary with the disc angle and valve size.

The valve flow coefficient cv or its metric equivalent kv has been adopted universally as a comparative value for measuring the capacity of control valves. Cv is based on the volume flow rate of water at 60°f through a device within one minute at a 1 psi differential. When you need to do valve sizing for your application, you need the cv to select the right valve.

Gallons per minute of water at 60°f that will flow through a control valve at a specified opening when a pressure differential of 1psi. Gpm cv value of cast swing check valve class size 150# 300# 600# 900# 1500# 2500# nps cv cv cv cv cv cv 1/2 11 11 11 11 11 8 3/4 24 24 24 20 20 13 Kv = 0.864 cv at a particular percentage of opening of valve giving cv = 1 will pass 1us gpm ( at 60 °f) and a pressure differential of 1 psi upstream and downstream across the valve.

I believe that kv is the metric equivalent to cv. Cv [gpm] [psi] nps (inches) dn (mm)full bore: Kv = 0.865 · cv cv = 1,156 · kv (equivalence between flow coefficients kv and cv)

In the chart below, we show the approximate cv value of butterfly valves ranging from 2 to 24 and at various disc angles. Many manufacturers around the world have adopted cv as the standard value to express the flow capacity of their components. Reserves the right to revise without notice.‐ unit :