# Cv Calculation For Butterfly Valve ### In the results area the output of the valve sizing is summarized into three sections (figure 1.13):

Cv calculation for butterfly valve. You can do a quick check by seeing what the dp will be for your wide open flow using the equation q = cv (dp/sg)^2 i posted earlier. Although both valves have the same flow capacity (cv), the graph of flow through the butterfly valve (red line on the left hand graph) looks quite different than the graph of flow through the globe valve. 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 graph shows the cv or kv valve fraction vs opening and closing angle of a butterfly valve: Be careful, it should be expressed in inches. Triad offers a quick c v calculator that allows users to determine the proper size of the valve by merely entering the desired flow and flow conditions for each valve application.

Butterfly valves are less expensive. Chapter 1 offers an introduction to control valves,. Calculation of cv/d 2 [valve world] the calculation of cv/d 2 is required for the next steps of the valve sizing.

Imperial measure flow in us gallons per minute of water at 60° fahrenheit with pressure drop of 1 psi across the valve. The formula below allows for calculation of flow rate and pressure drop through a valve with a specified cv value. The larger this value, the higher the flow rate through the valve will be at a given pressure drop.

The valve flow coefficient, cv, is the number of u.s. Equations displayed for easy reference. When sizing a control valve, the most common approach is to calculate the flow coefficient, cv which is a measure of the capacity of the valve body and trim.

To find necessary cv for a 55 scfm flow: 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.

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