Control Valve Flow Coefficient Cv Basic Concept

"What is Cv in Control Valve? Cv is Flow Co-efficient or Capacity Index for the control valves. Cv is the important component in Control Valve sizing and every technician should understand its meaning. The Cv can be roughly assumed as the Valve seat orifice area and the valve plug opening although this assumption is inaccurate but it helps us to understand the abstract term easily.

The higher Cv will give higher volumetric flowrate compared to low Cv value. Note that Cv value will vary depending on the opening percentage of control valve. The higher the valve opening, the higher the Cv value."

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