Calculate the Valve Flow Coefficient (Cv) required for a specific flow rate and pressure drop.
Flow Parameters
Calculation Results
About this calculator
Overview
The Valve Flow Coefficient (Cv) is a standard measure of a valve's capacity. It represents the number of US gallons of water at 60°F that can flow through a valve per minute with a pressure drop of 1 psi.
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Cv = Q * sqrt(SG / ΔP)
Q is Flow Rate in GPM (Gallons Per Minute)
SG is Specific Gravity of the fluid (Water = 1)
ΔP is Pressure Drop in PSI
Ensure ΔP is not zero to avoid division by zero.
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Fun Facts
"The Cv value is widely used in the US, while Kv is the metric equivalent used in Europe (Kv ≈ 0.865 * Cv)."
"Specific gravity is the ratio of the fluid's density to the density of water."
"Oversizing a valve can lead to poor control performance, while undersizing creates excessive pressure drop."
