Calculate flow rate, Cv, or pressure drop for liquid valves.
Input Parameters
Calculation Results
Enter parameters to calculate
Quick Reference
QFlow Rate (gpm)
CvFlow Coefficient
ΔPPressure Drop (psi)
SGSpecific Gravity
Overview
The flow coefficient (Cv) is a relative measure of a valve's efficiency at allowing fluid flow. It is defined as the volume of water in US gallons per minute that will flow through a valve with a pressure drop of 1 psi.
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Pro Tips
Specific Gravity (SG) for water is 1.0.
Flow rate (Q) is in US Gallons per Minute (GPM).
Pressure drop (ΔP) is in Pounds per Square Inch (PSI).
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Fun Facts
"Cv is primarily used in North America; the metric equivalent is Kv."
"Kv = 0.865 * Cv."
"A valve with a higher Cv can pass more flow with the same pressure drop."
