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Valve Cv / Kv Sizing

The flow coefficient Cv is the flow of water (US gpm) a valve passes at 1 psi pressure drop. For liquids, Cv = Q·√(SG/ΔP) — size the valve for Cv, or find the flow or ΔP a known valve gives. Kv (m³/h at 1 bar) = 0.865·Cv.

Solve for

Specific gravity SG

Flow Q (US gpm)

Pressure drop ΔP (psi)

Required Cv

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Kv equivalent

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Turbulent liquid, non-choked, non-flashing service. For gas/steam or choked flow use the full ISA/IEC 60534 method. A helper, not a substitute for engineering judgment.