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Control Valve Sizing Calculator

Valve Cv Coefficient

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Control Valve Sizing Calculator
Sizes control valves for gas and liquid service using ISA-75.01 (IEC 60534) Cv methodology. Handles critical and subcritical flow with proper choked flow corrections for natural gas applications.

Service Type

GPM
-

Pressure

psig
psig

Valve Type

in

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Understand control valve sizing principles, calculations, and industry applications

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Sizing Equations

Liquid: Cv = Q × √(G / ΔP)
Gas: Cv = Q × √(G × T) / (963 × P₁ × √ΔP)
Q = Flow rate (GPM or SCFH)
G = Specific gravity
ΔP = Pressure drop (psi)

Standards & References

  • ISA-75.01
    Flow Equations for Sizing Control Valves
  • IEC 60534
    Industrial-process Control Valves
  • ANSI/FCI 70-2
    Control Valve Seat Leakage

Important Notes

  • Cv = flow rate (GPM) at 1 psi drop for water at 60°F
  • Select valve with Cv 20-30% higher than calculated
  • Check for choked flow conditions in gas service
  • Cavitation risk when ΔP > 0.5 × P1 for liquids
  • Kv (metric) = Cv × 0.865
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