Control Valve Cv Sizing Calculator

Size control valves per ISA/IEC 60534 for liquid or gas service. Calculate required Cv, check for choked flow, and select nearest standard valve size.

Inputs

Service type (0=liquid, 1=gas)

Flow rate (GPM or SCFH)

Inlet pressure P₁ (psia)

Outlet pressure P₂ (psia)

Specific gravity

Temperature (°F)

Critical pressure drop ratio xT

Piping geometry factor Fp

Tab to move between fields

Results

Required Cv

22.36

Nearest standard Cv

Pressure drop ΔP (psi)20

Choked flow? (1=yes, 0=no)0

Rangeability (selected/required)1.34

Pressure drop ratio x (ΔP/P₁)0.2

Critical drop ratio xT0.7

FL0.84

How to Use This Calculator

Enter Service type (0=liquid, 1=gas), Flow rate (GPM or SCFH), and Inlet pressure P₁ (psia).
Set Outlet pressure P₂ (psia), Specific gravity, and Temperature (°F).
Adjust Critical pressure drop ratio xT, Piping geometry factor Fp as needed.
Review Required Cv and Nearest standard Cv.
Use Pressure drop ΔP (psi) and Choked flow? (1=yes, 0=no) to inform your decision.

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