Inflection Point Engineering Calculators

Control Valve Cv — Liquid (ISA 75.01)

Required valve flow coefficient Cv for incompressible liquid service per ISA 75.01 / IEC 60534-2-1. Includes choked-flow check, cavitation and flashing screens.

Standard: ISA 75.01.01 / IEC 60534-2-1 — incompressible liquid flow. Base equation: Cv = Q √(SG / ΔP) / Fp. Typical FL: globe 0.9, ball 0.6, butterfly 0.7. Target 50–80% opening at normal flow; typical globe rangeability 50:1.