Control Valves
Actuator Sizing Margin
Actuator margin = (rated/required - 1) x 100%. Require >= 25%.
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Control Valves calculators
Control valve Cv calculators for liquid, gas, and steam screening. Enter flow, pressure drop, specific gravity, and valve opening to estimate Cv, required trim size, choked-flow margin, and noise-risk flags. Each tool shows the IEC 60534 flow equation with substituted numbers so you can audit the result against the datasheet, then links to the valve-sizing guides for cavitation and flashing checks.
Control Valves
Choked Flow & Cavitation Check
Allowable drop with choked-flow flag.
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Cv Kv Converter
Cv to Kv and Kv to Cv. Kv = 0.865 x Cv.
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Gas Valve Flow (Screening)
Gas valve screening with choked-flow flag at P2/P1 <= 0.5. Full sizing per IEC 60534.
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Liquid Cv Flow Calculator
Liquid Cv to flow at given dP and specific gravity. Kv = 0.865 x Cv.
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Required Cv from Flow
Required Cv from target flow, dP and SG, with 20% margin recommendation.
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Steam Tables (Screening)
Saturation pressure and enthalpies from temperature.
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Valve Opening Curve Estimator
Opening-to-flow ONLY with manufacturer curve data. Never assume 50% open = 50% flow.
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Valve Pressure Drop
Valve pressure drop from flow and Cv: dP = SG x (Q/Cv)^2.
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