Control Valve Sizing for Liquid Service
Calculate the required flow coefficient (Cv) for a control valve handling incompressible liquids and check if a candidate valve’s rated Cv is adequate while maintaining controllability within 30–80 % of rated travel.
📖 Need the theory? Read the methodology, assumptions, and equations in the full reference guide.
1. Define Input Parameters
2. Engineering Output
Pressure drop (dP)
- psi
- psi
Required Cv (Cv_req)
- gpm/√psi
- gpm/√psi
Design Cv with safety factor (Cv_design)
- gpm/√psi
- gpm/√psi
Fraction of rated travel (Travel)
- -
- -
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Download Offline Excel CalculationContext & Assumptions
This first-pass sizing method is embedded in every process simulation and P&ID review to ensure the selected valve can pass the maximum required flow without cavitation or excessive throttling. It uses the ISA liquid equation and a safety factor to pick the smallest standard valve that keeps operation in the linear control region.
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