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Control Valve Sizing - CTi Controltech

3-1 Rev. 6/94 CONTENTSI ntroduction .. 3-1 Nomenclature .. 3-1 Calculating Cv for Liquids .. 3-3 Liquid Sizing Examples .. 3-7 Calculating Cv for Gases.. 3-10 Gas Sizing Examples .. 3-13 Calculating Cv for Two Phase Flow ..3-15 Vapor Pressure Charts .. 3A-1 Steam Tables ..3A-7 Fluid Property Correlation Constants ..3A-21 Pipe Data .. 3A-29 INTRODUCTIONV altek uses a systematic method for selecting bodytypes, sizes, materials, pressure ratings and trim sizesbased on flow Control Valve flow capacity (Cv) is based upon theindustry standard, ANSI/ISA This standardand the corresponding measuring standards containEquations used to predict the flow of compressible andincompressible fluids in Control valves.

When selecting a control valve for an application, the calculated C v is used to determine the valve size and the trim size that will allow the valve to pass the desired flow rate and provide stable control of the process fluid. Pressure Profile Fluid flowing through a control valve obeys the basic laws of conservation of mass and energy, and the

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