Control Valve Sizing - CTi Controltech

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3-1Rev. 6/94CONTENTSIntroduction ........................................ ............ 3-1Nomenclature ........................................ ......... 3-1Calculating Cv for Liquids ............................... 3-3Liquid Sizing Examples .................................. 3-7Calculating Cv for Gases. ............................. 3-10Gas Sizing Examples ................................... 3-13Calculating Cv for Two Phase Flow ..............3-15Vapor Pressure Charts ................................ 3A-1Steam Tables ........................................ .......3A-7Fluid Property Correlation Constants ...... ...3A-21Pipe Data ........................................ ........... 3A-29INTRODUCTIONValtek 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 .

Valtek control valve flow capacity (C v) is based upon the industry standard, ANSI/ISA S75.01. This standard and the corresponding measuring standards contain Equations used to predict the flow of compressible and incompressible fluids in control valves. Slightly differ-ent forms of the basic Equation are used for liquids and gases.

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