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 uses a systematic method for selecting body types, sizes, materials, pressure ratings and trim sizes based on flow characteristics. 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 ...

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