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 . Slightly differ-ent forms of the basic Equation are used for liquids steps for Sizing and selecting the correct valveinclude calculating the required Cv.

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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  Control, Valves, Control valves, Valtek, Valtek control

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