Control Valve Sizing - CTi Controltech

← Back to document page

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.

at or below vapor pressure. The result is a two phase mixture (vapor and liquid) at the valve outlet and in the downstream piping. Velocity of this two phase flow is usually very high and results in the possibility for erosion of the valve and piping components. Choked Flow Choked flow occurs in gases and vapors when the fluid

  Vapor, Results