Transcription of FLUID FLOW BASICS OF THROTTLING VALVES
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FLUID FLOW BASICS OF THROTTLING VALVES
FLUID FLOWFLUID FLOWBASICSBASICSOFOFTHROTTLING VALVESTHROTTLING hrottlingValveUpstreamDownstreamFLUID FLOW BASICS OF THROTTLING VALVESFLUID PARAMETERS FLUID PARAMETERS The following FLUID parameters are frequently associated with THROTTLING VALVES PSize = P1 - P2 T = T1 - T2 PressuresFlowQuantityThermo-dynamicRelat iveWeight/MassGeometricFluid Resistanceto Flow CONDITION 1 CONDITION 2m1_____Mass Flow Rate _____ m2Q1, 1_____Volumetric Flow Rate _____ Q2, 2P1, PS1, P1(Abs)_____Static Pressure _____ P2, PS2, P2 (Abs)PV1_____Velocity Pressure _____ PV2 PVC Pressure @ Vena Contracta Psize Sizing Pressure DropVapor PressurePVP1, PSAT1 PVP2, PSAT2 Saturation PressureT1, 1(Abs), T1@xx SH_____Temperature _____ T2, 2(Abs), T 2@xx SHTSAT1_____Saturation Temperature _____ TSAT2H1, h1_____Enthalpy _____ H2, h2 1_____Specific Volume _____ 2 1_____Liquid Density _____ 2 1_____Actual Gas Density_____ 2SG1_____Specific Gravity _____ SG2 1P_____Pipe Diameter _____ 2P 1V_____Valve Body Size _____ 2VZ1_____Elevation Head _____ Z2A1_____Cross-Section Area _____ A2v1V_____Avg.
Valves that are utilized as fluid control devices are typically “throttling valves”. Such valves experience internal velocity and internal pressure gradients (both positive and negative) that conclude with a permanent pressure loss (∆P) from the inlet pipe-to-outlet pipe
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