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Valve Sizing [Industrial Guide Line]
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Control Valve Sizing Procedure1. IntroductionThe control valve is a flow controlling device. The orifice plate [just to name one] is a flow measuring device. They both operate on the Torricelli principle.The orifice plate is sized to produce ΔP in relation to the flow of fluid to be measured. The orifice sizing is iterated on itself and converges rapidly. Unlike the orifice plate which is a fixed geometry, the control valve is a variable geometry and sizing does not iterate on itself, it iterates on catalog pages of the designer trying to select the best compromise for the flow range of the process and the service conditions. The material in this work sheet is largely based on Fisher Controls and the ISA Handbook of Valve Sizing. More useful stuff is added for augmenting the comprehension and best design of a project. The procedure is automated in the sense that it is based on functions rather than nomographs. ====================As it says: Guide Line for liquids/gases of "visible" flow/properties. For microvalves [droplets] and viscous fluids: please consult manufacturers/suppliers. Jean Inst_Valve Sizing Copy.sm (540kb) downloaded 73 time(s).
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Valve Sizing [Industrial Guide Line]
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