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Cavitation guide CAVITATION GUIDE The dark shaded portion of the chart illustrates the region where cavitation damage may occur The lighter shaded portion is where signi ?cant cavitation noise and vibration may occur Operating conditions inside the dark s

CAVITATION GUIDE The dark shaded portion of the chart illustrates the region where cavitation damage may occur The lighter shaded portion is where signi ?cant cavitation noise and vibration may occur Operating conditions inside the dark shaded area is permissible for infrequent periods of short duration The guide is for modulating service valves For on o ? valves consult factory The chart is based on cavitation index sigma values as de ?ned by Utah State University Water Research Laboratory P ?? Pv where P ?? P cavitation index P inlet pressure psi P outlet pressure psi Pv water vapor pressure psig The dark shaded portion is below of and the lighter shaded area is below of The chart is to be used for typical valve operating conditions below open at standard water temperature and elevation below feet More accurate cavitation conditions are determined from the Cla-CAV analysis program including static and dynamic inlet and outlet pressures ow range elevation water temperature and service conditions If operation is inside the shaded areas the Cla-CAV analysis can be used to determine whether added backpressure from an ori ?ce plate a second valve in series or adding KO Anti-Cavitation trim see - KO data sheet is necessary Inlet Pressure psi Cavitation Zones - - Cavitation Damage Zone Cavitation Noise Zone This chart should be used as a general guide for determining safe operating pressure drop conditions for Cla-Val modulating service control valves Outlet Pressure psi For a more detailed cavitation analysis or if operation will be outside of the above chart request a Cla-CAV computer analysis Cla-CAV can evaluate what options best solve any potential cavitation problem In the example shown a inch - modulating service valve requires an ori ?ce plate downstream to prevent damaging cavitation For wider ow range service either an extra valve in series or the addition of KO Anti-Cavitation trim to the valve may be necessary see - KO data sheet Consult factory for a free analysis for wide open or modulating service valves Cavitiation Characteristics Flow gpm Valve Ori ?ce If the lines go above there will be cavitiation damage CLA-VAL P O Box ? Newport Beach CA - ? Phone - - ? Fax - - ? E-mail claval cla-val com ? Website cla-val com ? Copyright Cla-Val Printed in USA Speci ?cations subject to change without notice E-Cavitation Guide R- C