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Cavitation guide The dark shaded portion of the chart illustrates the region where cavitation damage may occur The lighter shaded portion is where significant cavitation noise and vibration may occur Operating conditions inside the dark shaded area is per

The dark shaded portion of the chart illustrates the region where cavitation damage may occur The lighter shaded portion is where significant 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 off valves consult factory The chart is based on cavitation index sigma values as defined by Utah State University Water Research Laboratory where cavitation index P inlet pressure psi P outlet pressure psi P v 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 flow 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 orifice plate a second valve in series or adding KOAnti-Cavitation trim see - KO data sheet is necessary P ?? Pv P ?? P E-Cavitation Guide R- CLA-VAL Copyright Cla-Val Printed in USA Specifications subject to change without notice P O Box ? Newport Beach CA - ? Phone - - ? Fax - - ? E-mail claval cla-val com ? Website cla-val com ? For a more detailed cavitation analysis or if operation will be outside of the above chart request a Cla-CAVcomputer analysis Cla-CAV can evaluate what options best solve any potential cavitation problem In the example shown a inch - modulating service valve requires an orifice plate downstream to prevent damaging cavitation For wider flow 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 Valve Orifice If the lines go above there will be cavitiation damage Cavitiation Characteristics Flow gpm Outlet Pressure psi 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 CAVITATION GUIDE