February 2012

Fluid Flow

Eliminate cavitation in your piping systems

New pressure control devices improve fluid flow

Reducing pressure and controlling flowrates in pipes can be accomplished via restriction plate orifices or throttle valves. In all cases, it must be achieved without producing cavitation. To avoid cavitation with any pressure reducing component, Eq. 1 sets the process operating conditions: (P1 – Pv)/(P1 – P2) > Ci      (1) Where Ci is the incipient cavitation coefficient obtained by tests for every type of component. The ideal best component to run without cavitation would be with Ci = 1 and P2 = Pv. Control valves with an internal tortuous path almost approach this value. However, restriction orifice plates, along with globe and butterfly valves, h

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