The only reason that "back pressure" would reduce cavitation is by reducing
the flow rate so that the water on the supply or suction side of the pump can
catch up to the flow. When the pressure on the supply or suction side is
reduced by flow to the point where it is lower than the vapor pressure of the
fluid pumped, then you get cavitation. Rather than reduce the flow with some
sort of restricter on the pressure side of the pump, I would work on
improving flow into the pump- reduce friction loss and increase volume into
the pump as much as possible.
Just my .02 dollar's worth.
Brian Trubee
Redmond, Wa

 
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