Quote:
Originally Posted by CliftonArbogast
75% open will not hurt pump, you can get cavitation with going too low of a flow. Wont save money as pump has to make more pressure to get through restriction. If you need to cut back more than half i would downsize pump.
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You do not get cavitation from restricting the output of a pump, but from either not having enough flow through the pump(on the suction side,) or restricting the suction too much with a valve.