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Method and apparatus for preventing pump cavitation

  • US 3,981,618 A
  • Filed: 02/14/1975
  • Issued: 09/21/1976
  • Est. Priority Date: 02/14/1975
  • Status: Expired due to Term
First Claim
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1. A method of controlling a system having a pump driven by an engine, said pump having a discharge conduit with a variable flow rate controller to prevent cavitation due to engine overspeed comprising the steps of:

  • continuously sensing the speed of said engine and comparing the speed to a preselected set point speed;

    generating a command signal when said sensed speed exceeds said set point speed;

    actuating said flow controller with said command signal to change the flow rate of said discharge conduit by a predetermined decrement;

    subsequently blocking said command signal from activating said flow controller for a selected time interval to permit the flow rate to reach steady state, while reducing energy input to the engine to cause said engine speed to drop below said set point speed, whereby said engine speed is maintained substantially at said set point speed to prevent cavitation in the pump.

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