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Pump protection system

  • US 4,620,835 A
  • Filed: 06/01/1984
  • Issued: 11/04/1986
  • Est. Priority Date: 06/02/1983
  • Status: Expired due to Term
First Claim
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1. A protection system for a liquid pump, comprising a protection switch connected to a sensor for sensing a flow characteristic of liquid flow through the pump and for producing a signal indicative of the existence of that characteristic, means for rendering the pump operative or inoperative in dependence upon the presence or absence of a signal from the sensor, a manual override means for rendering the pump operative in the absence of a signal from the sensor and an override switch to switch off said pump, said override switch being connected to two signal-responsive switches, one for overriding the protection system and the other a latching switch establishing a control line in series with said protection switch.

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