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Electromechanical device for the protection of a pump in waterworks of various types, in the absence of water

  • US 5,672,049 A
  • Filed: 04/26/1994
  • Issued: 09/30/1997
  • Est. Priority Date: 04/28/1993
  • Status: Expired due to Fees
First Claim
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1. A pump protection device comprising:

  • a housing defining first and second chambers, said first chamber being in communication with a flow of a pump;

    a diaphragm positioned across said first chamber;

    a movable element having a first portion in contact with said diaphragm, said movable element having a second portion extending from said first chamber into said second chamber;

    a spring means for biasing said movable element against said diaphragm;

    electrical circuit means positioned in said second chamber and for interacting with said second portion of said movable element to determine when a pressure of the flow is an insufficient pressure for the pump to operate, said electrical circuit means blocking operation of the pump when said pressure is insufficient;

    an annular seal positioned around said second portion of said movable element to form a seal between said first chamber and said second chamber.

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