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Automatic fluid flow sensor and fluid shut-off system

  • US 5,004,014 A
  • Filed: 06/29/1990
  • Issued: 04/02/1991
  • Est. Priority Date: 06/29/1990
  • Status: Expired due to Fees
First Claim
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1. An automatic fluid-flow sensor and fluid shut-off system that functions in combination with a water supply source applied through a main water pipe connected in-line with a main water valve and pressure regulator, said system comprising:

  • (a) an electrical valve connected in line with said main water valve,(b) a flow-sensing valve connected in-line with said electrical valve, where said flow sensing valve includes an optical path and means including a movable element that remains below the optical path when there is no fluid flow through said flow-sensing valve which causes a no-flow signal to be produced and that interrupts the optical path when there is a fluid flow which causes a flow trigger signal to be produced, and(c) an electronics control unit having the means to;

    (1) control the application of an a-c voltage that turns on said electrical valve,(2) receive and process the no-flow or flow trigger signals from said flow sensing valve,(3) start a programmable timer circuit that is directly coupled to receive the no-flow and flow trigger signals from said flow-sensing valve such that when the flow trigger signal is received, upon the lapsing of a preset time, a signal, that is free of microprocessor control, is produced that removes the a-c power being applied to said electrical valve which causes said valve to close and stop the fluid flow.

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