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On-demand zone valve recirculation system

  • US 5,829,475 A
  • Filed: 03/03/1997
  • Issued: 11/03/1998
  • Est. Priority Date: 03/03/1997
  • Status: Expired due to Term
First Claim
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1. A hot water recirculation system comprising:

  • a hot water source;

    conduit means, in fluid communication with the hot water source and at least one plumbing fixture having a hot water valve, for enabling circulation of hot water from said hot water source to the plumbing fixture and return to said hot water source;

    pump means for circulating hot water through the conduit means;

    zone valve means, disposed on the conduit means, for preventing a flow of water through the conduit means from said hot water source to the plumbing fixture, and for preventing a flow of water from the plumbing fixture to the hot water source;

    switch means for generating a control signal; and

    control means for causing the zone valve means to open and allow water flow there through in response to the control signal.

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