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Automatic shut-off valve

  • US 4,457,452 A
  • Filed: 05/24/1982
  • Issued: 07/03/1984
  • Est. Priority Date: 05/24/1982
  • Status: Expired due to Term
First Claim
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1. An automatic shut-off valve comprising in combination:

  • a valve body having an upper end and a lower end, first and second inlet means in the lower end of said valve body for receiving hot and cold water supplied to said valve, said valve body having at least one outlet through which discharged water flows;

    a piston cylinder within said valve body, said cylinder having upper and lower ends;

    a piston slidably disposed within said cylinder and having a larger effective area at its bottom end than its top end;

    a spring arranged so as to urge said piston upward;

    a first passageway for leading hot and cold water from said inlet means to a first volume of said cylinder above said piston;

    a second passageway for leading hot and cold water from said inlet means to a second volume of said cylinder below said piston, said second passageway being arranged so that the rate of water flow into said second volume is a fraction of the rate of water flow via said first passageway into said first volume;

    a third passageway for passing water from said second volume to said first volume around said piston;

    means on said piston for substantially preventing flow of water from said second volume to said first volume via said third passageway when said piston is moving up in said cylinder;

    a valve opening for passing mixed water from said first volume to said at least one outlet;

    a valve seat in the upper end of said piston cylinder surrounding said valve opening;

    a valve closure member attached to the upper portion of said piston in position to engage said valve seat when said piston moves upwardly in said piston cylinder;

    a stem slidably attached to said valve body and arranged to engage and push said valve closure member down so as to open said valve opening;

    a valve operating handle attached to said stem to facilitate pushing said stem downward so as to open said valve opening; and

    adjustable valve means between said first and second inlet means and said cylinder for varying the proportion of hot and cold water delivered from said first and second inlet means to said first volume via said first passageway, whereby to control the temperature of mixed water discharged via said at least one outlet.

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