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Automatic shut-off valve arrangement

  • US 5,813,432 A
  • Filed: 11/04/1994
  • Issued: 09/29/1998
  • Est. Priority Date: 11/05/1993
  • Status: Expired due to Fees
First Claim
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1. An automatic shut-off valve for use in fluid transfer operations, comprising:

  • a valve body having an inlet end and an outlet end;

    mounting means for mounting said valve body to an opening of a fluid container so that fluid entering the container must pass through said valve body;

    first valve means for permitting fluid to enter said inlet end of said valve body;

    main valve means, downstream of said first valve means within said valve body, for precluding fluid flow through said valve body when closed, said main valve means comprising;

    a piston;

    a volume chamber, expansion of which will extend said piston to close said main valve means;

    a metering tube for metering fluid from a location upstream of said main valve means to a location that is downstream of said main valve means;

    a bleed tube, positioned about said metering tube, defining in part a bleed passage, said metering tube and said bleed tube further defining a passage therebetween that is in communication with said volume chamber; and

    level sensor flow control means for restricting flow through said bleed passage, whereby back pressure will develop within said bleed tube, and fluid will build up in said bleed tube and be introduced into said volume chamber through said passage that is defined between said metering tube and said bleed tube, thereby closing said main valve means.

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