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Liquid filled pressure/vacuum valve for petroleum underground storage tanks

  • US 20080173371A1
  • Filed: 07/27/2007
  • Published: 07/24/2008
  • Est. Priority Date: 08/01/2006
  • Status: Active Grant
First Claim
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1. A liquid filled pressure/vacuum valve for underground storage tanks comprising:

  • a body having an inlet coupled to the underground storage tank and an outlet coupled to atmosphere;

    a suction zone disposed in said body and fluidly coupled to said inlet;

    a pressure zone disposed in said body and fluidly coupled to said outlet, said pressure zone in fluid communication with said suction zone;

    a separator disposed in fluid communication with said outlet and said pressure zone; and

    a fluid disposed in said body and configured to flow between said suction zone and said pressure zone, said flow of said fluid is determined by an increased force due to a pressure differential between said suction zone and said pressure zone.

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