Apparatus and Methods for Limiting or Preventing Backflow of Gas up Through a Plumbing Fixture
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United States of America Patent
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app pub date -
Aug 22, 2013
filing date -
Aug 27, 2012
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Abandoned
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Abstract
Apparatus useful for allowing the flow of liquid down through a pluming fixture to a destination below it and limiting or preventing the backflow of gas from the destination up into the pluming fixture includes a frame and a disc pivotably connected thereto. The disc is biased in a closed position and pivotably moveable into an open position upon the application of sufficient forces acting on the upper surface thereof caused by fluid from the plumbing fixture.
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