Butterfly valve and system employing same and method for using same field
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United States of America Patent
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Jul 1, 2014
Grant Date -
May 5, 2011
app pub date -
Nov 3, 2009
filing date -
Nov 3, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A butterfly valve comprises: a body including a valve opening; and a flapper rotatably mounted about a rotation axis so as to be movable relative to the valve opening. The flapper is rotatable at least 180° about the rotation axis so that the flapper is movable to at least one fully opened position, at least one fully closed position 90° apart from the fully opened position, and a third position, either fully opened or fully closed, 180° from the other like position. In one embodiment the flapper is rotatable at least 360° about the rotation axis so that the flapper is movable to each of two opened positions 180° apart, and two closed positions 180° apart from each other and 90° and 270° apart from each of the fully opened positions. The valve can be easily calibrated and controlled, and cleaned to extend the useful service life between cleanings.
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Cited Art Landscape
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