Plug valve with an internal check valve
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United States of America Patent
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Feb 24, 2015
Grant Date -
Mar 29, 2012
app pub date -
Sep 19, 2011
filing date -
Sep 29, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A valve device is provided for controlling air flow. The valve device includes a plug closure member having an interior chamber and a stop device positioned within the interior chamber of the plug closure member. The valve device further includes a check valve having a plate positioned adjacent an inlet opening of the plug closure member and an alignment device attached to the plate and received within a stop opening of the stop device. The check valve is movable between a closed position in which the plate limits passage of a lift air through the interior chamber and an open position in which the plate allows passage of the lift air through the interior chamber. The stop device engages the check valve in the open position.
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