Drain valve and method for operating a drain valve
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United States of America Patent
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Dec 2, 2014
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app pub date -
Sep 16, 2011
filing date -
Sep 16, 2011
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Abstract
A drain valve includes an inlet plenum, a first orifice downstream from the inlet plenum, a second orifice downstream from the first orifice, and a fluid passage between the first and second orifices. A piston having a first position and a second position has a first surface area exposed to the fluid passage when the piston is in the first and second positions and a second surface area exposed to the inlet plenum when the piston is in the second position.
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