Miniature pump device with an anti-free flow valve
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United States of America Patent
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Apr 15, 2014
Grant Date -
Jun 3, 2010
app pub date -
Oct 22, 2009
filing date -
Oct 22, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A miniature unidirectional valve configured to restrict the free flow of fluid through the valve includes a valve body having an inlet and an outlet. A flexible membrane is movably disposed over the inlet and outlet, and movable between an open position and a closed position. The flexible membrane is movable by a pressure from the inlet to move the membrane to the open position. A control chamber is disposed in the valve body adjacent the fluid flow path, and configured to apply a pressure against the membrane to move the membrane to the closed position to restrict fluid flow through the valve. A preload structure is associated with the flexible membrane, and biases the flexible membrane toward the closed position.
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