Control element and check valve assembly
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United States of America Patent
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Nov 17, 2015
Grant Date -
Jun 4, 2015
app pub date -
Dec 4, 2013
filing date -
Dec 4, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An arrangement includes a housing defining a first and second ports. A first passageway provides communication between the ports; a second passageway provides communication with the first port. An element is disposed in the housing and positioned by a balance of forces, the element is positionable to throttled positions for controlling flow through the first passageway in a first direction and to an open position to permit unrestricted flow in a second direction. A check valve is disposed in the second passageway for preventing flow therein from the first port when pressure in the first port is greater than pressure in the second port, and permitting flow through the second passageway to the first port when pressure in the first port is less than the pressure in the second port thereby affecting the balance of forces acting on the element so the element is urged toward the fully open position.
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