Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1976-05-07
1978-01-31
Nilson, Robert G.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251315, F16K 520
Patent
active
040712206
ABSTRACT:
A ball valve is provided including coupled outer casing elements adapted to enclose a rotationally movable valve body having an axial flow passageway therethrough. An annular casing groove having an anular seal member mounted therein is located adjacent each of the opposite ends of the flow passageway for sealingly engaging the movable valve body. Each of the annular casing grooves includes an annular casing wall projecting toward the movable valve body, and each of the seal members includes a flexible leg extending between its associated casing wall and movable valve body. A first surface of each flexible leg engages the movable valve body and a second, opposed surface of each leg is spaced a predetermined distance from its associated casing wall to accommodate a flexion of the flexible leg. Each of the seal members has a secondary sealing surface extending from the first surfaces thereof, and the secondary surfaces are spaced from the movable body a distance less than the foregoing predetermined distance. A spirally wound resilient member is carried in a recess in each of the seal members to bias the flexible legs into sealing engagement with the movable valve body and to urge the seal members into their associated annular casing grooves. Each of the annular casing walls also provides a further sealing surface adapted to engage the movable valve body upon failure of the seal members and axial displacement of the movable valve body toward the annular casing wall.
REFERENCES:
patent: 3181834 (1965-05-01), Jennings
patent: 3387815 (1968-06-01), Richards
patent: 3656711 (1972-04-01), Toelke
patent: 3760833 (1973-09-01), Kemp
Kitazawa Shoji Kabushiki Kaisha
Nilson Robert G.
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