Valves and valve actuation – Mechanical movement actuator – Particularly packed or sealed
Patent
1988-05-19
1990-01-16
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Particularly packed or sealed
251148, 251315, 277112, 277121, 277125, 277188A, 277190, 277206A, 277209, F16K 4104, F16J 1520
Patent
active
048937819
ABSTRACT:
A new packing arrangement is provided for improved sealing and limiting potential for extrusion of one packing member relative to another. The stem packing arrangement is disclosed with particular reference to a ball valve assembly having a body housing a selectively rotatable valve member. An actuating stem extends from the body through a stem passage and the packing assembly is received in the passage around a portion of the stem. First, second, third, and fourth members progressively increase in hardness to limit extrusion of one member relative to another. A predetermined compression is also applied to the packing assembly and is independent of the actuating stem so that bearing member life is increased. The second member includes a tapered external surface that cooperates with the stem passage to provide a wedging action along the inner and outer diameter portions thereof. Additionally, the third and fourth members have cooperating slippage surfaces that urge the third member toward sealing engagement with the actuating stem.
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Kalain Terry M.
Williams Peter C.
Yusko Jr. Edward M.
Walton George L.
Whitey Co.
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