Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1987-01-20
1989-01-03
Schwadron, Martin P.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251172, F16K 2500
Patent
active
047951320
ABSTRACT:
A sealing assembly (20) for a ball valve comprises two non compressible and relatively movable members, for example the ball (24) and seal housing (26) of a ball valve, having located therebetween a sealing element (32) which is inflatable by the introduction of hydraulic fluid.
The sealing element (32) is located in a recess in member (26) so that when the hydraulic pressure is released the element (32) retracts into the recess to release the sealing engagement and facilitate the relative movement of members (24, 26). A resilient rubber ring (40) is provided to bias the seal housing (26) away from the position of sealing engagement to also facilitate movement of members (24, 26). A second sealing element (25) is also provided. Both elements are carried by the seal housing (26) which is in the form of an annular piston movable by the hydraulic fluid.
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Fox John C.
Schwadron Martin P.
The British Petroleum Company p.l.c.
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