F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
277/47, 251/49
F16K 5/20 (2006.01) F16K 3/20 (2006.01)
Patent
CA 1185585
ABSTRACT OF THE DISCLOSURE IMPROVEMENTS RELATING TO SEALS 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.
401636
British Petroleum Company P.l.c. The
Ridout & Maybee Llp
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