F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
285/41
F16L 27/00 (2006.01) F16J 15/48 (2006.01) F16L 39/06 (2006.01)
Patent
CA 1222785
SEAL CONSTRUCTION FOR FLUID SWIVEL JOINTS Abstract A fluid swivel joint, such as is commonly used on offshore loading terminals for tankers, includes first and second adjacent joint rings 36, 38 which are rotatable relative to each other about a common central longitudinal axis. The joint rings 36, 38 have a small annular, ring-shaped clearance gap 40 therebetween to allow relative rotational movement, and one of the rings 36 defines an annular seal housing groove 42 communicating with the clearance gap 40. Positioned in the seal housing groove 42 is an annular seal including an annular, flexible sealing member 44 and an adjacent anti-extrusion ring 46 to prevent the flexible sealing member 44 from being deformed into the clearance gap 40 by the relatively high fluid pressure differential existing across the seal. The anti-extrusion ring 46 or the sealing member 44 is biased mechanically by springs and/or by the pressure differential across the seal against an adjacent sealing surface on the other sealing ring 38 to provide an effective high pressure fluid seal between the rings 36, 38 and also to minimize the extrusion gap 40 existing within the seal.
443453
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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