| 摘要 |
Face and radial sealing arrangements for a fluid swivel joint such as is commonly used on offshore loading terminals for tankers. The sealed fluid joint includes first and second adjacent joint rings which are rotatable relative to each other about a common central longitudinal axis. The joint rings have a small annular, ring-shaped clearance gap therebetween to allow relative rotational movement, and one of the rings defines an annular seal housing groove adjacent to the clearance gap. An annular seal is positioned in the seal housing groove, and its components include an annular, sealing member and an adjacent antiextrusion ring to prevent the pliant sealing member from being deformed into the clearance gap by the relatively high fluid pressure differential existing across the seal. The present invention is particularly characterized by a construction in which the antiextrusion ring or the sealing member is biased, either mechanically by springs or by the pressure differential across the seal, against an adjacent sealing surface to provide an effective high pressure fluid seal therebetween and also to minimize the extrusion gap existing within the seal. Moreover, the components of the seal are relatively free floating to compensate for eccentricity or other variations or distortions in the components of the fluid swivel joint. |
