| 摘要 |
{PG,1 The preferred embodiment of the invention disclosed herein includes a first sleeve member having a slightly enlarged diameter portion at one end thereof and a second sleeve member having one end telescopically received within the enlarged diameter portion such that said first and second sleeve members are movable between expanded and contracted positions. Also included is a third sleeve member fixed to the outer surface of the second sleeve member and extending axially about the enlarged diameter portion and a portion of the smaller diameter portion of the first sleeve member. The third sleeve member is radially spaced from the first sleeve member forming a pressure chamber which communicates with the interior of said sleeve members through ports formed in the enlarged diameter portion. Thus, fluid pressure acts in the pressure chamber to counteract separation forces in an associated pipeline. First packing means is carried on the end of the third sleeve member adjacent the first sleeve member and is in sealing engagement therewith; second packing means is carried on the free end of the enlarged diameter portion between the second and third sleeve members and is in sealing engagement therewith. The second packing means includes a gland and an elongated filler tube extending from the gland between the second and third sleeve members and terminates beyond the third sleeve member whereby it is accessible and the second packing means can be repacked without dismantling the joint assembly or interrupting the flow of fluid in the associated pipeline.
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