| 摘要 |
PCT No. PCT/GB94/00719 Sec. 371 Date Nov. 21, 1995 Sec. 102(e) Date Nov. 21, 1995 PCT Filed Apr. 5, 1994 PCT Pub. No. WO94/23233 PCT Pub. Date Oct. 13, 1994A pipe coupling for coupling together two lengths of pipe comprising first and second collars or flanges secured to the ends of the lengths of pipe and having joining surfaces thereon which abut one another on securing the lengths of pipe together,radially aligned grooves are formed in the joining surfaces for receiving a seal which includes a rigid first seal component and a flexible second seal component bonded to the first seal component,the seal extending partially into both grooves to seal between the joining surfaces of the collars.
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