| 摘要 |
A tube compression coupling comprising a coupling body 1, a first ferrule 8, a second ferrule 15, an O-ring 19 and a retaining member 13. The inner ferrule 8 is a compressible ferrule which forms a seal with the tube 3 whilst the outer ferrule 15 forms seals with the inner ferrule 8 and with the coupling body 1 by means of a 60 DEG cone 18 and corresponding seat 7 in the coupling body 1. The two ferrules 8, 15, together with the tube 3 and coupling body 1 form an annular space wherein the O- ring 19 is retained in sealing contact with the tube 3 and the coupling body 1 by the ferrules 8, 15 without the O-ring 19 being damaged on the tightening of the compression coupling by tightening retaining member 13 which is in threaded engagement with coupling body 1. This enables an O-ring 19 to be used in a compression coupling in such a way that it only experiences a pre-determined amount of deformation to provide a seal. <IMAGE> |
