| 摘要 |
A push fit coupling for non-metallic gas pipes comprises a hollow metal body 1, an end of which is arranged to receive a non-metallic gas pipe 50. The body comprises a crushable ring 24 within the body having a frustro-conical outer surface (30, fig 4), and a non-metallic sleeve 32 having a frustro-conical inner surface 40, and means to prevent withdrawal of the sleeve from the body. The sleeve and ring act together so that any force acting to separate the pipe from the coupling causes the inner surface of the sleeve to act on the outer surface of the ring, so as to force the ring to engage the outer surface of the gas pipe more tightly. A protective collar or sheath 60 may surround the gas pipe. |
