| 摘要 |
The invention firstly involves a pipe connector having an outer coupling formation and a longitudinal bore from a first end to a second end. The bore is adapted to engage over the end of a pipe at the second end and has a reduced diameter at the first end provided by an inward step. A first sealing formation is provided at the first end to establish a seal axially inwardly from the diameter of the bore at the second end. A second sealing formation in the bore establishes a seal about the end of a pipe axially outwardly from the first seal. The sealing formations are annular grooves for elastomeric seals. The coupling formation is preferably a tapered flange for a clamp, which will secure two connectors together forming a coupling. Through the configuration of the connectors and arrangement of the sealing formations, a coupling which is pressure assisted is provided. A further feature is that the bore of each connector is screw-threaded adjacent the second end. This enables engagement of corresponding screw-threads on the end of a metal sleeve on a plastics pipe. The pipe will be made from Unplasticized Polyvinyl Chloride (UPVC) and the sleeve, of steel. The pipe may have an inner lining selected from Polytetrafluroethylene (PTFE), Ultra High Molecular Weight Polyethylene (UHMW-PE), High Molecular Weight Polyethylene (HMW-PE), High Density Polyethylene (HDPE) and Polypropylene. Such a lining is particularly suited for conveying backfill. In addition to the coupling, a pipe is thus also provided and together these components form a pipe connecting system. |
