| 摘要 |
Weldable Pipe Fittings and Pipe Joints Formed Therewith A weldable pipe fitting includes a sleeve member of thermoplastic material, the sleeve member having a stress resistant portion of greater wall thickness, a terminal portion of greater wall thickness, and a fusion accommodating portion of lesser wall thickness between the stress resistant portion and the terminal portion, wherein the stress resistant portion is arranged in use to overlie the end of the pipe to be connected to the pipe fitting; the stress resistant portion of the sleeve has a standard dimensional ratio within the range of no less than 8:1 and no more than 12:1, the terminal portion of the sleeve has a standard dimensional ratio within the range of of no less than 8:1 and no more than 12:1, and the fusion accommodating portion has a standard dimensional ratio within the range of no less than 14:1 and no more than 19:1; and the internal wall of the sleeve is provided with an electric heating wire or wires along and within the wall and disposed circumferentially thereof adjacent the radially inner surface of the wall, said heating wire or wires being disposed over a length of the sleeve at least the majority of which is within the fusion accommodating portion thereof.
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