| 摘要 |
A pipe flange is formed with an opening into which is fitted a pipe, and an annular groove which is coaxial with the opening and surrounds the same. A cylindrical is defined between the opening and the annular groove coaxially. A folding-back portion is led to the cylindrical portion and is adapted to retain one leading end of the pipe fitted into the opening. A pipe retaining portion is led to the folding-back portion and is folded back radially inwardly over the cylindrical portion in parallel therewith and is spaced apart therefrom by a predetermined distance. Therefore, the joining process can be simplified, and the work environment will not be contaminated. In addition, the joint strength and the air tightness can be enhanced. The pipe integral with the flange for pipe fitting is light in weight. Furthermore, the present invention is adapted for the mass production by the simple joining method.
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