| 摘要 |
A coupling unit for piping is provided to prevent generation of a scale in a pipe by forming a smooth inner surface of the pipe, and to easy usability for installation and dismantlement of the pipe with inexpensive cost. A coupling unit for piping includes a fixing member(2), a fastening member(18) and a pressing ring(24). The fixing member is welded on an end part of a pipe. A vane part(4) includes a female screw formed to a longitudinal direction the pipe with an annular shape. The fastening member is inserted into an outer circumference of the pipe. A male screw(22) is formed to a pipe connection part. The pressing ring presses an outer circumference of the pipe according to change of width of the fixing member.
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