| 摘要 |
PROBLEM TO BE SOLVED: To easily and correctly perform alignment work of a piping when a fluid operation device is assembled by previously arranging an alignment mark for applying an index of rotational direction of a main body in relation to an axis extending through a stub, on a main body of a pipe joint, when the stub capable of welding is arranged on the main body of the pipe joint. SOLUTION: A pipe joint 10 of a 90 deg. elbow shape is provided with a pipe joint main body 12 welded with a stub 14 projected from a main body shoulder part 16 to an outside, the main body 12 and the stub 14 are formed of a plastic material of non-metal. Marks (alignment marks) 18 of one or more directions are formed on the pipe joint main body 12 in order to apply indexes of a relative rotational direction of a pipe joint in an axis through a welding stub 14. A plurality of alignment marks 18 are formed at constant clearances of, for example, 15 deg., 30 deg., 45 deg., 60 deg., 90 deg., and 180 deg., along the pipe joint main body 12 continuously to the shoulder part 16. It is thus possible to improve an alignment property of a piping when the fluid operation device is assembled.
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