Pipe joint nuts, pipe joints, fluid pressure equipment and fluid control systems, and nut rotation jigs and pipe joint nut screwing methods

摘要

PROBLEM TO BE SOLVED: To facilitate tightening of a nut for a pipe joint even in a narrow space. SOLUTION: A pipe joint nut (40, 42) made of a resin material is connected to a hollow large-diameter cylinder portion 170 in which a female screw portion 178 is engraved on an inner peripheral wall, and the large-diameter cylinder portion 170. It has a small-diameter tubular portion 172 that is hollow and has a cylindrical shape having a smaller diameter than the large-diameter tubular portion 170. On the outer peripheral wall of the small-diameter tubular portion 172, a plurality of engaging grooves 186 that are recessed inward in the radial direction of the small-diameter tubular portion 172 and extend along the longitudinal direction orthogonal to the radial direction are formed. Orthogonal. [Selection diagram] Fig. 2