Fireless connecting piece of pipeline

The utility model discloses a fireless connecting piece of pipeline, including the main part, the main part be the echelonment structure, and its stepped section is provided with the external screw thread, and stepped section is last have been cup jointed one and rotate the nut, is provided with the internal thread with external screw thread intermeshing in the rotation nut, it supplies pipeline male aperture to be provided with respectively on main part and the rotation nut, be provided with seal assembly in the stepped section of main part, be provided with the cone in the rotation nut, and cone and the seal assembly effect of mutually supporting. The utility model discloses a conduit coupling has reduced the factor that receives the environmenttal stress, does not need specific tool operation, has eliminated the hidden danger that the conflagration produced, operates the influence of getting up can not receive operative employee people's craftsmanship skill level in addition, has reduced artifical procurement cost and has trained the cost. It connects the problem that dimensional requirement is too strict to the pipeline also to have solved pipeline sealing connection.