It is the joint part of the threaded connection pipe. Threaded connection pipes advance section by section from the beginning, because the threads are all in the same direction. The'live joint' can connect the left and right pipes in the middle, because the'live joint' consists of three pieces, the left and right pieces are internal and external threads at each end, and the middle piece is internal thread plus internal flanging, which is one The kit contains a certain clearance space. The flanging part is locked in size with the left part and can rotate freely with each other. The left and right (with middle piece) are screwed to the pipe head respectively (there is a gasket of sealing material between the rotating contact ring surfaces) and then the two pieces are tightened by the inner thread of the middle piece to be sealed.
It is extremely difficult to complete the installation of the pipeline system without the installation of the union; without the installation of the union, it is impossible to repair or replace the accessories and parts in the pipeline.
