The live flange is to use the flange, steel ring, etc. to put the flange on the pipe end, and the flange can move on the pipe end. Steel rings or flanges are the sealing surfaces, and the role of the flange is to compress them. It can be seen that the looper flange is not in contact with the medium because it is blocked by the steel ring or the flange. Because the flange is movable and is not directly connected to the pipeline, it is called a live flange, and there is another way to call it a loose sleeve flange.