Common type compensator lateral displacement (expansion joints, expansion joints, expansion joints, bellows) common type bellows expansion joints to compensate for axial displacement of the main pipe and a small amount of compensation pipes, shock absorbing noise, simple design with piping , easy installation and low cost. However, when used in large-diameter piping systems due to excessive internal pressure thrust, paying particular attention to the strength of the mounting bracket, side mounting bracket collapse phenomenon occurs. Universal compensator is used alone compensate for axial or lateral displacement of the small pipe but not alone as angle compensation.