Corrugation compensator, also known as expansion joint, or expansion joint. The utility model is composed of a bellows (an elastic element) constituting the main body of the bellows and accessories such as an end pipe, a bracket, a flange, a conduit, etc. Mainly used in various pipelines, it can compensate for the thermal displacement of pipelines, mechanical deformation and absorption of various mechanical vibration, play a role in reducing the deformation stress of pipelines and improving the service life of pipelines. The connection mode of corrugated compensator is divided into flange connection and welding. Directly buried pipeline compensators are usually welded (except for trench installation) classification Disposable bellows compensator U-shaped metal expansion joint bellows compensator 3-D special corrugation compensator for pulverized coal Hinge Corrugation Compensator (JJL) Balanced Curved Tube Pressure Corrugation Compensator Spherical QB stainless steel corrugation compensator and so on.