Compensator is customary, also known as expansion joints, or expansion joints. Constituting the main body of the work by the bellows (an elastic element) and the end of the tube, brackets, flanges, conduits and the like accessories. Is a form of compensation components. Main body of the bellows with its work effectively stretching deformation to absorb axial pipe, conduit, container, etc. Dimensional changes caused by thermal expansion and contraction and other reasons arising from, or compensation lines, conduits, containers, etc., lateral and angular displacement. Can also be used for noise damping. Widely used in modern industry. On heating, the heating pipes in order to prevent warming, temperature stress due to thermal elongation or deformation or damage caused by the pipeline, you need to set compensation on the pipeline in order to compensate for the heat pipe elongation, thereby reducing stress and wall acts on the valve member or scaffold structure forces.