Profile: Botou Tongyong Bellows Manufacturing Co. Ltd specializes in providing metal corrugated compensators. We also offer non-metallic compensators, expansion joints, pipeline expansion joints, ventilation butterfly valves, metal hose, star type unloader, rubber joint, sleeve compensator, pipeline filters, valves and pipe fittings. ​Thick-walled expansion joints are also called thick-walled corrugated compensators. They generally refer to flexible parts arranged on the shell of a fixed tube-sheet heat exchange equipment to absorb the shaft caused by the different wall temperatures of the tube side and the shell side of the pressure vessel. Screw conveyor is a machine that uses a motor to drive spiral rotation and push materials to achieve the purpose of conveying.