Bellows mainly include metal bellows, bellows expansion joint, bellows heat exchange tube, diaphragm box and metal hose, etc.Metal bellows are mainly used to compensate thermal deformation of pipelines, shock absorption, settlement deformation of pipelines and so on. They are widely used in petrochemical, instrumentation, aerospace, chemical industry, electric power, cement, metallurgy and other industries.Plastic and other materials bellows in the medium transport, power threading, machine tools, home appliances and other fields has an irreplaceable role.