Metal bellows expansion joints have been widely used in various industrial sectors. In order to meet the different use requirements of different occasions, different forms and different varieties of expansion joints have been designed and manufactured.

    In the instrumentation industry, various high-precision sensitive components are mainly used. It is characterized by small structural size, high dimensional accuracy requirements, and relatively high performance requirements such as stiffness.

     The bellows in the pressure vessel manufacturing industry usually adopts thick-walled single-layer, the corrugated size is relatively large, and the thickness is in the range of ten millimeters or even tens of millimeters. However, with the expansion of the application range of pressure vessels, multi-layer bellows for high-pressure vessels have also been widely used.

    In the application of heat pipe network, large axial or radial displacement is often required. The general displacement range is between 100 and several hundred millimeters. And the required design pressure is often 1.6~2.5MPa. Therefore, the use requirements have produced structural forms such as external pressure steel sleeve type, compound pull rod type and compound hinge type.

    In some industries, various pipelines have both large displacement requirements and anti-corrosion and wear-resistant performance requirements. In this application, a large number of corrugated pipes made of corrosion-resistant alloys or super stainless steel are used to expand Festival. In the inner lining of some expansion joints, wear-resistant materials are sprayed or surfacing, or wear-resistant ceramic sheets are pasted.

    in some machinery manufacturing industries. Due to the limitation of the structural size of the equipment, the size of the bellows expansion joint is subject to various constraints. There are not only the limitation of the inner and outer diameter of the bellows, but also the limitation of the length of the bellows, as well as the requirements of larger displacement and higher service life. For example, the diesel engine bellows used in marine diesel engines is a product that needs to meet the above-mentioned performance requirements.