A bellows compensator is a compensation device used to absorb dimensional changes in pipelines, conduits, or containers caused by thermal expansion and contraction by utilizing the effective expansion and contraction deformation of the elastic elements of the bellows compensator. It belongs to a type of compensation element.

The function of metal expansion joints:
1. Compensate for axial, lateral, and angular thermal deformation of the absorption pipeline.
2. Absorb equipment vibration and reduce the impact of equipment vibration on pipelines.
3. Absorb the deformation of pipelines caused by earthquakes and subsidence.