Axial movement metal expansion joint in industrial applications
Metal expansion joints (also called compensators) are compensating
elements for thermal expansion and relative movement in pipelines,
containers and machines.
They consist of one or more metal bellows, connectors at both ends,
and tie rods that depend on the application. They are
differentiated according to the three basic types of movement:
axial, angular and lateral expansion joints.
The axial expansion joint absorbs movement in an axial direction.
Standard connectors of the axial expansion joint are welded ends,
fixed flanges and loose flanges. Axial expansion joints are often
equipped with a guiding tube on the inside of the metal bellows.
This reduces the flow resistance and prevents damage caused by
direct contact with the flowing medium.
Axial expansion joints, which can absorb large movements,
frequently consist of two metal bellows and an inside or outside
sleeve that protects against buckling under internal pressure.
For small nominal diameters, protective tubes prevent mechanical
damage during installation and operation. Axial expansion joints
are suitable for internal and external overpressure.
If pressure is applied to the outside of the metal bellows of axial
expansion joints, the expansion joints permit very large axial
movements in case of internal pressure in a pipeline.