Manufacturer of Metal Expansion Joint and Bellows


There are three basic movements that can be absorbed by an Expansion Joint:

Axial movement

It is the change in dimensional length of the bellows from its free length in a direction parallel to its longitudinal axis. Can be either extension or compression.

Angular movement

It is the rotational displacement of the longitudinal axis of the bellows toward a point of rotation or bending of the expansion joint along its centerline.

Lateral movement

It is the relative displacement of one end of the bellows to the other end in a direction perpendicular to its longitudinal axis.


Metal bellows expansion joints are used as components in piping or as parts of pressure vessels.

An expansion joint is any apparatus containing one or more metal bellows used to absorb dimensional changes such as those caused by thermal expansion or contraction of a pipeline, duct, or vessel and to absorb vibrations caused by engines, pumps, motors, etc.

In other words, a metal expansion joint is a device primarily formed by flexible bellows used to absorb movements in a piping system while containing pressure and a medium running through it.

The key element of an expansion joint is the bellows. The bellows is a flexible element consisting of one or more corrugations and the end tangents.

A corrugation (convolution) is the flexible unit of a bellows and end tangents are the straight un-corrugated portions at the ends of a bellows.

The flexibility of the bellows is derived from the inherent flexibility of the corrugation given its shape and its own design.

In the design and construction of the bellows, in addition to considering that they must be flexible and such flexibility must be controlled, other operating parameters such as pressure, temperature and chemical resistance to fluid passing through them must be taken into account.