They are manufactured by a single bellows, allowing just one angular rotation in a single plane, since they are made up with articulation attached at the ends of the expansion joint and bound together by pins.

They resist pressure thrust caused by internal pressure. For a proper use they must be installed with three expansion joints or in pairs.

It is possible to compensate remarkable expansions with very small thrust on fixing points, depending on the installation’s interaction between the joints.

Moreover, they can also be manufactured with steel bellows or special alloys, according to their use, for example AISI 316Ti, AISI 310, HASTELLOY, INCONEL, AVESTA 904L, MONEL 400, INCOLOY, and with the ends in special materials like CORTEN, A335 P11, A333 Gr.6 and others upon request.