In modern , the metal bellows are often produced with a so-called multi-ply design. To increase both flexibility and stability, multiple thin plies of metal are layered to form the bellow walls. There are two basic design types: The multi-ply and the multi-walled bellows structure. The multi-ply structure consists of a pressure-tight, longitudinally welded outer and inner cylinder of stainless steel. In between these cylinders is an open, spiral cylinder which forms multiple plies depending on the design. The multi-walled structure consists of several concentric, longitudinally welded cylinders. Each cylinder forms a pressure-tight and closed "wall".

Normally types are: axial / angular / lateral expansion joint,

The main advantages of :

Resistance to high and very high pressures

Large movement absorption

Small dimensions

Small adjusting force rates

Optimal compensation in a very small space

Early leak indication (in case of damage) via standard check hole

Complete burst resistance

Possibility of permanent leak monitoring in critical media

Economical use of high-quality, corrosion-resistant materials such as Inconel, Incoloy, Hastelloy, titanium and Tantal

Insulation against structure-borne noise up to 20 dB

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