BOA Metal bellows

Flexibility and tightness at the highest level of precision

BOA metal bellows are produced from ductile metallic materials for a durable lifetime lasting.

Edge welded bellows & formed bellows

We offer two different kinds of metal bellows:

Edge welded bellows
Formed bellows

The basic element for formed bellows, a thin-walled cylindrical tube, is formed into corrugations using hydraulic or mechanical pressure. Different procedures and corrugation geometry are adopted depending on the production quantity and application.

Edge welded bellows are manufactured with individual metal diaphragms that are welded together.

Long life expectancy

Whether formed or edge welded, BOA metal bellows:

are extremely flexible,
have a long life expectancy,
do not need any maintenance,
are resistant to pressure and to temperature,
are vacuum-tight.

BOA Group comparison edge weld Metal Bellows Overview

Applications for metal bellows

BOA metal bellows are typically used as:

shaft seals of valves
vibration absorbers in laser systems
volume compensators in transformers
actuators in measurement and control applications
flexible connection between solar panels
sealing or ducting elements in vacuum applications
temperature sensors
surge arrestors
reservoirs to store fluids
pressure sensors

Characteristics of edge welded bellows & formed bellows

Formed bellows

Characteristics of BOA formed bellows:

single or multi-plied
offer considerable axial, lateral or angular movements
diameter 6 to 2100 mm
can have a special coating (cu, au) and surface finishing
made from special materials like titanium, NI-alloys
special thermal treatment’s

Metal Bellows hydroformed copp Metal bellows welded

Welded bellows

Characteristics of BOA welded bellows:

single or multi-plied
diameter 6,4 to 584 mm
almost unlimited span (distance ID to OD)
compressible to solid height
have a much longer stroke per convolution
can be made of any rollable, weldable metal
extremely low spring rates possible
resistant to nicks and dents
a high degree of translational & arcuated motion
diaphragms: wide thickness range

How can we help you?

If you want any information or if you need any help? Just visit our online expert center. Here you find information on all our products or you can contact one of our engineers about your challenge. We will be glad to support you.

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