Bellows mainly include metal bellows, corrugated expansion joints, corrugated heat exchange tube, diaphragm membrane box and metal hose. Metal bellows are mainly used for compensating thermal deformation of pipelines, damping, absorption of pipeline settlement deformation and other functions, and widely used in petrochemical, instrumentation, aerospace, chemical industry, electric power, cement, metallurgy and other industries. Other materials are widely used in medium transmission, power threading, machine tools, home appliances and other fields.

Bellows are a kind of elastic element in pressure measuring instrument. It is a cylindrical thin-walled corrugated shell with multiple transverse ripples. It is elastic and can produce displacement under the action of pressure, axial force, transverse force or bending moment.

In addition, bellows can be used as sealing isolation elements to separate the two media or prevent harmful fluid from entering the measuring part of the equipment; It can be used as a compensation element to compensate the temperature error of the instrument by the variability of its volume. It can be used as elastic joint of two parts.

Bellows according to the material can be divided into metal bellows, non-metallic bellows two kinds; According to the structure can be divided into single and multi-storey. Single layer wave is widely used, with high strength, good durability and low stress. Bellows are usually made of bronze, brass, stainless steel, monel alloy and inkal alloy.

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