What are the types of bellows?
Release date:
2024-03-22
Bellows are primarily classified into metal bellows (made of stainless steel or carbon steel) and plastic bellows. Metal bellows are mainly used to compensate for thermal expansion and contraction in pipelines, reduce vibration, and absorb settlement-induced deformation; they are widely employed in industries such as petrochemicals, instrumentation, aerospace, chemicals, power generation, cement, and metallurgy. Plastic and other material bellows play an irreplaceable role in applications like fluid conveyance, electrical cable routing, machine tools, and household appliances.
A tubular elastic sensing element formed by connecting collapsible corrugated sheets along the direction of folding and expansion. Its open end is fixed, while the sealed end remains free; auxiliary helical springs or reeds are employed to enhance its elasticity. During operation, internal pressure causes the tube to elongate along its length, producing a displacement at the movable end that bears a defined relationship to the applied pressure. The movable end drives a pointer, enabling direct indication of the pressure magnitude. Bellows are often combined with displacement sensors to form electrical‑output pressure transducers and may also serve as isolation elements. Because bellows require substantial volumetric changes to achieve extension, their response speed is lower than that of Bourdon tubes. Bellows are well suited for measuring low pressures.
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