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Bellows seals

Another special form of dynamic sealing is the so-called bellows. Primarily axial movements are sealed with bellows.

Both pointed notched and round shaped bellows are used. Although the pointed notched bellows offer greater extensibility and flexibility, they are much more notch-sensitive due to their design and are therefore only suitable for lower pressure.

Due to their shape, only relatively tough plastics that are not very notch-sensitive can be used as bellows. Modified or reinforced plastics can therefore not be used. In addition to fluoroplastics with their comparatively high ductility, unfilled polyaryletherketones, and rarely also polyacetals, are mainly used. For high loads, bellows made of Victrex® PEEK™ in particular have proven to be very effective.

• Acetron® – at low temperatures and loads
• Polytron PVDF 1000 – for moderate temperatures and higher loads
• Polytron PTFE 1000 – for high temperatures and best chemical resistance
• Victrex® PEEK™– for increased temperatures and higher mechanical stress
• Victrex® HT (PEK) – for increased temperatures and heavy mechanical stress
• Victrex® ST (PEKEKK) – for increased temperatures and even higher mechanical stress
  

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