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Technical Information/Glossary of Terms
|High Vacuum Equipment-Glossary of Terms 1
[Term]Shaft Sealing Method
Bellows
Bellows offer cleaner sealing with reduced particle generation and less outgassing. The two major bellow types are: Formedbellows and Welded-bellows. Formed-bellows produce less dusts and offer higher dust resistance. Welded-bellows allow longer strokes, but generate more dust particles and offer less dust resistance. Please note, the endurance depends on length and speed of the strokes.
O-ring, etc.
Due to entrainment of gases and generation of particulates, vacuum performance is somewhat inferior to the bellows type. However, high speed operation is possible and durability is comparatively high. In general, fluorinated grease is affixed to the shaft seal portion.