Special-Duty / Application-Specific
Vacuum Bellows
A vacuum bellows is designed for the opposite loading condition from a standard pressure bellows: instead of resisting outward pressure, it has to resist collapsing inward under negative (below-atmospheric) internal pressure.
How it works
Convolution geometry and wall thickness are engineered for column stability under external atmospheric load pressing in, which is a meaningfully different design case from sizing a bellows against internal pressure pushing out.
- Resists inward collapse under negative internal pressure
- Convolution geometry engineered for external-load stability
- Wall thickness driven by vacuum rating, not positive pressure
- Common in vacuum process equipment and instrumentation lines
Related: Cryogenic Bellows · Externally Pressurized Bellows · Contact
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