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US Bellows is a Standards Subscriber | Exp: Dec 31, 2026 | See ejma.org to check verification process
Celebrating 25 years of EJMA membership

How does an expansion bellows function?

A bellows functions by compressing or extending according to the axial motion that is required in the piping system.

Please see video below of a metallic bellows being cycle tested to verify how many cycles a bellows can withstand before failing.