How precision metal bellows used as spring replacements in mechanical and electrical applications? What are the benefits it offers?

 

I have never seen them used as springs, I have seen them used in measuring pressure or vacuum, and as flexable couplers.

 

I have seen Belleville washers used as springs (e.g., on an armature) and as lock washers (http://en.wikipedia.org/wiki/Belleville_washer). I have seen bellows used for pulse dampeners. It is not clear to me exactly what devices the TS wants to compare. It would help if she would give an example of the applications she has in mind.

John