Edge Welded Bellows

Hydraulically formed, or hydroformed, bellows can typically travel about twenty percent of their free length. Edge welded metal bellows have the ability to travel ninety percent; thus, edge welded bellows can accomplish the same movement in smaller sizes and lighter weight assemblies. Bellows accumulators can have pressure internal or external to the bellows assembly. This design factor should be defined early in the design phase since the assembly will ideally receive internal pressure. Understanding the differential pressure between the inside and outside of the assembly also helps engineers to determine the proper size and length of the bellows assembly

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