A: The terminology can be confusing and often words have no universally accepted meaning. We use the following definitions but the terms “bellows” and “expansion joint” are typically considered as interchangeable:
> Expansion Joint - an expansion joint is a complete unit with metal bellows or rubber bellows and end fittings, plus, optionally, liner, cover and external hardware. Other terms used - compensator, flexible connector
> Rubber Bellows - the flexible element within a rubber expansion joint
> Metal Bellows - the flexible element within a metal expansion joint
> Liner - The liner fits within the expansion joint under the metal bellows or rubber bellows to prevent the flowing media directly impinging on the bellows, this reduces flow disturbance and allows the temperature of the bellows to be controlled in the design.
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