Metal bellows can be defined as elastic vessels that can be compressed by pressure applied to the outer part of the vessel. They can also get compressed when extended under vacuum. When the pressure gets released, the bellows then return to their original shape. Metal bellow seals behave in similar manner; they are seals that become compressed when under pressure from outside the container or when vacuum is present in outer atmosphere. They normally have a rubber ring forming main component of working and they are used in different fields including marine engineering, petrochemicals, oil refineries and offshore platforms.
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