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bock seals are devices that prevent fluid leakage, consisting of at least one pair of faces perpendicular to the axis of rotation that remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, along with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are sometimes used as auxiliary seals; since rubber bellows have limited elastic force, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals". bock