Dynamic seals retain or separate fluids, keep out contaminants, and contain pressure. They create a barrier between moving and stationary surfaces in rotary or linear applications such as rotating shafts and pistons. Dynamic seals fall into one of two categories, contact and clearance. Contact seals have the seal bear against its mating surface under positive pressure. Clearance seals operate with positive clearance, meaning there is no rubbing contact. The majority of dynamic seals are contact...
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