Sealing types
Dynamic Seals Commonly Used in Mechanical Industry Dynamic seals for reciprocating motion

Theoretically, the seal is no longer satisfactory if there is a leak, which translates into the flow of confined fluid from one side of the containment wall to the other under the action of a pressure or concentration difference on either side of the wall.

A leak can have two causes:

• material permeability: even at ordinary temperatures, certain materials can let fluid through through a succession of more or less complex absorption, solubility and desorption phenomena; elastomers, for example, are relatively permeable materials,...