face seal

a type of seal in which deformation of the seal is accomplished by a plate or flat surface (face).

Face seal

a device that prevents leakage of fluids along rotating shafts. Sealing is accomplished by a stationary primary seal ring bearing against the face of a mating ring mounted on a shaft. Axial pressure maintains the contact between the seal ring and the mating ring.
Found on http://www.encyclo.co.uk/local/21121
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