The mechanical seal has 3 main design features-the sealing surface-is flatly covered in 2-3 light bands. Flatten the sealing surface within a millionth of an inch. Since the two faces overlap the plate and are then pressed together, it effectively seals off any fluid leaking between them.
Auxiliary Seals-Sealing Faces When sealing perpendicular to the shaft, an auxiliary seal must be used, which is common to industry standard Types 1, 2, 21, 6 and 6A. Seal parallel to the shaft. These seals include rubber boot O-rings made of various elastomers, including Buna-N, Viton, Aflas, Karlez, Chemrez, Amerirez, PTFE, SBR, neoprene, and FEP sealing O-rings. Made of gaskets or elastomers the same as above, as well as flexible graphite and compressed non-asbestos materials. For high temperature metal bellows sealing flexible graphite wedges are used to seal pump sleeves / shafts.
A kind of energization-this is performed using a single spring, wave spring, metal bellows, multiple springs, and even O-rings to form internal pressure, but the force created by one of the above must be used to press the sealing surfaces together to prevent the leakage.
