The savvy seal designer recognizes both the possible uses and the inherent limitations of a given product. Though the standard shaft seals shown previously are ideal for a wide variety of applications, they are not the best solution to every design problem.

Since trying to force a standard shaft seal to perform beyond its capabilities can only lead to failure, you will probably be faced from time to time with difficult or unusual situations that require you to consider other seal cross-sections. Or, perhaps you can save money or simplify installation while still satisfying an application’s needs by using a different design.

What follows is information on other sealing options that operate in place of (or in addition to) standard shaft seals. Each alternative has both advantages and disadvantages, so the specific needs of your application will always dictate which one is best for you. Familiarity with your options, however, should make the choice somewhat easier.

DOUBLE LIP SEALS
HYDRODYNAMIC SEALS
FLANGE SEALS
UNITIZED (CASETTE) SEALS
TRIPLE LIP (MUD) SEALS
ROTATING BORE SEALS
HIGH ECCENTRICITY SEALS
PTFE SEALS
AXIAL DIRT LIP SEALS
HIGH PRESSURE SEALS
LINEAR (RECIPROCATING) SEALS

“Though the standard shaft seals shown previously are ideal for a wide variety of applications, they are not the best solution to every design problem.”