Sealing Theory - (Home)
Static vs. Dynamic Sealing
Leakage Control
Lip vs. Squeeze Seals
Effects of Lip Geometries
Friction
Pressure Effects and Extrusion
Seal Wear
Seal Stability
Surface Speed
Compression Set
Influence of Temperature
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| O-Rings,
Seals and Bearings for All Applications |
Leakage Control
When choosing a sealing system, the desired
result is ultimately leakage control. Seal design and
material improvements have made it possible not only to
have seal combinations that provide zero leakage, but
also provide extended life in a variety of applications.
Aside from the seals themselves, a thorough understanding
of system parameters is necessary to obtain the best results.
Optimal sealing is best achieved by taking a systems approach
to the seal package rather than considering components
individually. Our profiles have been designed specifically
to complement one another to create high performance systems.
For example, pairing a Parker rod seal with a Parker wiper
minimizes
fluid leakage and maximizes contamination exclusion. Our
rod seals are designed with knife-trimmed lips to ensure
the best possible film breaking. This dry rod technology
permits the wiper to be extremely aggressive, excluding
contamination without building up oil leakage around the
wiper. Another systems approach to effectively control
leakage is to incorporate multiple sealing lips. Our BR
buffer ring, BT u-cup and AH double-lip canned wiper are
designed to work together to give optimized performance
and the driest sealing available in the industry (see
Figure 2-2). |
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| Figure 2-2 |
Even when appropriate seals are specified, it is still
possible to experience leakage due to factors extending
beyond the seals themselves. Examples are hardware considerations
like surface finish and installation damage, seal storage,
chemical wash downs, maintenance and contamination. Adhering
to the design recommendations found herein not only for
seals, but also for the mating hardware will provide the
greatest likelihood of minimized leakage. |
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