Seal Design > Considerations
Considerations, Part 1
many situations, it is very important to understand the anticipated
response of an elastomer under a given compressive load. The compression/deflection
curves for various elastomers are functions of the hardness (and
bulk modulus) as well as the cross-sectional diameter.
applications may present unique challenges to elastomeric seals.
Elastomers are essentially high-viscosity liquids-and as such
will flow under extreme pressure conditions. In applications where
the clearance gap is larger than that recommended for a traditional
o-ring seal, the user should consider backup rings. These flat
or contoured rigid rings are inserted on the lowpressure side
of the gland to prevent extrusion. Consideration of backup rings
requires additional gland width to allow for elastomer expansion.
In addition, chemical compatibility and ease of installation are
other considerations when using backup rings.
noncircular glands may present challenges for seal design. The chart
at the right illustrates the minimum recommended bend radius for
irregular glands. Smaller, sharper radii may result in excessive
stress and seal damage.
Topic Gland Design Special
Considerations, Part 2
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