Page 341 - SKF-bearing-housings

Sealing solutions

Sealing solutions Fig. 7
Multi-seal
Multi-seals
SED plummer block housings are supplied Labyrinth seal cover
standard with a multi-seal on each side, which
consists of an integrated labyrinth seal and a
three stage labyrinth ring. An O-ring holds the Radial seal
labyrinth ring in place on the shaft. The radial cover
shaft seal is installed in the radial seal cover,
which is then mounted onto the labyrinth seal Radial
shaft
cover. seal
The multi-seal is designed for both grease
and circulating oil lubrication. The seal can be
relubricated via a grease fitting in the radial 6
seal cover († fig. 7).
Table 1 provides an overview of the charac-
teristics and suitability of the multi-seal. This
information should be used a guideline, which
cannot substitute for testing a seal in its Table 1
application. Multi-seals for SED plummer block housings
Seal
End covers Type Integrated labyrinth and
radial shaft seal
SED housings are supplied with a cover for
either shaft ends or through shafts: Material grey cast iron,
nitrile rubber
• Housings with a cover for shaft ends have Application conditions
and requirements
the designation suffix A.
• Housings with a cover for through shafts Temperature [°C] –40 to +100
have the designation suffix B. Temperature [°F] –40 to +210
Max. circumferential 7,5
For details about the permissible length of speed 1) [m/s]
the shaft end, contact the SKF application Max. misalignment [°] 0,3
engineering service.
Low friction suitable
Shaft tolerance class h9V E
Shaft roughness R a [µm] ≤ 3,2
Sealing suitability

Dust ++
Fine particles ++
Coarse particles ++
Chips ++
Liquids when sprayed +
Direct sunlight ++
Symbols: ++ very suitable + suitable

1) Limited by the radial shaft seal

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