Page 458 - SKF-bearing-housings

Split pillow blocks SDAF series including the extended range (inch dimensions)

Sealing solutions Labyrinth seals
Labyrinth seals are the standard sealing solu-
SDAF housings are available with the following tion for all SDAF housings. They form a multi-
sealing solutions († fig. 4): stage labyrinth seal with the seal grooves in
the housing. If operating conditions require it,
• labyrinth seals (standard) the sealing effect can be enhanced by filling
• labyrinth seals with an internal contact the cavity between the housing and labyrinth
element (PosiTrac Plus) ring with grease.
• taconite heavy-duty seals
• contact seals Labyrinth seals for SDAF housings
• end plugs (end covers) SDAF housings are supplied with either stand-
ard labyrinth seals (designation LER) or Posi-
PosiTrac, PosiTrac Plus and contact seals are Trac labyrinth seals (designation LOR). Both
not available for SDAF extended range are made of aluminium († fig. 4). The Posi-
housings. Trac labyrinth seals have an additional O-ring
Table 1, page 456, provides an overview of made of acrylonitrile-butadiene rubber (NBR)
the characteristics and suitability of each seal- to make the labyrinth ring rotate with the
ing solution. Details are provided in the follow- shaft. Whether the standard labyrinth seal or
ing text. This information should be used as a the PosiTrac seal are supplied depends on
guideline, and does not substitute for testing a housing size.
seal in its application. Tables 2 and 3 on
page 458 and 460 provide an overview about
which seals fit what housing.
Fig. 4

Labyrinth seal PosiTrac seal PosiTrac Plus seal Taconite seal
LER …, ERF … LOR ... TER ...

Taconite seal Contact seal End plug
TER-V...

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