SKF bearing housings are supplied with various seals, depending on the type of housing. Where the split plummer block housings are concerned there is generally a choice of seals. The available seal types include
radial shaft seals
relubricable heavy duty "taconite" seals
special oil seals
as well as combinations of seals.
Labyrinth seals (fig 1
) are suitable for high speed operation and seal well except against liquid spray.
Double-lip seals and radial shaft seals
Double-lip seals (fig 2
) and radial shaft seals (fig 3
) are contact seals and provide reliable sealing against most media. The operating speed is limited by the permissible circumferential speed for the sealing lip(s) as for all contact seals.
V-ring seals (fig 4
) seal axially and are thus not dependent for their efficiency on the quality of the shaft counterface in contrast to radial shaft seals, for example. V-rings are also suitable for use on vertical shafts although care must be taken that they face in the right direction.
These heavy-duty seals can be relubricated and are made up of several sealing elements. Fig 5
shows a TSN .. ND seal.