Industrial shaft seals

gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21,
Industrial
факс
shaft seals
(495) 22
Replacement
Once a radial shaft seal has been removed
during maintenance work, it should never be
re-used. The lip of the replacement seal should
not be allowed to run on the same path as the
lip of the old seal. There are several ways to
achieve this:
N rework the counterface (this entails
removing the shaft),
N replace a ring which has served as a
counter surface,
N use a Speedi-Sleeve,
N mount a spacer ring in the housing bore
between the housing shoulder
and the seal (fig 67),
N press in the new seal to a different depth
in a cylindrical opening in the housing.
Fig 67
When necessary, the counter surface should
always be displaced towards the side of the
medium to be sealed.
When choosing replacement seals care
should be taken to see that the design and
material correspond to the original. In case of
doubt, a higher quality seal should be used to
ensure that it can withstand the operating
conditions, e.g. with respect to pressure,
temperature etc., and that it is compatible with
the medium to be sealed.
Seals made of a different material should
only be used if absolutely necessary. In such
cases the recommendations given in Table 17
may be followed. The order in which the
materials are listed gives an indication of their
suitability. Other choices can be made, but
these may lead to a considerably shortened
seal life.
If a seal of the same design is not available
in the same width as the original, then a
somewhat narrower seal can be used, or if the
depth of the housing bore allows, a somewhat
wider seal can be chosen as the replacement.
Table 17. Replacement scaling lip materials
Original
Felt
Leather
Nitrile rubber
Polyacrylate elastomer
Silicone rubber
Replacement
Nitrile rubber
Polyacrylate elastomer
Fluoro rubber
Nitrile rubber
Fluoro rubber
Polyacrylate elastomer
Fluoro rubber
Silicone rubber
Fluoro rubber
Silicone rubber
Fluoro rubber
gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 22