Industrial shaft seals

gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21,
Industrial
факс
shaft seals
(495) 22
Cover plates
All HS type seals, split and solid are 0,4 to 0,8
mm (0.016 to 0.031 in) wider than the bore
depth and have outside diameters that are 2 %
to 5 % larger than the seal housing bore. The
end user is required to fabricate and use a
cover plate for proper fit. The cover plate
provides axial compression and supplements
radial press fit to ensure maximum seal
performance. It should be thick enough not to
bend or distort. Generally, a thickness of 6,35
to 12,7 mm (0.250 to 0.500 in) is sufficient.
The plate should be secured with bolts, no
more than 150 mm (6 in) apart, on a bolt
circle located as close to the seal housing bore
as practical. The cover plate should be flat and
the housing bore depth uniform. Splitting the
cover plate at 180° will make seal replacement
easier, particularly in confined areas.
To block surges of lubricant towards the seal
from the inside and to protect the seal from
damage from the outside, it is recommended
that the cover plate inner diameter be as close
as practical to the shaft. Generally, 6,35 mm
(0.250 in) over shaft diameter is sufficient in
the presence of shaft misalignment and run
out.
Sometimes, supplementary sealing needs to
be added. It is impractical to machine the
original housing to provide the seal cavity
required. In such instances, the seal cavity may
be incorporated into a new plate, which is
bolted into place as illustrated (fig 66).
New seal cavity plate
Seal
retaining
cover plate
6,35 mm
(0,250 in)
Sealing element
Fig 66
gab.ru Берг АБ bergab@ya.ru Тел. (495)-228-06-21, факс (495) 93 22