Bedienungsanleitung KXE - REITZ Ventilatoren

7.4.3 Seal with special rings
Figure 11
7.4.4 Shaft seal with grease barrier
Figure 12
7.4.5 Shaft seal with sealing gas
Figure 13
BWA-KXE-Fetteinzelstehlager_englisch_02.doc
Maintenance
The shaft seal can be provided with one or two graphite
rings. This type of seal is also called labyrinth seal.
Lubrication of this sealing type is not possible.
Figure 11� Presentation of shaft seal with one
graphite ring
For improving the leak tightness a grease barrier can be
used. The grease barrier reduces the gas penetration
through the shaft seal.
Usage of the lubricator enables a maintenance-fee operation
of approximately 3 months.
Figure 12� Presentation of shaft seal
If sealing gas is used, it must be ensured that the pressure of
the sealing gas is always higher than the pressure at the
shaft seal that is created by the fan operation. Vacuum operation
means higher sealing gas pressure than the maximum
static pressure increase, pressure operation means
higher sealing gas pressure than the total pressure increase.
It is obligatory to observe the instructions of the seal manufacturer.
Please note: Request technical data regarding minimum and
maximum sealing gas pressure from the manufacturer.
Equal or lower sealing gas pressure would enable
the penetration of solid matters into the sealing system
and therewith an increased wear or, in the worst
case, a total breakdown of the seal could be caused
Monitor the sealing gas consumption or the leakage
continuously. A significant increase of the values
points out wear of the sealing rings and / or repair
While carrying out inspection works, the shaft seal must be
checked for damages (e.g. corrosion) and must be cleaned.
If sealing components are damaged (scratches, cracks,
dents) the complete seal set must be renewed.
Figure 13� presentation of shaft seal
7.6