6.3 Operation with gas ballast
NOTICE
Risk of damage from condensation in pump
During operation without gas ballast, condensation may form as a result of the vapor compatibility of
the pump being exceeded.
► Pump condensable vapors only when the pump is warm and the gas ballast valve open.
► Allow the pump to run on after process end for another 30 minutes with the gas ballast valve
open.
– This cleans the operating fluid and protects the pump from corrosion.
If process gases contain condensable vapors, the rotary vane pump must be operated with gas ballast
(i.e. with the gas ballast valve open).
6.3.1 Gas ballast valve – standard version
To avoid condensation of condensable vapors in the pump when pumping them down, air is fed into the
working chamber periodically via the gas ballast valve at the start of the compression phase.
The gas ballast valve is closed when turned to the right to position "
0
" and open when turned to the left
to position "
1
". Intermediate settings are not possible.
1
0
1
0
Fig. 19:
Gas ballast valve, standard version
6.3.2 Gas ballast valve with flushing gas connection (option)
NOTICE
Risk of damage from unacceptably high flushing gas pressure
Increased flushing gas pressure compromises the operational reliability of the pump, and causes in-
creases in power input and operating temperature.
► Observe the maximum permissible flushing gas pressure of
1,500 hPa (absolute)
.
► Dose the flushing gas quantity with the dosing screw in the gas ballast valve or on site.
The ingress of flushing gas dilutes the process gas and avoids condensation in the pump.
Operation
32/66
