6.3 Operating the rotary vane pump with gas ballast
NOTICE
Risk of damage from condensation in vacuum pump
During operation without gas ballast, condensation may form as a result of the vapor compatibility of
the vacuum pump being exceeded.
► Pump condensable vapors only when the vacuum pump is warm and the gas ballast valve open.
► Allow the vacuum 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 vacuum pump against corrosion.
No intermediate settings possible
An intermediate setting between open and closed is not possible.
The gas ballast valve supplies air to the working chamber of the vacuum pump periodically at the begin-
ning of the compression phase. When pumping down vapors, this air prevents condensation within cer-
tain limits in the vacuum pump.
Required tool
● Flat-tip screwdriver
1
''I''
''0''
2
Fig. 14:
Gas ballast valve
1 Gas ballast valve
2
Gas ballast filter
Behavior with process gases with condensable vapors
► Operate the vacuum pump with gas ballast, i.e. with the gas ballast valve open.
Open gas ballast valve
► To open, turn the screw on the gas ballast valve to the “
I
” position.
Close gas ballast valve
► To close, turn the screw on the gas ballast valve to the position “
0
”.
6.4 Refilling operating fluid
Prerequisites
● Vacuum pump heated to operating temperature
● Vacuum pump switched off
Required consumable material
● Operating fluid
Required tool
● Open-end wrench,
WAF 27
Required aids
● Funnel (optional)
Operation
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