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The recommended procedure to vent the system
and the pump avoiding the contact between the
pump bearings and the corrosive gas is described
in the following points:
1.
Close the corrosive gas flow into the system.
2.
Leaving the Turbo-V pump and the backing
pump running and the purge gas flowing, wait
for enough time to evacuate the corrosive gas
from the system.
3.
Turn off the Turbopump.
4.
Open the Turbo-V vent port slowly until to
reach atmospheric pressure in the system.
5.
Turn off the Turbopump.
6.
When the Turbo-V pump and the backing
pump are stopped and the system is at at-
mospheric pressure, for a better bearing pro-
tection it is advisable to leave the purge gas
flowing into the Turbo-V pump, with the
chamber or the Turbo-V vent valve opened, to
avoid system overpressures. If the vent valve
can't be kept opened, the backing pump
should be left operating.
TYPICAL LAYOUT DIAGRAM
1.
2.
3.
1. Purge gas line
2. Pressure
4.
regulator
3. Gas purge valve
5.
4. Gas purge port
5. Forevacuum
6.
pump
6. Turbopump
7.
7. Vent valve
8.
9.
10. Fore-vacuum pump control relay
11. Connection for water cooling
12. Roughing line with valve (optional)
13. Turbopump
14. Fan
15. Flexible connection
33
TECHNICAL INFORMATION
Turbo-V controller
Vent valve
Vacuum pump shut-off valve (optional)
System vent valve (optional)
Vacuum chamber
Ionisation gauge
Fore-vacuum pump connecting flange
Oil mist eliminator
Fore-vacuum pump with internal one-way
valve
87-900-892-01(D)
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