9
Product description
4.2 Function
The vacuum pumps of the DuoLine
®
are dual stage rotary vane pumps and are
used primarily for rough and medium vacuum applications. The pumps are fitted
with a hydraulically controlled vacuum safety valve which, when the pump is at a
stillstand, closes the vacuum chamber vacuum tight and at the same time vents the
pump. The integrated magnetic coupling functions free of contact and friction.
Therefore it is not subjected to any mechanical wear and is completely mainte-
nance free compared to a conventional shaft feedthrough.
Fig. 3: Rotary Vane Pump DUO 20 M
1
Vacuum flange
2
Exhaust flange
15
Main switch
28
Casing
42
Gas ballast valve
80
Base plate
110 Sight glass
198 Operating fluid filler screw
198aOperating fluid drain screw
1
198
2
15
42
110
80
28
198a
