3 Product description
3.1 Function
DuoLine rotary vane vacuum pumps are two-stage, oil-sealed rotary positive displacement pumps for
use in coarse and medium vacuum. The vacuum pumps are equipped with a safety valve that vacuum
seals the vacuum chamber and simultaneously vents the vacuum pump when the pump is at a stand-
still. The rotary vane vacuum pump is available in the standard version with a conventional seal, or as
an M version with non-contact and wear-proof drive with magnetic coupling. The pump housing is her-
metically sealed.
The rotary vane pump Duo 11 ATEX is a vacuum pump designed for special applications in low and
medium vacuum, observing the application limits. A magnetic coupling allows contactless and wear-free
operation of the drive, thus ensuring a hermetically sealed and fully enclosed pump housing. An eccen-
trically mounted rotor in the pump system divides the suction chamber into multiple compartments with
2 radially sliding vanes. The volume of each chamber changes periodically as the rotor rotates. This
provides suction of the gas at the vacuum flange, whereby the gas is then compressed in the suction
chamber via rotation of the rotor and discharged at the exhaust. The gaps between rotor, stator and
vanes are oil-tight to ensure that the pressures are sufficiently reduced to the correct requirements. As
well as providing a sealing function, the operating fluid also serves to dissipate the heat generated by
compression, lubricate the bearing, and discharge impurities from the pumping system. The rotary vane
vacuum pump is fitted with a vacuum safety valve which completely seals the vacuum chambers upon
shutdown of the vacuum pump, while at the same time venting the pump.
1
9
8
7
11
12
13
14
10
2
4
5
3
6
Fig. 2:
Design, construction
1 Circlip of vacuum flange
8
Gas ballast valve
2 Centering ring and blank flange
9
Hose connection for inert gas (installed at the factory
with locking screw)
3 Vacuum flange
10
Base plate
4 Circlip of exhaust flange
11
Drain screw for operating fluid
5 Eye bolt
12
Sight glass
6 Cable bushing for mains connection
13
Cap
7 Motor
14
Filling screw for operating fluid
Product description
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