1
2
3
6
5
7
8
9
10
11
12
13
4
Fig. 4:
Structure of the rotary vane pump
1 Motor
8
Filler screw for operating fluid
2 Motor terminal box
9
Sight glass
3 Crane lug
10
Drain screw
4 Gas ballast filter
11
Rubber-metal bumper
5 Vacuum connection
12
Operating fluid separator
6 Exhaust connection
13
Operating fluid filter
7 Axial fan with oil/air heat exchanger
3.1.1 Operating fluid
The pump oil, also known as operating fluid, fulfills various tasks in a rotary vane pump:
● lubrication of all moving parts
● filling part of the dead volume under the exhaust valve
● sealing the gap between the intake and exhaust channel, and between the vanes and the working
chamber
● ensuring an optimal temperature balance through heat transfer
3.1.2 Cooling
The rotary vane pump is cooled by thermal radiation from its surface, the air flow of the two fans and the
pumped gas.
3.1.3 Gas ballast system
The gas ballast system supplies air to the working chamber of the rotary vane pump periodically at the
beginning of the compression phase. When pumping down vapors, this air prevents condensation within
certain limits in the rotary vane pump. The gas ballast valve affects the final pressure of the rotary vane
pump.
3.1.4 Operating fluid return via the float valve
Function of the operating fluid return
The operating fluid return functions only at an operating pressure of < 800 hPa.
The rotary vane pump is equipped with an operating fluid return as standard. If the operating fluid col-
lected in the operating fluid separator reaches a certain level, a float valve opens and the ejected oper-
ating fluid is returned to the intake port of the vacuum pump.
Product description
18/62
