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Instruction book
1.1.1 Air flow (Fig. 1.2)
Air drawn through filter (AF) and check valve (CV) into
compressor element (E) is compressed. Compressed air and
oil flow into air receiver/oil separator (AR). The air is
discharged through the outlet valve via minimum pressure
valve (Vp), air cooler (Ca) and condensate trap (4).
Minimum pressure valve (Vp) prevents the receiver pressure
from dropping below a minimum pressure and includes a check
valve which prevents blow-back of compressed air from the
air net.
1.1.2 Oil system (Fig. 1.2)
In air receiver/oil separator (AR), most of the oil is removed
from the air/oil mixture centrifugally. The balance is removed
by oil separator element (OS). The oil collects in the lower
part of air receiver/oil separator (AR), which serves as oil
tank.
The oil system is provided with a by-pass valve (BV). When
the oil temperature is below 60 degrees Celsius, by-pass valve
(BV) shuts off the oil supply from oil cooler (Co). Air pressure
forces the oil from air receiver/oil separator (AR) through oil
filter (OF) and oil stop valve (Vs) to compressor element (E)
and its lubrication points. Oil cooler (Co) is by-passed.
1 Air filter
2 Oil filter
3 By-pass valve, oil cooler
4 Oil filler plug
5 Oil drain plug, air receiver
6 Oil level gauge
7 Air receiver/oil separator
8 Minimum pressure valve
9 Air cooler
10 Oil cooler
M1 Compressor motor
S3 Emergency stop button
Fig. 1.3 Front view of GA18 VSD
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