Item numbers correspond to the pipe and instrument flow diagram (P&ID) in chapter 13.2.
Fig. 6 Machine overview
1
Compressor air filter
3
Inlet valve
4
Airend
5
Oil separator tank
7
Oil separator cartridge
10
Air distributor
13
Safety relief valve
14
Pressure gauge (on the instrument panel)
15
Engine
16
Oil return line
19
Thermostatic valve (oil temperature con‐
trol)
20
Oil cooler
21
Oil filter
23
Proportional controller
24
Engine air filter
27
Venting valve
28
Fan
37
Minimum pressure check valve
52
Control valve
Ambient air is cleaned as it is drawn in through the filter
1
.
The air is then compressed in the airend
4
.
The airend is driven by an internal combustion engine
15
.
Cooling oil is injected into the airend. It lubricates moving parts and forms a seal between the ro‐
tors themselves and between them and the airend casing. This direct cooling in the compression
chamber ensures a very low airend discharge temperature.
Cooling oil recovered from the compressed air in the oil separator tank
5
gives up its heat in the oil
cooler
20
. The oil then flows through the oil filter
21
and back to the point of injection. Air pressure
within the machine keeps the oil circulating. A separate pump is not necessary. A thermostatic
valve
19
regulates and optimizes the cooling oil temperature.
Compressed air, freed of cooling oil in the oil separator tank
5
, flows through the minimum pres‐
sure / check valve
37
into the air distributor
10
. The minimum pressure/check valve ensures suffi‐
cient internal pressure to maintain cooling oil circulation.
The cooling fan
28
ensures optimum cooling of all components within the enclosure.
4
Design and Function
4.3
Machine function
38
Operator Manual Screw Compressor
M114 SIGMA CONTROL SMART
No.: 901765 05 USE
