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Section 4 - Operation
A - Air and oil circuits
1 - Air circuit (see Fig. 4)
The air is sucked into the compressor through a filter (item. 23).
This air passes through the compression element where it is mixed
with oil injected during compression. Inside the tank, the
compressed air is separated by shocks and then flows through the
oil separator (item. 49). It then passes through the Minimum pres-
sure valve (item. 34) including a check valve, the final cooler
(item. 51A), condensate separator and finally the outlet valve (not
supplied) to which the distribution pipes are connected.
2 - Oil circuit (see Fig. 4)
The oil, under discharge pressure, flows from the bottom of the tank
through the cooler (item. 51H), the oil filter (item. 26) which retains
solid particles, and then into the compressor (item. 20). At each cold
start, the thermostatic valve (item. 47) short circuits the oil cooler,
thus enabling the optimum operating temperature to be reached quickly.
When it leaves the compressor element, the oil returns to the tank.
Part of the oil remains suspended in the air as mist. This mist
passes through the oil separator. (item. 49). A fraction of this oil
agglomerates in large droplets which return to the tank through
the force of gravity. The remaining oil, which is separated by the
last stage of the oil separator, is drawn up by a dip tube and
dispatched to the compressor.
AIR
OIL
AIR / OIL
23
20
01/2008
Page 10
Fig. 4 - Air / oil circuit
26
21
34
28
56
20.
Compressor
21.
Suction housing
23.
Air filter
26.
Oil filter
28/29/30.
Flexible oil hose
31/32.
Flexible air hose
34.
Built in minimum pressure valve / Filter support
43.
Drain valve
47.
Thermostatic valve (built in filter support)
49.
Oil separator
51 A.
Air cooler
51 H.
Oil cooler
56.
Motor
57.
Oil tank
49
57
51H
43
30
Key Fig. 4
31
29
47
51A
32
Chicago Pneumatic Compressors
62 305 454 65
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