Chapter 4 - Operation; A - Air And Oil Circuits - Chicago Pneumatic CPF 175 Instruction Manual

Chapter 4 - Operation

A - Air and oil circuits

1 - Air circuits (see Fig. 10)
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 oil tank, the
compressed air is pre-deoiled by shocks, then flows through the
oil separator (Item. 49). It then passes through the mini pressure
valve (Item. 34) forming a check valve, the aftercooler (Mark
51A), the condensate separator (in option), and then the outlet
valve (not supplied) to which the distribution pipe is connected.
2 - Oil circuit (see Fig. 10)
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 impurities, and then into the compressor (Item. 20). The oil
temperature is monitored by an electronic box varying the air ventila-
tion to ensure that the temperature of the oil remains constantly at the
optimum. When it leaves the compressor, 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). 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.
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Fig. 10 - Air / oil circuit
34
21
23
Key fig. 10
20 Compressor
21 Suction element
23 Air filter
26 Oil filter
34 Minimum pressure valve
41 Turbine
44 Drain solenoid valve (optional )
49 Oil separator
51 A Air cooler
51 H Oil cooler
55 Condensation water separator (optional )
56 Motor
57 Tank
49
57
26
51H
41
51A
55
44
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