In all circumstances, minimum pressure valve (Vp) keeps the pressure in the separator tank (AR) above a
minimum value, required for lubrication. An integrated check valve prevents the compressed air downstream
the valve from being vented to atmosphere during unloaded operation. When the compressor is stopped, check
valve (CV) and inlet valve (IV) close, preventing compressed air (and oil) to be vented into the air filter.
2.3 Oil system
Flow diagram
Oil system
References Description
1 Compressed air flow to the air outlet valve (Workplace units)
Compressed air flow to the air dryer (compressors with integrated dryer)
A Intake air
B Air/oil mixture
C Oil
D Wet compressed air
Note: The cooling fan is not provided on water-cooled compressors.
Description
In air receiver/oil separator (AR), most of the oil is removed from the air/oil mixture by centrifugal action.
The remaining oil is removed by oil separator (OS). The oil collects in the lower part of air receiver/oil
separator (AR), which serves as an oil tank.
The oil system is provided with a thermostatic bypass valve (BV). When the oil temperature is below its set
point, bypass valve (BV) shuts off the supply to oil cooler (Co) and the oil cooler is bypassed.
Instruction book
18 2920 7109 60
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