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Under all circumstances, the minimum pressure valve (Vp) keeps the pressure in the separator tank
(AR) above the minimum value that is required for lubrication of the compressor element. An
integrated check valve prevents the compressed air downstream the minimum pressure valve from
being vented to atmosphere during unloaded operation. When the compressor is stopped, inlet
valve (IV) closes, preventing compressed air (and oil) to be vented into the air filter.
Oil circuit
Reference
1
2
3
4
Description
Air pressure in the separator tank forces the oil via oil filter (OF) to compressor element (E), where
it acts as sealant, coolant, lubricant and corrosion inhibitive (during stand still periods).
In air receiver/oil separator tank (AR), most of the oil is separated from the air/oil mixture by gravity
and inertia. The remaining oil is separated by oil separator (OS). The oil collects in the lower part of
air receiver/oil separator (AR).
The oil circuit is provided with a thermostatic bypass valve (BV). When the oil temperature is below
its setpoint, the oil cooler is bypassed. Bypass valve (BV) starts opening the supply to cooler (Co)
when the oil temperature has increased to the setpoint temperature. At approx. 15 ˚C (27 ˚F) above
the setpoint temperature, all the oil flows through the oil cooler.
A tropical thermostatic valve (available as an option) offers a higher opening temperature, it helps
avoiding condensate accumulation in the oil. This option is advised when the compressor operates
in high humidity conditions.
18
Figure 8: Flow diagram, oil circuit
Description
Intake air
Air/oil mixture
Oil
Wet compressed air
Instruction book
2920 7196 21
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