Quincy Compressor QGD 40, Инструкция

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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
Flow diagram, oil circuit
Reference Description
1 Intake air
2 Air/oil mixture
3 Oil
4 Wet compressed air
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.
Instruction book
2920 7190 02 19