Section II - Description
Air Flow
When the compressor is operating,
a partial vacuum is produced at the
compressor inlet. Air entering via the air
filter flows through the inlet valve into
the rotor housing where it is compressed,
then discharged into the air/fluid reservoir.
Compressed air passes through the
complete system, then through a minimum
pressure check valve to the service
connection.
Cooling System
Air-cooled Fluid Coolers
The air-cooled fluid cooler and aftercooler
are finned aluminum tube design. QGB
20 and 30 horsepower models use a one-
piece combination cooler/aftercooler, while
QGB 40 thru 60 horsepower models use
a two-piece design. Ambient air is forced
through the fins by a motor driven fan,
cooling the fluid and air in the tubes. To
maintain proper compressor operation, the
ambient air temperature should not exceed
the temperatures listed in Appendix B
- Technical Data. The cooler fins must
be kept clean at all times. Fluid leaving
the receiver passes through a thermal
mixing valve before traveling on to the
cooler. The purpose of the thermal valve
is to maintain a minimum fluid discharge
temperature at the compressor of
approximately 80°F.
Aftercoolers
Aftercoolers reduce the amount of water
in the discharge air. They are used to
lower the temperature of the discharge
air thereby condensing water vapor from
the compressed air. This allows most of
the contained water to be trapped and
expelled from the unit, reducing water
related problems downstream.
Moisture Separator
A combination moisture separator and
water trap is provided for collecting and
expelling water to the customer’s drain.
Quincy Compressor-QGB
™
7
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