Compressor Discharge System, Functional Description - Sullair 12 Series Operator's Manual

Section 2
DESCRIPTION
2.5 COMPRESSOR DISCHARGE SYSTEM, FUNC-
TIONAL DESCRIPTION.
Refer to Figure 2-4.
charges the compressed air/fluid moisture through
a discharge check valve into the combination re-
ceiver/sump. The discharge check valve prevents
air in the receiver from returning to the compression
chamber after the compressor has been shut down.
The receiver has three basic functions:
1. It acts as a primary fluid separator.
2. Serves as the compressor fluid sump.
3. Houses the final fluid separator.
The compressed air/fluid mixture enters the re-
ceiver and is directed towards the bottom of the
Figure 2-4 Compressor Discharge System
8
The compressor unit dis-
separator element. The direction of movement is
changed and its velocity significantly reduced, thus
causing the large droplets of fluid to fall to the bottom
of the receiver/sump. The fractional percentage of
fluid remaining in the compressed air collects on the
surface of the separator element as the com-
pressed air flows through the separator. A return
line (or scavenge tube) leads from the bottom of the
separator element to the inlet region of the compres-
sor unit. Fluid collecting on the bottom of the separa-
tor is returned to the compressor by a pressure dif-
ferential between the receiver and the compressor
inlet. A visual sight glass is located on the return line
to observe this fluid flow. There is also an orifice in
this return line (protected by a strainer) to assure
proper flow. A gauge, located on the instrument