2: Description 375, 375H, 400HH, 425, 425H T4F User Manual
02250223-036 R01
20 Subject to EAR, ECCN EAR99 and related export control restrictions.
The fluid leaving the filter flows to the compressor unit
where it lubricates, seals and cools the compression
chamber; and lubricates the bearings and gears.
2.5 Compressor discharge system,
functional description
Refer to Figure 2-4. The Sullair compressor unit dis-
charges a compressed air/fluid mixture into the receiver
tank
. The receiver tank has three functions:
• It acts as a primary fluid separator.
• Serves as the compressor
fluid reservoir.
• Houses the air/fluid separator.
The compressed air/fluid mixture enters the receiver
tank
and is directed against the side of the sump. Because of
a change of direction and reduction of velocity, large
droplets of fluid separate and fall to the bottom of the
sump. The small amount of fluid remaining in the com-
pressed air collects on the surface of the separator ele-
ment as the compressed air flows through the separator.
As
mor
e fluid collects on the element surface, it then
flows to the bottom of the separator. A return line (or
scavenge tube) leads from the bottom of the separator
element to the inlet region of the compressor unit. Fluid
collecting on the bottom of the separator element is
returned to the compressor by the pressure difference
between the area surrounding the separator element and
the compressor inlet. An orifice (protected by a strainer)
is included in this return line to assure proper and unob-
structed flow. The receiver tank is code rated at 250 psig
(
17.1 bar) wor
king pressure. A minimum pressure device
located down
stream from the separator, ensures a mini-
Figure 2-4: Discharge system—standard and aftercooled models
1. Engine 6. Non-aftercooled/aftercooled service air valve
2. Strainer 7. Discharge air filters (optional)
3. Minimum pressure/check valve 8. Moisture separator
4. Service air outlet 9. Aftercooler
5. Receiver tank
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