Section 2
DESCRIPTION
8
At low temperatures, the fluid passes through the
thermal, the fluid filter, and then directly into the
vacuum unit. As the discharge temperature rises
above 175°F (79°C), due to the heat of compres-
sion, the cooler fluid bypass valve begins to close
and a portion of the fluid then flows through the
cooler; from the cooler to the fluid filter, and then to
the vacuum unit.
A portion of the fluid is routed to the anti-friction
bearings which support the rotors inside the vacu-
um unit. Prior to entering the vacuum unit the fluid
flows through the fluid filter, thus assuring properly
filtered lubricant for bearing supply and rotor injec-
tion.
The fluid filter has a replacement element and an
integral pressure bypass valve.
The pressure regulators are factory set prior to
delivery. One regulator is to protect the system
from over pressurization due to a possible down-
stream blockage in the piping. The other regulator
controls the injection pressure to the vacuum unit.
2.5 DISCHARGE SYSTEM, FUNCTIONAL DESCRIP-
TION
Refer to Figure 2-3. The vacuum unit discharges
compressed gas/fluid mixture into the combination
receiver/sump. The receiver has three main func-
tions:
1. Acts as the primary fluid separator.
2. Serves as the fluid sump.
3. Houses the final fluid separator element (s).
The compressed gas/fluid mixture enters the sump
and is directed against the side of the tank. Its
direction of movement is changed and its velocity
significantly reduced, causing large droplets of fluid
to form and fall to the bottom of the sump. The frac-
tional percentage of fluid remaining in the com-
pressed gas collects on the surface of the separa-
tor element(s) as the compressed gas flows
through the separator. A return line (or scavenge
tube) leads from the bottom of the separator ele-
ment(s) to the inlet region of the vacuum unit. Fluid
collecting on the bottom of the separator(s) is
returned to the vacuum unit by the pressure differ-
ence between the receiver and the vacuum unit
inlet. Sight glasses are located in the return line for
the observance of this fluid flow. A gauge located on
top of the electrical enclosure indicates abnormal
pressure drop through the separator element. At
this time, separator element replacement is neces-
sary.
All Sullair vacuum systems are equipped with a
high pressure shutdown switch to shut down the
Figure 2-3 Vacuum Unit Discharge System
KEY NO. DESCRIPTION QUANTITY
1 SUMP TANKS 2
2 AIR INLET 1
3 AIR INLET VALVE 1
4 VACUUM UNIT 1
FLUID/AIR
AIR
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