Section 2
DESCRIPTION
6
With a Sullair machine, there will be no internal
maintenance or inspection of the vacuum unit per-
mitted in accordance with the terms of warranty.
Fluid is injected into the vacuum unit and mixes
directly with the gas as the internal rotors turn,
drawing a vacuum. The fluid flow has three main
functions:
1. As coolant, it controls the rise of air tem-
perature normally associated with the heat
of compression.
2. Seals the leakage paths between the rotors
and the stator and also between the rotors'
meshes.
3. Acts as a lubricating film between the rotors
allowing one rotor to directly drive the other,
which is an idler.
After the gas/fluid mixture has been discharged
from the vacuum unit, the fluid is separated from
the gas. At this time, the gas is discharged from the
separator tank and the fluid is cooled in preparation
for reinjection.
2.4 COOLING AND LUBRICATION SYSTEM, FUNC-
TIONAL DESCRIPTION
Refer to Figure 2-2. The Cooling and Lubrication
System consists of a fan, fan motor, radiator-
type cooler, fluid filter, unit-driven fluid pump,
fluid regulating valves, cooler thermal bypass
valve along with interconnecting piping, tubing
and hoses.
A unit-driven fluid pump causes fluid flow by draw-
ing the fluid from the sump, through a fluid pump
suction strainer, and pressurized to 25-30 psig to
the system.
The fluid is delivered from the receiver/sump to the
cooler thermal bypass valve. The thermal bypass
valve has a nominal temperature of 175°F (79°C).
Figure 2-1B Sullair Rotary Screw Vacuum System - Water-cooled
KEY NO. DESCRIPTION QUANTITY KEY NO. DESCRIPTION QUANTITY
1 AIR FILTER 1 7 SUMP TANK 2
2 AIR INLET 1 8 WATER-COOLER 1
3 FLUID FILTER 1 9 CONTROL BOX 1
4 VACUUM UNIT 1 10 INSTRUMENT PANEL 1
5 SULLICON CONTROL 1 11 SIGHT GLASSES 2 / SUMP TANK
6 MOTOR 1 12 FLUID FILL PORT 1 / SUMP TANK
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