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LUBRICATION, COOLING AND SEALING (
Figure 4-3, page 35) - Oil is forced by differential pressure
from the oil reservoir through the oil cooler, thermostatic mixing valve/oil filter combination, distribution
manifold, and enters the compressors and inter-stage manifold. A portion of the oil is directed to internal
passages, on both 1st and 2nd stage airends, to lubricate the bearings and shaft oil seals. The balance
of the oil is metered by solenoid valves and orifices and injected into the 1st stage compressor rotors and
inter-stage manifold to remove the heat of compression, seal internal clearances and lubricate the rotors.
