Eagle RECIPROCATING, Owner'S Manual

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14
Two-Stage Compressors
During the downstroke of the piston of a two-stage compressor, air is forced into the first stage cylinder by atmospheric
pressure through an inlet filter and an intake valve in the head of the compressor. When the piston reaches the bottom
of the stroke, the intake valve closes. During the upstroke of the piston, the air is compressed, the discharge valve opens
and the compressed air is delivered to the second stage through finned intercooler tubes where the heat created by the
compressor is allowed to dissipate.
The cooled compressed air is then forced into the second-stage cylinder via an intake valve. The second-stage cylinder
fills with compressed air during the downstroke of the second-stage piston. During the upstroke of that piston, the air
is compressed and released through a discharge valve to the air receiver tank. In one revolution of the crankshaft the
complete two-stage cycle is completed.
The Lubrication System
All Eagle Reciprocating Compressors are splash lubricated. With each rotation of the compressor, a dipper attached to the
bottom of the connecting rod dips into an oil bath at the bottom of the crankcase. This dipper splashes oil throughout the
interior of the crankcase, lubricating all moving parts.