type oil pump circulates oil through passages in the
crankshaft and connection rod to lubricate the journal
bearings and wrist pins (see figure 1.3B). Sturdy iron
crossheads transmit reciprocating motion to the piston.
Corken’s automatically reversible oil pump design
allows the machine to function smoothly in either
direction of rotation.
Corken compressors use iron pistons locked to the piston
rod. The standard piston ring material is a glass-filled
PTFE polymer specially formulated for non-lubricated
services. Piston ring expanders are placed behind the
rings to ensure that the piston rings seal tightly against
the cylinder wall.
Figure 1.3B: Pressure lubrication system (not available on Model 91).
Piston rod packing is used to seal the gas in the
compression chamber and prevent crankcase oil from
entering the compressor cylinder. The packing consists
of several PTFE V-rings sandwiched between a male and
female packing ring and held in place by a spring (see
figure 1.3C).
The typical Corken compressor valve consists of a seat,
bumper, one or more spring/s and one or more valve/s
discs or plates as shown in figure 1.3D. Special heat-
treated alloys are utilized to prolong life of the valve in
punishing non-lubricated services. The valve opens
whenever the pressure on the seat side exceeds the
pressure on the spring side.
Gasket
Adjusting
screw
Relief ball spring
Relief ball
Suction valve
seat
Valve plate
Spacers
Washer
Spacers
Washer
Valve spring
Suction valve
post
Suction valve
bumper
Valve gasket
Gasket
Bolt
Discharge valve
bumper
Valve spring
Valve plate
Discharge valve
seat
Valve gasket
Suction Valve
Spec 3
Discharge Valve
All Specs
Figure 1.3C: Compressor sealing system
Figure 1.3D: Compressor sealing system
7
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