MNL-0408
June 11, 2009 Page 19
3.1.8 Cooling
3.1.8.1 General
The cylinders of the compressor, the intermediate coolers and the after cooler are air cooled. For this
purpose the compressor is equipped with a fanwheel which draws the cooling air through the unit. The
fanwheel is driven by the drive motor V-belt and is also used as the compressor flywheel.
3.1.9 Valves and Heads
3.1.9.1 Functional Description
The valve heads of the individual stages form the top part of the cylinders. (See Figure 3-10). The
intake and pressure valves are fitted inside the valve heads. Note that the valves are operated by the
flow of the medium. On the intake stroke, the intake valves open and the medium flows into the cylin-
ders. At the start of the pressure stroke the intake valve closes and the medium opens the pressure valve.
Figure 3-10 Valve Operation
Figure 3-11 IK120II Plate Valve
Intake Discharge
TOP VIEW
Intake Side
Pressure Side
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