G 120 II V
Page 22 1st Edition, Rev. 0 Chg. 2
3.1.8.2 General Instructions for Changing the Valves
• Always replace valves as a complete set.
• Carefully clean dirty valves. Never use a sharp tool for this purpose. Soak the valves in Varsol and
clean with a soft brush.
• Check the individual components for excessive wear. If the valve seat or valve discs are dented,
replace the valves.
• Check the valve space in the valve heads for dirt, and clean if necessary.
• Use only satisfactory gaskets and O-rings during reassembly.
• Observe the correct sequence when reassembling.
• After finishing all maintenance work on the valves, turn the compressor manually using the flywheel
and check whether all items have been correctly installed.
• 30 minutes after restarting the compressor, stop the unit, let it cool down to ambient temperature, and
retighten valve studs and cap nuts. Otherwise the gasket set may cause a leak.
• Remove and check the valves every 1,000 operating hours.
• Replace the valves every 2,000 operating hours to avoid fatigue failure.
Figure 3-10 IK120II C & G, 1st Stage Valve
TOP VIEW
Intake Side
Pressure Side
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