MNL-0295
August 27, 2009 Page 21
3.4.2 Initial Operational Check
After maintenance work on the valves, the valves should be checked for proper operation. Note that the
intake line to the valve heads is warm and the outlet piping should be hot. This indicates the valves are
operating correctly.
3.4.3 Changing the Valves
• Always replace the valves as a complete set.
• Observe the correct sequence when reassembling.
• Check individual components for excessive wear. If the valve seat and valve disks are dented, replace
the valves.
• Valve head screws must be tightened with a torque wrench.
• Check the valve space in the valve head for dirt and clean if necessary.
• Thirty minutes after restarting the compressor unit, stop the unit, let it cool to ambient temperature
and retighten the valve studs and cap nuts. Otherwise valves could work loose due to the setting of the
gaskets.
• After finishing all maintenance work on the valves, turn the compressor by hand using the flywheel
and check that all items have been correctly installed.
• Remove and check the valves every 1,000 operating hours.
• Replace the valves every 2,000 operating hours to avoid fatigue failure
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