MVT26
October 2003
Section 3
Page 23
3.1.5
Compressor Valves and Valve Heads
3.1.5.1
Functional Description
The valve heads of the individual stages form the upper part of the cylinders. The inlet and pressure
valves are fitted inside the valve heads.
When the piston moves downwards, the resultant vacuum in the piston cylinder opens the inlet valve.
When the piston moves upwards, the inlet valve is closed and the pressure valve opened by the pressure
created in the compression process. See Figure 3.1-10.
3.1.5.2
Initial Operational Check of the Valves
After roughly half an hour of operation, the valves should be checked. The outlet piping should be hot if
the valves are operating properly. Note that the inlet line to the valve heads should be warm to the touch.
3.1.5.3
General Instructions for Changing the Valves
Please observe the following instructions for valve maintenance:
1. Always replace valves as a complete set.
2. Carefully clean dirty valves. Never use a sharp tool for this purpose. Soak the valves in Varsol and
clean with a soft brush.
3. Check the individual components for excessive wear. If the valve seat or valve discs are dented,
replace the valves.
4. Check the valve space in the valve heads for dirt, and clean if necessary.
5. Use only satisfactory gaskets and O-rings during reassembly.
Figure 3.1-10
Valve Function
WARNING
Do not touch the outlet piping with bare hands, use a thermometer.
Intake
Pressure