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Maintenance
29
Air valves
3.5.1.
Air valve unit inspection and replacement
WARNING
- AIR SUPPLY TO THE PUMP MUST BE ISOLATED BEFORE ANY MAINTENANCE IS
CARRIED OUT.
TYPICAL AIR VALVE SHOWN, VARIATIONS WILL APPLY DEPENDING ON PUMP
SPECIFICATION BUT DESIGN IS FUNDAMENTALLY THE SAME.
Fig 44
1. Loosen the 4 fixing bolts holding the valve unit
to the air assembly and main dome.
Fig 45
2. Remove the air valve unit.
Fig 46
3. Dismantle the valve unit by removing the cover
plate.
4. Replace air valve if internal spool does not
move freely when manual override buttons are
pressed or there are signs of media within.
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