EP5 Electro Pneumatic Digital Positioner FCD PMENIM0006-00-A5 12/18
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12. Maintenance
Pilot valve
To remove the pilot valve for cleaning or inspection, remove the screw 1 and carefully lift out
the complete assembly 2. Gently remove the spool 3 from the block and clean the parts, using
methylate cleaner or similar. Blow the parts dry with compressed air. Install the spool into the pilot
valve housing, place it on a flat surface, then lift it carefully in one end. Before reaching 20 deg
angle the spool should slide by itself.
Should the parts show signs of wear, a new assembly is recommended. Mixing spool valves and
valve bodies may result in very high bleed rates and poor performance. Check the O-rings, then
secure and install the pilot valve assembly into positioner unit, press it towards the positioner
housing wall and secure it with screw 1. Make sure that the leaf spring 4 on the balance arm 5
is properly fitted in the groove on the spool 6. Check again to insure smooth operation of the
assembly.
To maintain original factory performance specifications, use only spool valve assemblies supplied
by PMV.
3
2
1
6
5
4
<20 Deg
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