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DANIEL MODEL 788DVC DIGITAL CONTROL VALVES DEC 2012
TM
TROUBLESHOOTING 6-1
6.0 TROUBLESHOOTING
The most frequent problem encountered with any control valve is the accumulation of sediment,
rouge, scale and other foreign material in the pilot or its supply system. It is, therefore, good practice
to periodically remove the pilot from the valve and inspect it for accumulation of these materials.
The strainer and needle valve in the pilot supply line should also be flushed periodically to avoid
erratic control and slow response typical to obstructed flow. If sub-standard conditions persist after
thoroughly cleaning the system, examine the pilot for swollen o-rings.
Periodic examination of all seal and o-rings for nicks, cuts and wear is recommended. Reference
Section 5, Cylinder Disassembly/Reassembly.