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DEC 2012 DANIEL MODEL 788DVC DIGITAL CONTROL VALVES
TM
DISASSEMBLY AND REASSEMBLY5-4
5.3 Cylinder Reassembly
Refer to Figure 5-2.
1. Inspect all O-rings for wear and damage and replace as required.
2. If removed, attach the cylinder head to the main cylinder body.
3. Insert the valve spring into the cylinder housing.
4. Inspect and position the piston into the cylinder housing.
5. Insert the fabricated sleeve over the valve piston and spring assembly. Once fully
compressed, block the spring following the procedure used in step 3 of the Disassembly
procedure.
6. Inspect and reposition the seat O-ring.
7. Replace seating and retaining ring. Once the entire retaining ring is in its’ groove, position
a punch or screwdriver over the end of the ring and tap sharply. This will seat the ring.
8. Again, using CAUTION, apply pressure to the valve piston and remove the block. Carefully
relieve the tension on the spring until it is properly resting against the seat ring.
9. Reinstall the cylinder assembly in the valve body being careful to properly seat O-rings and
secure in place using lock nuts.
Figure 5-2. Cylinder Assembly Removal