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DEC 2012 DANIEL MODEL 788DVC DIGITAL CONTROL VALVES
TM
DISASSEMBLY AND REASSEMBLY5-2
5.2 Cylinder Disassembly
Refer to Figure 5-2.
PERSONAL INJURY AND/OR EQUIPMENT DAMAGE
Caution is required when performing any disassembly procedure as the Cylinder head is
bolted to a spring loaded cylinder assembly. Service should only be performed by trained
and qualified service personnel.
Failure to comply with recommended could result in serious injury and/or damage to the
equipment.
1. Position the cylinder assembly in an arbor press with the cylinder head (5) down. Valves
smaller than 6" may not require a press. Larger units may require the use of a spindle or
arbor press to facilitate removal of the piston assembly, in which case, the arbor should be
resting against the cylinder head.
2. Place a metal sleeve over the piston nose to protect the sense line during removal. This can
be fabricated from a pipe section and should have an internal diameter large enough to
encircle the piston nose. The length must be sufficient to accommodate complete spring
compression with allowing the sense line to strike the press plunger.
3. Using EXTREME CAUTION depress the piston against the spring until the rectangular
ports are cleared. Block the piston in the open position, fully compressed, by inserting a
suitable wedge through the port opening. Any wood, nylon or non-marring dowel or handle
that will safely guarantee piston position can be used for this operation. It is recommended
that a brass or other soft metal bar be used for this operation.
4. Remove the retaining ring, sealing ring and O-ring.
5. Using EXTREME CAUTION depress the piston against the spring and remove the piston
blocks. CAREFULLY remove the piston from the cylinder body while maintaining pressure
on the valve spring.