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DANIEL MODEL 788DVC DIGITAL CONTROL VALVES DEC 2012
TM
THEORY OF OPERATION 2-3
OPEN - CONTROL POSITION -
The normally closed solenoid is closed. The normally open solenoid is closed. Y-Port (P3) to Z-port
(P2) is closed. X-port (P1) to Y-port (P3) is closed. The product cannot flow to or from the top of
the piston. The piston is hydraulically locked in position until the electronic preset commands the
valve to open or close as required to maintain the desired high flow rate, or low flow rate.
Figure 2-2. Open - Control Position