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DEC 2012 DANIEL MODEL 788DVC DIGITAL CONTROL VALVES
TM
THEORY OF OPERATION2-2
CLOSED POSITION -
The normally closed solenoid is closed. The normally open solenoid is open. Y-port (P3) to Z-port
(P2) is closed. X-port (P1) and Y-port (P3) pressures are balanced. The main valve spring being the
differential force, closes the piston and keeps it seated.
Figure 2-1. Closed Position