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DEC 2012 DANIEL MODEL 788DVC DIGITAL CONTROL VALVES
TM
THEORY OF OPERATION2-4
OPEN POSITION - (no control) -
The normally closed solenoid is open. The normally open solenoid is closed. Y-port (P3) is open to
Z-port (P2). X-port (P1) is closed off by the normally open solenoid. The pressure on the bottom of
the piston (P1) is greater than the pressure at (P3) plus the spring force; (P1 minus P2) is equal to
or greater than the spring force. Therefore, (P1) pressure pushes the piston open. No flow control
is required.
Figure 2-3. Open Position (no control)