Technical Guide
DAN-LIQ-TG-44-rev0813
November 2013
X
Z
Y
Needle Valve/Strainer
(Closing/Sensitivity Control)
Solenoid Pilot (N.C.)
Solenoid Operated On-Off Valves - Model 710 (N.C.) and Model 711 (N.O)
N.C. = Normally closed, energize to open
N.O. = Normally open, energize to close
A solenoid valve is either open or closed. It does not perform any control functions unless the other controls have been
incorporated. It is an on-off block valve, and is inherently a check valve.
As a line block valve, it is used for remote on-off control to start or stop a flowing stream such as:
1. Batching operation by preset
2. Tank filling high level control
3. Line block valve
16
= Inlet Pressure
= Outlet Pressure
CLOSED POSITION - The solenoid pilot is closed (N.C. illustrated). 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. The needle valve controls the speed of
closure.
MODEL 710 - (N.C.) ILLUSTRATED - Opens when energized.
MODEL 711 - (N.C.) - Closes when energized.
P1
P3
P2
Figure 4-4
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