Technical Guide
DAN-LIQ-TG-44-rev0813
November 2013
32
Model 710P760 Combination Solenoid On-Off and Back Pressure Control in Parallel
Both pilots have been illustrated as separate functions on a basic valve (Models 710 and 760). Now the pilots are combined on a
single valve.
When two (2) pilots are in parallel, only one pilot must be open for the main valve to open, but both pilots must close to
assure the main valve closes.
The advantage of multiple controls is to incorporate various functions on a single valve.
= Inlet Pressure
= Outlet Pressure
= Pilot Spring Force
CLOSED POSITION - Both pilots are closed. The solenoid de-energized. Inlet pressure (P1) is less
than the back pressure pilot setting. 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 5-4
X
Z
Y
Needle Valve/Strainer
(Closing/Sensitivity Control)
Sense Line
Solenoid Pilot (N.C.)
P3
P2
P1
Back Pressure Pilot (N.C.)
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