Emerson Daniel 700 Series - Section 5 - MULTIPLE PILOTS (SERIES and PARALLEL); Model 710 S750 Combination Solenoid On-Off and Pressure Reducing Control in Series

Technical Guide
DAN-LIQ-TG-44-rev0813
November 2013
30
Section 5
MULTIPLE PILOTS (SERIES AND PARALLEL)
Model 710S750 Combination Solenoid On-Off and Pressure Reducing Control in Series
Both pilots have been illustrated as separate functions on a basic valve (Models 710 and 750). Now the pilots are combined on a
single valve. This is the starting point for multiple control functions on one basic valve.
When pilots are in a series, all pilots must be open for the main valve to open, but should one pilot close, the main valve
will also close.
The advantage of multiple controls is to incorporate various functions on a single valve.
= Inlet Pressure
= Outlet Pressure
= Spring Force
CLOSED POSITION - The solenoid pilot is closed (de-energized). Y-port (3) 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 5-1
X
Z
Y
X
Z
Y
X
Z
Y
P3
P2
P1
Needle Valve/Strainer
(Closing/Sensitivity Control)
Sense Line
Solenoid Pilot (N.C.)
Pressure Reducing
Pilot (N.O.)