Copyright
Goodheart-Willcox
Co.,
Inc.
Chapter
18
Load-Sensing
Pressure-Compensating
(LSPC)
Hydraulic
Systems
425
Figure 18-7. The initial secondary shuttle valve in a signal network sequence chooses the higher working pressure between its DCV and the working
pressure it receives from the downstream DCV(s). It sends the higher signal pressure to the unloading valve, which maintains system pressure at
1800 psi (124 bar).
High-pressure
relief (3000 psi) 500 psi to extend 1000 psi to extend 1500 psi to retract
DCV 1 DCV 2 DCV 3
Unloading
valve (300 psi)
Primary shuttle
valve
Primary shuttle
valve
Primary shuttle
valve
Secondary
shuttle valve
Secondary
shuttle valve