Copyright
Goodheart-Willcox
Co.,
Inc.
Chapter
18
Load-Sensing
Pressure-Compensating
(LSPC)
Hydraulic
Systems
423
Figure 18-6. The primary shuttle valves in this schematic determine if the cylinder it monitors is extending or retracting and send the higher signal pressure
to a secondary shuttle valve. The secondary shuttle valve chooses which DCV is operating at the higher pressure and sends that signal pressure to another
secondary shuttle valve or to the unloading valve, depending on the design of the signal network.
High-pressure
relief (3000 psi)
Unloading
valve (300 psi)
Primary shuttle
valve
Primary shuttle
valve
Primary shuttle
valve
Secondary
shuttle valve
Secondary
shuttle valve