Closed center hydraulic systems
Closed center systems have a variable-displacement piston pump that supplies oil when needed.
This pump only pumps amount of oil that covers valves internal leakages and keeps pressure about 25bar. Often this system in called as a LS (load-sensing) system. When the driver operates the valve, then it gives an LS signal to the pump and the pump gives bigger flow to the implement. This is a little more efficient system, because it doesen't need to consume any power to rotate oli when it is not needed.
This pump only pumps amount of oil that covers valves internal leakages and keeps pressure about 25bar. Often this system in called as a LS (load-sensing) system. When the driver operates the valve, then it gives an LS signal to the pump and the pump gives bigger flow to the implement. This is a little more efficient system, because it doesen't need to consume any power to rotate oli when it is not needed.