Mathias NY, not exactly correct. In a closed center system, the pump is ALWAYS pressurizing the fluid to a high PSI, and maintains that by using a high-pressure bypass valve. So you are still pumping the fluid, whether it's an open or closed center system. Since the closed center system is running at MAX pressure when not being used, it is the one that generates more heat and is less efficient. An open center system always circulates the fluid, but when the valves are centered it is at a very low pressure, and therefore doesn't generate as much heat or use as much fuel
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