Closed center hydraulic systems rely on closed center circuits, or systems of interconnected components that move fluid, to provide pressure to the control valves, which partially or fully close or open, based on sensors that determine the level and rate of flow. The pump moves only minimal hydraulic fluid through the closed circuits until a valve is actuated by an operator. This allows the valve's spool to operate without an open return path to the hydraulic system's fluid reservoir. This configuration allows multiple valves to connect to different operations while sharing equal system pressure.
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