The primary function of a pressure compensator in a variable displacement piston pump used in an excavator is to maintain a consistent system pressure, regardless of the flow demand from the excavator's hydraulic actuators (cylinders and motors). A variable displacement piston pump is designed to adjust the amount of hydraulic fluid it delivers per revolution. This adjustment is controlled by the pressure compensator. The pressure compensator is essentially a valve that senses the hydraulic system's pressure. When the pressure reaches a pre-set level (the compensator setting), the compensator beg....
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