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In this important video we can learn about the internal structure of the pressure and flow compensators (cut-off and margin) of variable volumetric displacement pumps. The structural and logical relationship is shown, as well as previously unpublished structural details. In addition, each detail of the most common valve package that controls variable pumps is explained from the beginning and in a didactic way. The objective of this package is to deliver a constant flow rate regardless of the loads and the variation in the rpm of the motor that drives the pump.