In a traditional LSPC variable-displacement pumps equipped with two spools, what is the name of the small spool that has a hydraulic port for connecting to the hydraulic line? In a traditional LSPC variable-displacement pumps equipped with two spools, what is the name of the small spool that has a hydraulic port for connecting to the hydraulic line? Pressure compensating spool Torque limiting spool Flow control spool Negative flow control spool