ARM REGENERATING DEVICE OF EXCAVATOR CONTROL VALVE WITH AMR REGENERATING SPOOL

摘要

PURPOSE: An arm regenerating device of an excavator control valve with an arm regenerating spool is provided to install an additional arm spool to enlarge the amount of regenerated oil, to make the movement of an arm faster than before and reduces additional processing cost. CONSTITUTION: The arm regenerating device of an excavator control valve with an arm regenerating spool contains: an arm spool(9) and an arm regenerating spool(17) connected to a control valve housing(41) through an oil passage; a pilot port(39) connected to each end of spools and moving the spools right and left to change the direction of flowing oil by pilot pressure, connected to a selector spool and a spring connecting or cutting off the connection between inner oil passages if necessary, a pilot room(35) connected to the oil passage and a sub spool(36) pushing the left end of the arm regenerating spool; an arm regenerating check valve(10) controlling the oil passage passing the arm regenerating spool and the arm spool.