DIRECTIONAL CONTROL VALVE HAVING REGENERATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a directional control valve having a regeneration circuit capable of achieving a regeneration function by operation of a spool in one direction, and preventing backflow of pressure oil by operation of the spool in the opposite direction even with a spool type comprising a flow controlling notch opened in a load port. SOLUTION: An oil passage 52 directly opened in a load port Ba is provided on a spool 22, and an inward flow check valve 54 having a valve element 60 to control opening/closing to the oil passage 52 and an oil passage 51 is provided in the spool 22. An oil passage 53 opened in a tank port T1 when the spool 22 is operated left in an illustration is provided, a restrictor 70 to communicate the oil passage 52 with a spring chamber 65 inside the valve element 60 and a restrictor 71 to communicate the spring chamber 65 with the oil passage 53 are provided on the valve element 60 of the check value 54, and an opening area of the restrictor 70 is set to be smaller than an opening area of the restrictor 71.