Abstract text

[PROBLEM] To provide a directional control valve assembly, in which a check valve for controlling a flow rate of pressure oil to be guided to a directional control valve as a main valve and a control means for limiting an opening degree of the check valve by a pressure are integrated with the directional control valve and therefore, a flow hardly occurs in the pressure oil that produces the pressure.

[SOLUTION] A control means has a pressure chamber 24 for causing a pressure to act on a valve element 21 of a check valve 20, an oil chamber 39 around the valve element 21, a slot 40 formed in the valve element 21 and interconnecting the oil chamber 39 and the pressure chamber 24 with each other and, a control valve 25 connected directly to a divergence portion 17, which is interconnected with a slide hole in a directional control valve, and the oil chamber 39 and capable of permitting or cutting off communication between the divergence portion 17 and the oil chamber 39 and changing an opening degree of the communication, an intra-valve-element passage 42, a control slot 41 formed in an outer peripheral wall of the valve element 21 and communicating the intra-valve-element passage 42 and the oil chamber 39 with each other, and a spring-return auxiliary check valve 43 for allowing pressure oil to flow from a supply passage 15 into the intra-valve-element passage 42.