DIRECTIONAL CONTROL VALVE DEVICE AND DIRECTIONAL CONTROL VALVE DEVICE BLOCK HAVING DIRECTIONAL CONTROL VALVE DEVICES

摘要

[PROBLEMS] A directional control valve device in which a check valve and control means are integral with a directional control valve, the check valve controlling the flow of pressurized oil introduced into a directional control valve as a main valve, the control means limiting the opening of the check valve by pressure, wherein the pressurized oil that generates such pressure is less likely to become a flow. [MEANS FOR SOLVING THE PROBLEMS] The control means has a pressure chamber (24) for causing pressure to act on a valve body (21) of the check valve (20); an oil chamber (39) around the valve body (21); a groove (40) formed in the valve body (21) and interconnecting the oil chamber (39) and the pressure chamber (24); a control valve (25) directly connected to both a branch part (17) and the oil chamber (39) that continue to the sliding hole of the directional control valve, capable of permitting and interrupting the connection between the branch part (17) and the oil chamber (39), and capable of varying the opening of the connection; a passage (42) inside the valve body; a control groove (41) for interconnecting the passage (42) inside the valve body and the oil chamber (39) and formed in the outer peripheral surface of the valve body (21); and a spring return type auxiliary check valve (43) for permitting pressurized oil to flow from a supply passage (15) into the in-valve body passage (42).