Patent ID: 7739940

Claim:
A directional control valve device with a first port, a second port and a third port, for selecting either a connection between the second port and the first port or a connection between the second port and the third port, the directional control valve device comprising: a moving valve element that can move in a reciprocating manner; a first passage for making a connection between the second port and the first port by using a part of a movement path of the moving valve element as a part of the passage when the moving valve element is in a position of a first movable end; a second passage for making a connection between the second port and the third port by using an internal passage of the moving valve element as a part of the passage when the moving valve element is in a second movable end; a spring for pressing the moving valve element toward the first movable end; a solenoid valve having an inlet side thereof formed as the fourth port and an outlet side thereof connected to the third port and provided integrally for shutting off hydraulic fluid supplied externally; and a second check valve for allowing hydraulic fluid inside the second passage to pass to the fourth port, wherein the moving valve element is provided with a first check valve for permitting a flow in the internal passage only in the direction from the third port to the second port, and when a fluid pressure is applied to the third port, the fluid pressure presses the moving valve element to move to the second movable end so that the first passage is closed, and after the first passage is closed the first check valve is opened so that the second passage is opened.