Invention Grant
US07739940B2 Directional control valve device and fluid pressure cylinder device 失效
方向控制阀装置和流体压力缸装置

Directional control valve device and fluid pressure cylinder device
Abstract:
In a directional control valve device, a first passage connects a second port with a first port by using a part of a movement path of a moving valve element when the moving valve element is in a position of a first end. A second passage connects the second port with the third port by using an internal passage of the moving valve element when the moving valve element is in a second end. 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. When a fluid pressure is applied to the third port, the fluid pressure presses the moving valve element toward the second end so that the first passage is closed, and the first check valve is opened to open the second passage.
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