| 摘要 |
<p>A switching valve device that, even if a bi-directional pump is used, can allow a high flow rate without requiring an additional pressure source and that do not constrain the design of a fluid pressure cylinder. The switching valve device has a reciprocatable, moving valve body; a first flow path that, when the moving valve body is at either of the movement ends, communicates a port PT2 and a port PT1 by using, as a part of the flow path, a part of a movement path of the moving valve body; a second flow path that, when the moving valve body is at the other movement end, communicates the port PT2 and a port PT3 by using, as a part of the flow path, an inner flow path provided in the moving valve body; and a spring for urging the moving valve body toward the either of the movement ends. A first check valve is provided in the moving valve body, and the first check valve allows only a flow from the port PT3 to the port PT2 in the inner flow path. When fluid pressure is applied to the port PT3, the fluid pressure causes the moving valve body to move to the other movement end to close the first flow path, and after the first flow path is closed, the first check valve is opened to open the second flow path.</p> |
