| 摘要 |
<P>PROBLEM TO BE SOLVED: To totally suppress cost required for a control valve switching a plurality of fluid channels through which operation fluid flows. <P>SOLUTION: A control valve in one embodiment is provided with: a shared body 104 that contains proportional valves 34 and 37; a shared motor unit 102 that electrically adjusts the opening of the proportional valves; a valve actuator 134; a driven valve element 132; an actuation-mode switching mechanism; and a back-pressure cancellation structure. The driven valve element integrally includes a first valve element 141 that opens and closes the proportional valve 34 and a second valve element 142 that opens and closes the proportional valve 37. The driven valve element is coupled to the valve actuator 134 so as to be able to move together therewith. When the openings of the proportional valves are being controlled, the actuation-mode switching mechanism couples the valve actuator 134 to the driven valve element 132, and when the opening of one of the proportional valves 34 or 37 is being controlled, the actuation-mode switching mechanism can keep the other fully open. The back-pressure cancellation structure simultaneously cancels the effects of fluid pressure acting on both the first valve element 141 and the second valve element 142. <P>COPYRIGHT: (C)2012,JPO&INPIT |
