| 摘要 |
PURPOSE:To reduce the volume of a motor by forming the diameter of the edge shaft of a valve spool smaller than that of a connecting shaft. CONSTITUTION:As for a flow-rate control valve 11, the valve spool 27 for opening and closing a fluid passage which is driven by a motor 16 through a screw mechanism 18 and advances and retreats in a case body 12 is axially supported onto the case body 12 by a connecting shaft 29b on the screw mechanism 18 side and an edge shaft 29c on a fluid inflow port side. In this case, the max. pulling force and the max. compression force which act onto the connecting shaft 29b are made nearly equal by forming the diameter of the edge shaft 29c smaller than the diameter of the connecting shaft 29c. Therefore, the power for advancing and retreating the valve spool 27 can be reduced markedly. |
