| 摘要 |
PURPOSE:To enable to hold a valve body at the predetermined position of opening or closing by a method wherein a coil, for reciprocating a plunger by receiving a driving signal from a driving circuit, and another coil, for holding a bypass valve at the closing position thereof, are provided. CONSTITUTION:When a responding body 39 is arrived at the predetermined position thereof by the pressure of working fluid sent under pressure by the operation of an electromagnetic pump 33, it is detected by a lead switch 43 and a first driving signal being supplied at that time from the driving circuit 90 to the first coil 51a is stopped. However, the second driving signal is continued to be supplied from the driving circuit 90 to the second coil 51b, therefore, a bypass valve 70 is held at the closing position thereof as it is. Accordingly, the responding body 39 is held at the position as it is located. |
