| 摘要 |
PURPOSE:To attain a state of operation in a solenoid valve detectable without giving any hindrance to on-off operations of the valve, by installing both of a check voltage generating circuit, which energizes a solenoid coil of the solenoid valve with a slight current, and a level discrimination detecting circuit which discriminates the detection of induced electromotive force or the like in the solenoid coil. CONSTITUTION:Pushing up an operating button 58 of an operating device 61, when a movable iron core 40 is pushed upward via an operating shaft 57, a valve body 42 is opened and held by magnetic flux of a permanent magnet 43. Next, when a driving coil 52 is energized in a direction toward magnetomotive force which decreases the magnetic flux of the permanent magnet 43, the movable iron core 40 is separated off by a spring 45 and thereby the valve body 42 is closed. When signal voltage is impressed on a check coil 50 connected to the driving coil 52 through an intermediate tap 48 from a check voltage generating circuit 62, induced electromotive force is produced in the driving coil 52 so that a state of valve opening or closing is discriminated by a level discrimination detecting circuit 64 according to its size and informed with a buzzer 67 via a display informing circuit 66. |
