| 摘要 |
PURPOSE:To make it possible to detect a false switching condition of a solenoid valve caused by a spool which has not moved to a predetermined position, by operationally associating a sensor for detecting the position of the spool with an indicator arranged visiually from the outside. CONSTITUTION:A coil 6 is energized by closing a switch 10, and a steel piece 5, a rod 11a of a sensor 11 and an iron core 11b are moved together with the movement of a spool 2 so that electromotive force is induced due to the movement of the iron core 11 in an induction coil 11c of the sensor 11. Electrical current generated by the induced electromotive force is indicated by an amperemeter which is used as an indicator arranged visually from the outside. |
