| 摘要 |
PURPOSE:To obtain the captioned valve which certainly operates without being influenced by the leaking magnetic flux due to an electromagnetic coil and is stable, having a high reliability, by intercepting excitation of the electromagnetic coil by means of a lead switch on the opposite side to the excited coil side. CONSTITUTION:When control signals 22a are input, and the positive signal is input into a Cb terminal, and the negative signal is input into a Db terminal, an electromagnetic coil 14a is excited by the positive signal input into the Cb terminal through a diodes 23b and a Bb terminal. Then, the negative Db terminal is brought into conduction through the contact between an Ab terminal and a lead switch 15b. During this time, an iron core 11a is pulled to a core 13a side by an electromagnetic force, and a push pin 6a is pushed, and then a spool 3 and a push pin 6b are shifted to the right. Therefore, a switch rod 10b and a permanent magnet 12b are shifted rightward, and the lead switch 15b is turned OFF when the spool 3 is shifted by a prescribed length, and the control signals 22a are intercepted, and excitation of the electromagnetic coil 14a is released. |
