| 摘要 |
PURPOSE:To make the attractive force of a DC on-off solenoid constant regardless of the stroke of a spool, by providing a first spring between the spool and the solenoid, which is energized by a pulse, and by causing a second spring to act to the solenoid to oppose secondary-side pressure. CONSTITUTION:A DC on-off solenoid 9 is slidably supported at one side of a spool 8. The spool is secured on one end of a plunger 10 combined with the solenoid 9. The plunger is provided with a flange 11 at the other end. A first spring 13 is interposed between the spool 8 and the solenoid 9. A second spring 14 is interposed between a valve casing 7 and a stopper 12 extending from the solenoid. The solenoid 9 is energized and deenergized by a pulse signal from a pulse modulator to vibrate the spool 8. The pressure in a secondary passage 19 acts to a pressure chamber 17, too, to move the spool 8 to reduce the cross sectional area of the passage so that the secondary pressure is controlled. |
