| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce necessary magnetic attractive force while suppressing vibration of a valving element.SOLUTION: In a high lift region, a fluid force applied to a valving element 20 is remarkably reduced and a variation amount of a fluid force versus a variation amount of lift of the valving element 20 is also reduced. Therefore, it is found that in the high lift region, the valving element 20 is largely and rapidly displaced by a slight variation of the magnetic attractive force applied to the valving element 20 and vibration of the valving element 20 is generated by the displacement to be a trigger. Consequently, a passage area between the valving element 20 located on a position most separated from a valve seat 181 and the valve seat 181 is set to a passage area of an orifice 180 or less. Thereby, only a lift region where a variation amount of a fluid force versus a lift variation amount is large, out of lift regions of the valving element 20, is used, so that a large displacement of the valving element 20 due to a slight variation of the magnetic attractive force can be avoided and vibration of the valving element 20 can be suppressed.</p> |
