| 摘要 |
PROBLEM TO BE SOLVED: To provide a normally open type electromagnetic valve capable of reducing spring load when starting energization and increasing the spring load in an operational area with large magnetic attraction force while avoiding reduction in a magnetic pole surface.SOLUTION: Two springs 36, 38 are arranged in series and a spring receiving member 34 is arranged between the two springs 36, 38. In an operational area where magnetic attraction force is low and a position of a valve body 20 is closer to the fully opened position side than an intermediate position, the spring receiving member 34 is not abutted on a sleeve 12 or an armature 22 and both deflections of the two springs 36, 38 are changed, so that a synthetic spring constant is reduced. In an operational area where the magnetic attraction force is large and the position of the valve body 20 is closer to the fully closed position side than the intermediate position, the spring receiving member 34 is abutted on the sleeve 12 and the deflection of one spring 36 is not changed, so that the spring constant is increased. |
