不同类型电磁阀的工作原理
追朔电磁阀的发展史，到目前为止，国内外的电磁阀从原理上分为三大类(即:直动式、分步童先导式)，而丛阀瓣结构和材料
上的不同与原理上的区别又分为六个分支小类(直动膜片结构，分步重片结构，先导膜式结构，直动活寒结构，分步直动活塞
结构、先导活塞结构)。直动式电磁阀:
原理:通电时，电磁线圈产生电磁力把关闭件从阀座上提起，阀门打开;断电时，电磁力消失，弹簧把关闭件压在阀座上，阀门关闭。
特点:在真空、负压、零压时能正常工作，但通径一般不超过25mm。分布直动式电磁阀:
原理:它是一种直动和先导式相结合的原理，当入口与出口没有压差时，通电后，电磁力直接把先导小阀和主阀关闭件依次
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