蒸汽电磁阀有怎样的蒸汽特点

      日常生活中我们接触到的蒸汽常分为两种：1、锅炉蒸汽-饱和蒸汽 2、热电厂出来的蒸汽-过热蒸汽。

      蒸汽电磁阀是用来控制流体方向的自动化基础元件，属于执行器；通常用于机械控制和工业阀门使用，对介质方向进行控制，从而达到对阀门开关的控制电磁阀工作原理：蒸汽电磁阀里有密闭的腔，在不同位置都开有通孔，每个孔都通向不同的油管，腔中间是阀，两面是两块电磁铁，哪面的磁铁线圈通电阀体就会被吸引到哪边，通过控制阀体的移动来挡住或漏出不同的排油的孔，而进油的孔是常开的，液压油就会进入不同的排油管，然后通过油的压力来推动油缸的活塞，活塞又带动活塞杆，活塞杆带动机械装置运动。这样通过控制电磁铁的电流通断就控制了机械运动。

目前使用的蒸汽电磁阀，通常是过以下两种蒸汽的：

1、锅炉蒸汽-饱和蒸汽温度压力相对稳定，温度低于250℃，工作压力低于1.6Mp。

2、热电厂出来的蒸汽-过热蒸汽温度压力变化基数较大，温度*高可达400以上，工作压力则低于4.0Mpa。

自力式调节阀工作原理

1 、自力式调节阀工作原理（阀后压力控制） 

工作介质的阀前压力 P1 经过阀芯、阀座后的节流后，变为阀后压力 P2 。 P2 经过控制管线输入到执行器的下膜室内作用在顶盘上，产生的作用力与弹簧的反作用力相平衡，决定了阀芯、阀座的相对位置，控制阀后压力。当阀后压力 P2 增加时， P2 作用在顶盘上的作用力也随之增加。此时，顶盘的作用力大于弹簧的反作用力，使阀芯关向阀座的位置，直到顶盘的作用力与弹簧的反作用力相平衡为止。这时，阀芯与阀座的流通面积减少，流阻变大，从而使 P2 降为设定值。同理，当阀后压力 P2 降低时，作用方向与上述相反，这就是自力式（阀后）压力调节阀的工作原理。 

2 、自力式调节阀工作原理（阀前压力控制） 

工作介质的阀前压力 P1 经过阀芯、阀座后的节流后，变为阀后压力 P2 。同时 P1 经过控制管线输入到执行器的上膜室内作用在顶盘上，产生的作用力与弹簧的反作用力相平衡，决定了阀芯、阀座的相对位置，控制阀前压力。当阀后压力 P1 增加时， P1 作用在顶盘上的作用力也随之增加。此时，顶盘的作用力大于弹簧的反作用力，使阀芯向离开阀座的方向移动，直到顶盘的作用力与弹簧的反作用力相平衡为止。这时，阀芯与阀座的流通面积减大，流阻变小，从而使 P1 降为设定值。同理，当阀后压力 P1 降低时，作用方向与上述相反，这就是自力式（阀前）压力调节阀的工作原理。 

力士乐比例减压阀

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