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电磁阀(Electromagneticvalve)是用电磁控制的工业设备，是用来控制流体的自动化基础元件，属于执行器，并不限于液压、气动。用在工业控制系统中调整介质的方向、流量、速度和其他的参数。电磁阀可以配合不同的电路来实现预期的控制，而控制的精度和灵活性都能够保证。电磁阀有很多种，不同的电磁阀在控制系统的不同位置发挥作用，*常用的是单向阀、安全阀、方向控制阀、速度调节阀等。
电磁阀里有密闭的腔，在不同位置开有通孔，每个孔连接不同的油管，腔中间是活塞，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开启或关闭不同的排油孔，而进油孔是常开的，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。这样通过控制电磁铁的电流通断就控制了机械运动。
1)当电磁阀需要长时间开启，并且持续的时间多于关闭的时间应选用常开型;
2)要是开启的时间短或开和关的时间不多时，则选常闭型;
3)但是有些用于安全保护的工况，如炉、窑火焰监测，则不能选常开的，应选可长期通电型。
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