电磁阀：用于液体和气体管路的开关控制，是两位DO控制。一般用于小型管道的控制。 电磁阀：只能用作开关量，是DO控制，只能用于小管道控制，常见于DN50及以下管道，往上就很少了。 1.开关形式： 电磁阀通过线圈驱动，只能开或关 ，开关时动作时间短。 2.工作质： 电磁阀一般流通系数很小，而且工作压力差很小。比如一般25口径的电磁阀流通系数比15口径的电动球阀小很多。电磁阀的驱动是通过电磁线圈，比较容易被电压冲击损坏。相当于开关的作用，就是开和关2个作用。 电磁阀一般断电可以复位，电动阀要这样的功能需要加复位装置。 3.适用工艺： 电磁阀适合一些特殊地工艺要求，比如泄漏、流体介质特殊等，价格较贵。

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原文：
Solenoid valve: for liquid and gas pipeline of the switch control, is 2 DO control. Are generally used for small pipe control. Solenoid valve: the amount can only be used as a switch is a DO control, can only be used for small pipe Instrumentation Ball Valves controls, common in DN50 and below pipes up very much. 1. Switch Type: Solenoid valve through the coil drive, can only be on or off, switch, action time is short. 2. The nature of work: Solenoid valve flow coefficient in general is very small, and the work of a  small pressure difference.Needle &Gauge Valves For example the general 25-caliber electromagnetic valve flow coefficient than the 15-caliber electric valve is much smaller. Solenoid valve driven by electromagnetic coils, voltage surge damaged more easily. The equivalent of switching function, that is the role of open and closed two. General power outageInstrument Manifolds can be reset solenoid valve, electric valve should be such a function need to add reset device. 3. Application process: Solenoid valve is suitable to process some special requirements, such as leakage of fluid medium special and so on, the price more expensive.

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