原文：
电磁阀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。电磁阀用于控制液压流动方向，工厂的机械装置一般都由液压钢控制，所以就会用到电磁阀。 电磁阀的工作原理，电磁阀里有密闭的腔，在的不同位置开有通孔，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档住或漏出不同的排油的孔，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刚的活塞，活塞又带动活塞杆，活塞竿带动机械装置动。这样通过控制电磁铁的电流就控制了机械运动。 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)，而从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、直动活塞结构、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向上提起，阀门打开。当入口与出口达到启动压差时，通电后，电磁力先导小阀，主阀下腔压力上升，上腔压力下降，从而利用压差把主阀向上推开；断电时，先导阀利用弹簧力或介质压力推动关闭件，向下移动，使阀门关闭。 特点： 在零压差或真空、高压时亦能可动作，但功率较大，要求必须水平安装。 先导式电磁阀： 原理：通电时，电磁力把先导孔打开，上腔室压力迅速下降，在关闭件周围形成上低下高的压差，流体压力推动关闭件向上移动，阀门打开；断电时，弹簧力把先导孔关闭，入口压力通过旁通孔迅速腔室在关阀件周围形成下低上高的压差，流体压力推动关闭件向下移动，关闭阀门。 特点： 流体压力范围上限较高，可任意安装(需定制)但必须满足流体压差条件 。

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译文：
Solenoid valve is used to control the automation of basic components of fluid, is actuator; not limited to hydraulic, pneumatic. Solenoid valve used to control the direction of hydraulic flow machines in plant generally controlled by hydraulic cylinder, the solenoid valve will be used. The working principle of electromagnetic valve, solenoid valve in a closed chamber, in a different position with holes, each hole leads to a different pipeline, valve chamber in the middle, both sides are two electromagnets, which face the magnet coil power valve will be attracted to which side, by controlling the body's movement to a different file live or leaked oil discharge hole, and into the hole is always open, hydraulic oil flows to different hoses, and then oil pressure to push oil just the piston, piston rod then drive the piston rod drive mechanism moving. This current by controlling the electromagnet to control the mechanical movement. History dating back solenoid valve, to date, at home and abroad from the principle of the solenoid valve is divided into three classes (ie: direct acting, pilot-step child), but from the disc structure and the different materials and The difference principle branch is divided into six categories (direct-acting diaphragm structure, step-heavy film structure, membrane structure, leading, direct-acting piston structure, step-direct-acting piston structure, the pilot piston structure). Direct-acting solenoid valve: Principle: power, the electromagneticcoil of electromagnetic force to close the cases filed from the seat on the valve to open; power, the electromagnetic force disappears, the spring pressure to close cases in the seat, the valve closed. Features: in a vacuum, negative pressure, zero pressure when working properly, but the path is generally not more than 25mm. Distribution of direct-acting solenoid valve: Principle: It is a direct-acting and pilot-style combination of theory, there is no pressure when the inlet and outlet, the power, the electromagnetic force directly to the pilot valve and main valve closure of small pieces turn upward, the valve opens. When the entrance and exit to start the pressure difference, the power, the electromagnetic force small pilot valve, main valve chamber under increased pressure, the chamber pressure drops, which use pressure to push up the main valve; power, the pilot valve with a spring or to medium pressure to promote the closure of parts, moving down to the valve closed. Features: zero pressure or vacuum, hypertension can also be action, but the power is larger, the level required to be installed. Pilot solenoid valve: Principle: power, the electromagnetic force to open the pilot hole, the chamber pressure to drop rapidly formed around the closure on the lower parts of high pressure, fluid pressure to promote the closure of parts moving up, the valve opens; power, the spring force to pilot hole closed, the inlet pressure chamber through the bypass hole quickly formed around the valve off under the high pressure low on fluid pressure to promote the closure of parts moving down, close the valve. Features: limit the scope of a high fluid pressure can be any installation (required custom), but must meet the conditions of fluid pressure.