电磁阀(Electromagnetic valve)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，更常用的是单向阀、安全阀、方向控制阀、速度调节阀等。

工作原理

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。

Electromagnetic Valve is an Electromagnetic control of industrial equipment, is used to control the fluid automation basic components, belongs to the actuator, is not limited to hydraulic, pneumatic. Used in industrial control systems to adjust the direction, flow rate, velocity, and other parameters of the medium. SOLENOID valve can cooperate with different circuits to achieve the desired control, and control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valve, different solenoid valve in the control system at different locations to play a role, the most commonly used is one-way valve, safety valve, direction control valve, speed control valve, etc. . Principle of operation there is an airtight cavity in the solenoid valve, with through holes in different positions, each hole is connected to a different oil pipe, the middle of the cavity is a piston, two electromagnets on both sides, which side of the magnet coil will be attracted to which side of the valve body, by controlling the movement of the valve body to open or close different drain holes, and the oil hole is always open, the hydraulic oil will enter different drain pipes, and then through the oil pressure to push the piston cylinder, the Piston in turn moves the Piston Rod, piston Rod driven mechanism. Thus by controlling the current of the electromagnet, the mechanical motion is controlled.