电磁换向阀在液压系统中的作用是用来实现液压油路的换向、顺序动作及卸荷等。由于电磁铁的推力有限，电磁换向阀应用在流量不大的液压系统中。
(1)结构原理
电磁换向阀是液压控制系统和电气控制系统之转换元件。它由液压机械中的按钮开关、限位开关、行程开关、压力继电器等电气元件发出信号，使电磁铁通电吸合或断电释放，从而直接控制阀芯移位，来实现油流的沟通、切断和方向变换，来操纵各执行机构的动作。推动故障检查按钮可使滑阀阀芯手推移动。
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