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In the operation of machines and equipment,many controls are performed using hydraulic control mechanisms.In the case of continuous speed control,hydraulic control is usually more convenient and cheap.When the energy conversion efficiency is high,hydraulic control is often used at the same time as servo control in electric control.At this time,an electro-hydraulic actuator with high efficiency and precision is formed.

在机器与设备的操作中，许多控制是用液压控制机构来进行的。在连续速度控制的场合，液压控制通常比较方便和便宜，当能量转换效率较高的时候，液压控制往往和电动控制中的伺服控制同时使用。这时，就形成了效率和精度较高的电液执行机构。