液压执行元件（hydraulic actuator），是把液体压力能转换成机械能的装置，包括液压马达和液压缸。
通过交流变频调速改变电机的转速来调节液压泵的输出流量。控制液压执行元件的运动速度。
Changing the speed of electric motor by using ac frequency conversion is to regulate output flow of hydraulic pump to control the velocity of the motion of hydraulic actuator.
液压缸具有结构简单，工作可靠，制造容易和使用维护方便等优点，是应用最广的液压执行元件。
Hydraulic cylinder is simple, reliable, easy to manufacture and use of the advantages of easy maintenance, is the most widely hydraulic actuators.
开式系统是指液压泵从油箱吸油，油经各种控制阀后，驱动液压执行元件，回油再经过换向阀回油箱。
Open system is the pump suction from the tank, the oil through a variety of control valves, the drive hydraulic actuators, valve oil return back for another fuel tank.
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