电动机、油泵、液压控制阀和液压缸可装在同一轴线上，也可控需要装置在不同轴线上，只需接通电动机的控制电源，即可使活塞杆往复运动。液压控制阀组合是由溢流阀、调速阀、液压单向阀等阀组组成，可根据启闭机的工作待点设计不同油路形成的组合阀满足其工况要求。活塞杆的伸缩由电动机正反旋转控制，具有动作灵活，行程控制准确，过载保护等性能。当运行受阻时，油路中压力增高到调定的限额，溢流阀迅速而准确地溢流，实行过载保护，电动运转在额定值内不会烧毁。启闭机油路集成块中设计了自锁机构，当启闭机运行到调定行程终端时，电机自动停止转动，活塞杆则锁定在此位置上，处于保压状态。
The motor, oil pump, hydraulic control valve and hydraulic cylinder can be installed on the same axis or controllable. They need to be installed on different axes. Only by connecting the control power supply of the motor, the piston rod can move back and forth. The combination of hydraulic control valve is composed of relief valve, speed regulating valve, hydraulic one-way valve and other valve groups. According to the working waiting point of the hoist, the combination valve formed by different oil paths can be designed to meet the requirements of its working conditions. The telescopic piston rod is controlled by the positive and negative rotation of the motor, which has the characteristics of flexible action, accurate stroke control and overload protection. When the operation is blocked, the pressure in the oil circuit increases to the set limit, the relief valve overflows quickly and accurately, and overload protection is implemented, and the electric operation will not be burnt out within the rated value. The self-locking mechanism is designed in the integrated block of the oil circuit of the hoist. When the hoist runs to the end of the set stroke, the motor automatically stops rotating, and the piston rod is locked in this position and is in the pressure maintaining state.