The common faults of valve electric actuator are as follows: the protection level of valve knowledge is low. The special electric actuator for valve matched with electric actuator is fully enclosed squirrel cage structure, short-time intermittent working system (10 minutes) self cooling type. The protection level required is also different due to different service conditions and environment of the valve. Low protection grade will cause damp in the inner cavity of the electric actuator or invasion of foreign matters such as dust, and damage caused by the decrease of insulation resistance of the electric actuator.

包装、运输及保管不当阀门电动执行器包装应有防雨、防潮、防尘措施。运输过程中应有防雨措施，产品到现场后应存放在通风、干燥处，不得露天存放。禁止在阴雨天气调试或检修，调试完毕后要拧紧全部紧固件，以保证电气部分密封严密可靠。

Improper packaging, transportation and storage. The packaging of valve electric actuator shall be provided with rain proof, moisture-proof and dust-proof measures. Rain proof measures shall be taken during transportation. After the products arrive at the site, they shall be stored in a ventilated and dry place and shall not be stored in the open air. Commissioning or maintenance in rainy weather is prohibited. After commissioning, all fasteners shall be tightened to ensure tight and reliable sealing of electrical parts.

良工阀门电动执行器选型与行程位置调整控制不当阀门电动执行器有两个重要参数：启闭力矩值应包括阀门实际工作扭矩值加上阀门自身扭矩值，启闭力矩大小影响阀门使用，力大易坏，力小易漏。在选型配套上应有足够的余量（一般要求大于阀门实际操作转矩值1.1～1.3倍）。

The selection and stroke position adjustment of the electric actuator of Lianggong valve are not properly controlled. The electric actuator of the valve has two important parameters: the opening and closing torque value shall include the actual working torque value of the valve plus the torque value of the valve itself. The opening and closing torque affects the use of the valve. Large force is easy to break and small force is easy to leak. There shall be sufficient margin in type selection and matching (generally, it is required to be 1.1 ~ 1.3 times greater than the actual operating torque value of the valve).

行程位置控制与阀门口径大小、启闭时间长短及结构形式等有关。良工阀门电动执行器配套的电动执行器为专用电动执行器，短时工作制，时间10–15min。如在短时工作时间内高负载，造成电动执行器发热绝缘等级下降造成损坏。

The stroke position control is related to the valve diameter, opening and closing time and structural form. The electric actuator matched with the electric actuator of Lianggong valve is a special electric actuator with a short-time working system for 10 – 15min. In case of high load during short working hours, the electric actuator will be heated and the insulation grade will be reduced, resulting in damage.

阀门电动执行器与电动执行器型号不匹配所选的电动执行器型号与电动执行器要求不匹配，实际输出力矩未留有足够相应的余量，超载荷运转时易造成电动执行器损坏。电器保护失灵，电器元件质量差良工阀门电动执行器内的微动开关是控制机构的关键零部件，当阀门过行程位置时，微动开关切断电源，起过载保护作用。

The model of the electric actuator of the valve does not match the model of the electric actuator, the selected model of the electric actuator does not match the requirements of the electric actuator, and the actual output torque does not leave enough corresponding margin, which is easy to cause damage to the electric actuator during overload operation. The electrical protection fails and the quality of electrical components is poor. The microswitch in the electric actuator of Lianggong valve is the key part of the control mechanism. When the valve is in the over travel position, the microswitch cuts off the power supply and plays the role of overload protection.

大多数电动执行器厂家将行程与力矩保护串联在一起，当超行程或超力矩时，微动开关及时切断交流接触器线圈控制电源，从而切断电动执行器主回路。调试安装使用不当阀门电动执行器分为水平安装和垂直安装两种。在垂直安装时电动执行器尾端在下方。

Most electric actuator manufacturers connect the travel and torque protection in series. When the travel or torque is exceeded, the microswitch will cut off the control power supply of the AC contactor coil in time, so as to cut off the main circuit of the electric actuator. Improper commissioning, installation and use of valve electric actuator can be divided into horizontal installation and vertical installation. When installed vertically, the tail end of the electric actuator is below.