1、 What are the characteristics of electric valve actuators?

电力驱动阀门是常用的驱动方式的阀门，通常称这种驱动装置形式的驱动装置为阀门电动装置，阀门电动装置的特点如下：

Electric drive valve is a commonly used drive method of valve, which is commonly referred to as valve electric device. The characteristics of valve electric device are as follows:

1.启闭迅速，可以大大缩短启闭阀门所需的时间;

1. Quick opening and closing can greatly shorten the time required to open and close the valve;

2.可以大大减轻操作人员的劳动强度，特别适用于高压、大口径阀门;

2. It can greatly reduce the labor intensity of operators, especially suitable for high-pressure and large-diameter valves;

3.适用于安装在不能手动操作或难于接近的位置，易于实现远距离操纵，而且安装高度以不受限制;

3. Suitable for installation in positions that cannot be manually operated or are difficult to access, easy to achieve remote control, and the installation height is not limited;

4.有利于整个系统的自动化;

4. It is beneficial to the automation of the entire system;

5.电源比气源和液源容易获得，其电线的敷设和维护也比压缩空气和液压管线简单得多。

5. The power supply is easier to obtain than air and liquid sources, and the laying and maintenance of its electric wires is also much simpler than compressed air and hydraulic pipelines.

二.如何正确选择阀门电动装置?

2、 How to correctly select the valve electric device?

1.操作力矩

1. Operating torque

操作力矩是选择阀门电动装置的更主要参数，电动装置输出力矩应为阀门操作力矩的1.2～1.5倍

Operating torque is the most important parameter for selecting a valve electric device, and the output torque of the electric device should be 1.2 to 1.5 times the maximum operating torque of the valve

2.操作推力

2. Operating thrust

阀门电动装置的主机结构有两种：一种是不配置推力盘，直接输出力矩;另一种是配置推力盘，输出力矩通过推力盘中的阀杆螺母转换为输出推力。

The main structure of the valve electric device has two types: one is to directly output torque without configuring a thrust disk; The other is to configure a thrust disk, where the output torque is converted into output thrust through the valve stem nut in the thrust disk.

输出轴转动圈数阀门电动装置输出轴转动圈数的多少与阀门的公称通径、阀杆螺距、螺纹头数有关，要按M=H/ZS计算(M为电动装置应满足的总转动圈数，H为阀门开启高度，S为阀杆传动螺纹螺距，Z为阀杆螺纹头数)。

The number of turns of the output shaft of the electric device of the valve is related to the nominal diameter of the valve, the pitch of the valve stem, and the number of thread heads. It should be calculated based on M=H/ZS (M is the total number of turns that the electric device should meet, H is the valve opening height, S is the pitch of the valve stem transmission thread, and Z is the number of valve stem thread heads).

阀杆直径对多回转类明杆阀门，如果电动装置允许通过的阀杆直径不能通过所配阀门的阀杆，便不能组装成电动闸阀。因此，电动装置空心输出轴的内径必须大于明杆阀门的阀杆外径。对部分回转阀门以及多回转阀门中的暗杆阀门，虽不用考虑阀杆直径的通过问题，但在选配时亦应充分考虑阀杆直径与键槽的尺寸，使组装后能正常工作。

For multi rotation rising stem valves, if the maximum allowable valve stem diameter of the electric device cannot pass through the valve stem of the equipped valve, it cannot be assembled into an electric gate valve. Therefore, the inner diameter of the hollow output shaft of the electric device must be greater than the outer diameter of the stem of the rising stem valve. For non rising stem valves in partial rotation valves and multi rotation valves, although the passage of the valve stem diameter is not considered, full consideration should also be given to the diameter of the valve stem and the size of the keyway during selection to ensure normal operation after assembly.

3.输出转速

3. Output speed

阀门的启闭速度若过快，易产生水击现象。因此，应根据不同使用条件，选择恰当的启闭速度。

If the opening and closing speed of the valve is too fast, it is easy to generate water hammer phenomenon. Therefore, appropriate opening and closing speeds should be selected based on different usage conditions.