1、 What are the characteristics of electric valve actuators?

電力驅動閥門是常用的驅動方式的閥門，通常稱這種驅動裝置形式的驅動裝置為閥門電動裝置，閥門電動裝置的特點如下：

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.啟閉迅速，可以大大縮短啟閉閥門所需的時間;

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

2.可以大大減輕操作人員的勞動強度，特別適用于高壓、大口徑閥門;

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

3.適用于安裝在不能手動操作或難于接近的位置，易于實現遠距離操縱，而且安裝高度以不受限制;

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.有利于整個系統的自動化;

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

5.電源比氣源和液源容易獲得，其電線的敷設和維護也比壓縮空氣和液壓管線簡單得多。

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.如何正確選擇閥門電動裝置?

2、 How to correctly select the valve electric device?

1.操作力矩

1. Operating torque

操作力矩是選擇閥門電動裝置的更主要參數，電動裝置輸出力矩應為閥門操作力矩的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

閥門電動裝置的主機結構有兩種：一種是不配置推力盤，直接輸出力矩;另一種是配置推力盤，輸出力矩通過推力盤中的閥桿螺母轉換為輸出推力。

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.

輸出軸轉動圈數閥門電動裝置輸出軸轉動圈數的多少與閥門的公稱通徑、閥桿螺距、螺紋頭數有關，要按M=H/ZS計算(M為電動裝置應滿足的總轉動圈數，H為閥門開啟高度，S為閥桿傳動螺紋螺距，Z為閥桿螺紋頭數)。

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).

閥桿直徑對多回轉類明桿閥門，如果電動裝置允許通過的閥桿直徑不能通過所配閥門的閥桿，便不能組裝成電動閘閥。因此，電動裝置空心輸出軸的內徑必須大于明桿閥門的閥桿外徑。對部分回轉閥門以及多回轉閥門中的暗桿閥門，雖不用考慮閥桿直徑的通過問題，但在選配時亦應充分考慮閥桿直徑與鍵槽的尺寸，使組裝后能正常工作。

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.輸出轉速

3. Output speed

閥門的啟閉速度若過快，易產生水擊現象。因此，應根據不同使用條件，選擇恰當的啟閉速度。

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.