The electric valve positioner is the main accessory of the control valve. It takes the valve stem displacement signal as the input feedback measurement signal and the controller output signal as the setting signal for comparison. When there is deviation between the two, it changes the output signal to the actuator to make the actuator operate, and establishes the one-to-one correspondence between the valve stem displacement and the controller output signal. Next, I will introduce the function of electric valve positioner.

1、電氣閥門定位器是對調節質量高要求的調節系統，需要提高調節閥的定位準確及加大可靠性。

1. Electric valve positioner is a regulation system with high requirements for regulation quality. It is necessary to improve the positioning accuracy and reliability of the regulation valve.

2、安裝在于閥門兩端壓差大于1MPa的地方。通過加大氣壓增加啟動器的輸出力，克服流體對閥芯產生的異力降低行程中的誤差。

2. It is installed where the pressure difference at both ends of the valve is greater than 1MPa. By increasing the air pressure, the output force of the starter is increased to overcome the different force of the fluid on the valve core and reduce the error in the stroke.

3、為避免對外泄漏，當流動流體中包含高溫、高壓、低溫、有毒、易燃、易爆等狀態時通常會將填充物擠壓得十分嚴實，使用閥桿和填充物之間的摩擦力增加，此時再用定位器可克服時滯情況。

3. In order to avoid external leakage, when the flowing fluid contains high temperature, high pressure, low temperature, toxic, flammable, explosive and other states, the filler will usually be squeezed very tightly, and the friction between the valve rod and the filler will increase. At this time, the time lag can be overcome by using the positioner.

4、當流體為粘性流體或流體中含有固體懸浮物時，使用定位器可以降低流體對閥桿移動的阻力。

4. When the fluid is viscous or contains solid suspended solids, the use of a positioner can reduce the resistance of the fluid to the movement of the valve stem.

5、定位器還具備克服控制信號的傳遞滯后，讓閥門的動作反應速度更快。

5. The positioner can also overcome the transmission lag of the control signal and make the action response speed of the valve faster.

6、調節閥的流動流量特性。

6. Flow characteristics of regulating valve.

7、當單個調節器控制兩個執行器時可以使用兩個定位器，以一個低程動作，另一個高程動作。分別接受低輸入信號和高輸入信號，達到分程調節狀態。

7. When a single regulator controls two actuators, two positioners can be used, one for low range action and the other for elevation action. Receive low input signal and high input signal respectively to achieve split range regulation.

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