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、电气阀门定位器是对调节质量高要求的调节系统，需要提高调节阀的定位准确及加大可靠性。

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、安装在于阀门两端压差大于1MPa的地方。通过加大气压增加启动器的输出力，克服流体对阀芯产生的异力降低行程中的误差。

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、为避免对外泄漏，当流动流体中包含高温、高压、低温、有毒、易燃、易爆等状态时通常会将填充物挤压得十分严实，使用阀杆和填充物之间的摩擦力增加，此时再用定位器可克服时滞情况。

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、当流体为粘性流体或流体中含有固体悬浮物时，使用定位器可以降低流体对阀杆移动的阻力。

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、定位器还具备克服控制信号的传递滞后，让阀门的动作反应速度更快。

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

6、调节阀的流动流量特性。

6. Flow characteristics of regulating valve.

7、当单个调节器控制两个执行器时可以使用两个定位器，以一个低程动作，另一个高程动作。分别接受低输入信号和高输入信号，达到分程调节状态。

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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The above is the detailed introduction of Shanghai Lianggong valve. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service //www.rabieb.com