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(duì)調(diào)節(jié)質(zhì)量高要求的調(diào)節(jié)系統(tǒng)，需要提高調(diào)節(jié)閥的定位準(zhǔn)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(guò)加大氣壓增加啟動(dòng)器的輸出力，克服流體對(duì)閥芯產(chǎn)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(duì)外泄漏，當(dāng)流動(dòng)流體中包含高溫、高壓、低溫、有毒、易燃、易爆等狀態(tài)時(shí)通常會(huì)將填充物擠壓得十分嚴(yán)實(shí)，使用閥桿和填充物之間的摩擦力增加，此時(shí)再用定位器可克服時(shí)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(dāng)流體為粘性流體或流體中含有固體懸浮物時(shí)，使用定位器可以降低流體對(duì)閥桿移動(dòng)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(hào)的傳遞滯后，讓閥門的動(dòng)作反應(yīng)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(diào)節(jié)閥的流動(dòng)流量特性。

6. Flow characteristics of regulating valve.

7、當(dāng)單個(gè)調(diào)節(jié)器控制兩個(gè)執(zhí)行器時(shí)可以使用兩個(gè)定位器，以一個(gè)低程動(dòng)作，另一個(gè)高程動(dòng)作。分別接受低輸入信號(hào)和高輸入信號(hào)，達(dá)到分程調(diào)節(jié)狀態(tài)。

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 http://egsam.com