Hello everyone, I am an engineer specializing in electric actuators. I can provide answers to any questions you may have in this area~

I would like to ask: what is the relationship between the 4–20mA signal supplied to the control valve and its linear travel? If the dial of the electric actuator shows a valve position of 0–100%, how is this related to the input current? Furthermore, what about the case where the actuator has a valve position feedback output signal? For example, with a 4mA input signal, the stroke might be at the lowest or highest position, and the valve position could be 0% or 100% – so how can this be defined through the menu? It would be best to upload a product manual from your company as an example. Thank you!

The East’s Invincible Fighter? After studying control valves for a few years, already speaking so confidently? It’s fine that Hai Chuan’s senior didn’t come to give you tough questions; it’s good to discuss and learn from each other

The tone is too harsh. . . There is no end to learning. The questions asked upstairs are mainly related to the settings of the control panel; the manufacturer provides user manuals that can be used as a guide for troubleshooting.

Reply to 2# denghl: First, adjust the electrical limit of the actuator to correspond to the valve’s open and closed positions. Second, enter the menu of the actuator and adjust its 4-20mA signal so that it matches the electrical limit. Third, ensure that the output signal corresponds to the input signal; for example, if the input signal is 4mA, the valve may be in its lowest or highest position, with a valve position of 0% or 100%. If this happens, the actuator has such a function – you just need to enter the menu. For more detailed information, you’ll need to refer to the manufacturer’s manual. I don’t have the manual on my computer right now, but I’ll upload it to you another day

Reply to 3# 780672698: There are many types of control valves, and their structures vary; however, they all operate in either angular or linear motion

I’m asking this question because I have a systematic learning plan. In my original post, there was a summary on \"action and reaction,\" which applied to pneumatic control valves and mechanical positioners. Next, we will start learning about pneumatic valves and intelligent positioners. In that post, I still have one question for a fellow member that I haven’t answered properly. Next is the electric actuator; since it does not have the issue of air-operated or pneumatically operated modes, its parameter configuration differs from that of intelligent actuators. With all these issues, my ultimate goal is to identify some common elements.

Master, I have a question: Initially, our linear electric analog actuator stopped working. We replaced the control module and the positioner, taking them from an angular-motion actuator, but it still didn’t work no matter what we tried. Could it be that we installed the positioner in the wrong position? I saw that the positioner has springs, so it might have been placed at the edge. For those positioners that use resistance measurement, just out of curiosity, how do I determine the correct wiring for the three wires connecting the control module to the positioner? I connected them according to the colors indicated online, and by using current measurements for feedback, I found that there was no pattern in the current changes at the two edges, while there was a pattern in the middle. The zero point and range are adjusted using a small rotating knob. Once it worked, but the reaction was in the wrong direction; when an input signal was applied, the motor caused the position signal to differ more and more from the input signal, when there should be only one direction of action. 3. I adjusted the dial settings, and both 5 and 6 were affected; the adjustments didn’t work as intended either. 5. There is no normal feedback current now; sometimes it stays at 22.8, and even when the position changes, the current remains unchanged. 6. The fault light is on all the time; it’s red

Dear electrical engineer, please give me some guidance: 1. What is the situation in which you have seen devices that are lightweight yet possess high output torque? Brand? Is it oil lubrication or grease lubrication? 2. How are the handwheels and electric switching devices of the actuators you’ve encountered – are they likely to cause injury? 3. What is the lifespan of the actuator you encountered? What are the main faults that occur? Thank you! !