Solutions for adjusting the backlash of control valves
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There is an existing control valve, with a Fisher DV6200 actuator. After stroke verification, the backlash is extremely large. Everyone, please help come up with a feasible solution
Is it because the gas consumption is too high that a speed booster is needed?
Is it a problem with the locator?
Check whether the positioning rod of the locator is loose, whether the valve stem of the control valve is in contact with anything, and whether the outputs from the positive and negative sides of the locator are consistent..........
Check whether the feedback rod is loose, whether the packing is too tight, etc. There should be sensitivity adjustments available in the locator; try adjusting the locator again. Additionally, the original poster could provide more details regarding the large backlash issue
1. Reduce the motion resistance of the actuator； 2. Use a valve positioner.
What the original poster said is not detailed enough
There may be sticking, and it’s also possible that the travel rod is loose.
Disconnect the positioner from the control valve and determine whether the problem lies with the positioner or the actuator； The main reasons for the deterioration caused by control valves are the valve stem and packing. The main reason for the degradation caused by positioners lies in assembly (including the internal assembly of mechanical positioners). In addition, when checking for deterioration of the control valve (including stroke), it should be done away from the starting point of valve opening, based on the inspection at that starting point.
This involves technical issues; I have dealt with exactly the same problems on site. If it’s convenient for you, please send an email to 2745827156@qq.com. I will provide you with detailed answers as well as the corresponding steps to follow