Are there several principles that must be followed when setting the pneumatic control valves of each brand?
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I have Fisher and Yamaki valve positioners along with the corresponding control valves; when performing re-tuning, I set the valve to 50% open position and ensure that the feedback rod and positioning pin are at 90 degrees, followed by self-tuning. Are the steps the same for other brands as well? ?
Generally, the travel angle of a positioner should be between -56 and +56°; otherwise, it will not pass the verification