Non-intelligent locator calibration
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I have a question for everyone: do you have any good experiences or tips when repairing those non-intelligent positioners? Could you share some tips? Sometimes, it takes a long time to adjust a locator, and it’s not clear where the problem lies. Thank you
1. Whether the valve is properly assembled. 2. Are the valve accessories and gas circuit accessories appropriate? 3. Whether the pneumatic valve positioner is appropriately selected. 4. Whether personal knowledge and experience are sufficient. 5. Has the experienced master hidden some tricks from you? (Haha, my master hid it back then.) ) It’s just my personal opinion, for reference only.
First, ensure that there are no dead zones throughout the entire range of movement, and then proceed with the installation； Second, ensure that there are no leaks in the gas line connections ； Third, none of the components of the locator are damaged, such as spring aging, wear of the baffles, wear of the nozzles, or air leakage from the diaphragm in the gas chamber, etc ； Fourth, the zero point and range need to be adjusted in conjunction with each other; this is a matter of experience – over time, one gains expertise in it. In fact, sometimes valve problems can also affect the positioner, such as diaphragm leakage or valve stem jamming, and so on ；
Main issue: The constant-throttle orifice is blocked. Secondly, do not change the range arbitrarily. Thirdly, make sure to note whether the feedback board has been flipped after removing the actuator; proper markings should be made. When removing it on-site, mark the connection parts between the valve body and the actuator
Whether to swap the side of the feedback plate depends on the actual conditions on site, that is, whether the valve operates in direct action or only in reverse action.
At 50% position, the feedback rod should be installed horizontally. I don’t know what problem you’re facing? What do you mean by it not being adjustable?
At 50% position, the feedback rod should be installed horizontally. I don’t know what problem you’re facing? What do you mean by it not being adjustable?
Prerequisites: 1. The valve is free of faults, its zero position and range have been correctly adjusted, and there is no dead zone throughout the entire range of motion; the valve and its associated pneumatic components are properly installed. 2. The valve actuator is free of faults. Proper installation of the valve actuator: 1. Select the appropriate length for the feedback rod and feedback arm of the valve actuator based on the valve’s range of motion. 2. At 50% of the valve’s range of motion, adjust the feedback rod so that it is horizontal, then fix the valve actuator in place. Once these conditions are met, the zero position and range of the valve actuator can be fine-tuned again to meet the required specifications.