Regulating valve issues
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The existing control valve maintains an opening degree of around 40% both at the site and during transmission during normal production. However, after some time, the opening degree at the site remains unchanged while it drops to around 20% during transmission, with a tendency to decrease further. After undergoing self-diagnosis, the control valve’s opening degree returns to around 40% both at the site and during transmission. Is there any problem with the control valve during this process?
The opening degree of the control valve changes in accordance with variations in your flow rate!
It’s probably a problem with the connector! On-site analysis of specific issues! This problem shouldn’t have happened!
Agree with the person above; it’s a problem with the internal structure of the control valve – it definitely isn’t in normal condition
There may be a problem with the actuator position transmitter of the control valve
The opening degree of the control valve is related to the actuator and transmitter; making some adjustments will resolve it.
First, use a signal generator to check if there are any issues with the valve; second, examine the wiring and channels
First, determine what type of valve position feedback transmitter it is; I think it needs to be recalibrated. This kind of problem only occurs with contact-type transmitters
It should be a problem with the feedback from the control valve. Check the line and locator 1
The on-site opening remains unchanged, but the signal transmitted is reduced, which indicates that the valve is stuck or there is a problem with the valve positioner
The valve is fine; is it the actuator that’s faulty? It is recommended to replace it with a positioning pneumatic type