Is there really a problem with this self-regulating valve?
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One of the automatic control valves in our facility is used to regulate the pressure in the steam drum. Previously, its automatic control function maintained a stable pressure level, but recently a strange problem has arisen: the valve fails to operate without any apparent reason. The instrumentation technicians went to the site to check, and they said that the display on the gauge had changed, which was causing the valve to not function. However, we are sure that no one has touched that valve. This problem has occurred twice now, and it’s quite dangerous. Can someone help me understand what’s going on? Thanks. (In another interface, the data displayed in the table header is 203, rather than the specified valve position.)
Bring the manufacturer’s after-sales service staff
I would like to ask what it means when \"the display interface of the table header changes, preventing any actions from being taken\"”
The issue of automatic control valves not moving is quite common in factories; all that’s needed is an on-site inspection: 1. Check whether the valve core is stuck； 2. Is there a problem with the locator? ； 3. Is there a problem with the transmitter? ； 4. Is there a problem with the diaphragm box? ； As long as one checks each item one by one, the root cause of the problem will eventually be identified.
It’s an intelligent locator, right? Is 203 a fault code?
Someone must have touched it. Your valve is probably a self-acting pressure control valve! Someone must have increased the pressure, which is why it won’t function properly. You should use a pressure gauge to adjust the pressure value of the valve back to the correct level
A simple way to determine whether a control valve is functional is to disconnect the positioner and supply air to it to see if it operates. If there is no fault with the valve positioner, it can be switched to manual mode to check whether the control valve can be adjusted!