How to determine whether an electric valve is actually open or closed
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The PLC shows that the electric valve is open, but upon inspection it is actually not open at all. It’s still closed. Is this a common situation in industry? ? How was it resolved
There should be a limit switch; check to see if there are any issues
Finally, it relies on the actual site conditions; if everything on-site is incorrect, how can anything implemented using DCS be correct?
Typical electric actuators are equipped with limits for the open and closed positions of the valve; these two signals can be sent back to the DCS to monitor the status. Of course, if it is suspected that there might be a problem with the opening or closing of the valve, it is necessary to go to the site to verify the situation.
Is the switch feedback connected in reverse? If it can move, just take a look