Two signal-controlled control valves
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Can two signals be used to control one control valve? Adjust the discharge control valve of the reaction vessel according to temperature, and automatically close it during feeding. DCS system
Yes, temperature and flow rate can be used to form a cascade control system.
Use a temperature control valve, and interlock the closing of the valve with the feed signal.
Select control. Programming implementation of DCS system.
It can be achieved by setting up an interlock in the DCS. When the feed flow rate > 0, this control valve MV = 0. Alternatively, you can add a solenoid valve to the control valve’s air line to directly interlock and cut off the flow. That’s what the original poster meant, right?
One control signal, one switch signal
Sure, create a program to interlock the two valves
Common cascade control and multi-loop logic control can meet the requirements.