What are the signals for electric cut-off valves?
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Since electric cut-off valves have DCS commands to control their opening, closing, and shutdown, as well as DCS indications showing their open or closed status, is it possible to require such valves to have an analog 4–20 mA feedback signal? If possible, what accessories need to be added? What’s the cost? Are electric cut-off valves and electric control valves two different types of valves, or does one valve encompass all those functions, with the appropriate signals being connected as needed?
I don’t understand why an analog feedback signal is required for the cut-off valve
This is an electric actuator with intermediate stop function, right? It should come equipped with that feature when purchased; if feedback on the valve position is needed, adding an analog circuit board might solve the problem! ! ! ! ! ! ! !
Generally, those with intermediate stops require analog feedback; otherwise, you won’t know at what position it has stopped.
This post was last edited by shiwendong on 2017-6-14 at 13:21. Explosion-proof electric cut-off valves can be equipped with feedback limit switches that provide an analog signal of 4–20 mA, indicating the degree to which the valve is open or closed