I am currently working on same kind of project except hazardous situation. Mine is more on Hot water system, but principle is the same.
Currently, we have manual ball valves in line. We have decided to use Sharpe SPNII115SR11 spring return Pneumatic actuator, sized for 80 psi, set to Fail Closed And Automax 81237AOT positioner, 4-20 mA input signal And Top mounted NXCLU2M11800200 limit switch box, mechanical Open/Closed Switches NEMA 4, to make it automated.
If you are not giving analog signal to control, you could just use limit box with mechanical open/close switches.
Hope this helps.
Currently, we have manual ball valves in line. We have decided to use Sharpe SPNII115SR11 spring return Pneumatic actuator, sized for 80 psi, set to Fail Closed And Automax 81237AOT positioner, 4-20 mA input signal And Top mounted NXCLU2M11800200 limit switch box, mechanical Open/Closed Switches NEMA 4, to make it automated.
If you are not giving analog signal to control, you could just use limit box with mechanical open/close switches.
Hope this helps.