What interlocks are available for the special valves in the coke tower of a coking unit?

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Discussion topics: 1. Do the special valves in everyone’s coking towers have any interlocks? We have interlocks for the bottom valve and the top valve; the main tower top pressure is less than 15 kPa, and the temperature of the oil and gas at the tower top is less than 90°C. There are also some feed interlocks for the four-way valve. Is there any upper-level sequence control? Isn’t such security assurance great? Are there any problems? 3. Current DCS systems are capable of controlling the opening and closing of special valves; is it possible to issue an approval or denial command via the DCS each time such an operation is to be carried out, thereby controlling the actions of the personnel on site? This seems feasible, but is it already being done in practice? We took measures to prevent them from opening the bottom and top covers; without DCS confirmation, it is not possible to open these covers on site. Thank you all for your discussions and guidance!