Pneumatic explosion-proof ball valves, equipped with explosion-proof travel limit switches, explosion-proof solenoid valves, pressure reducing valves, and a 0.4-0.7MPa air supply, can perform on/off operations and transmit two sets of passive contact signals to indicate valve status. Actuators are available in single-acting and double-acting models. The advantage of single-acting actuators is that in the event of a power source failure, the pneumatic explosion-proof ball valve will automatically maintain its open or closed position as required by the control system.