Pneumatic eccentric ball valves can be equipped with a valve positioner to receive control signals (4-20mADC or 1-5VDC) and operate via compressed air supply. Alternatively, they can be fitted with travel limit switches, solenoid valves, pressure reducing valves, and a 0.4-0.7MPa air source to achieve on/off operation, while also providing two pairs of passive contact signals to indicate valve status. The pneumatic eccentric half-ball valve is an angular-travel regulating valve that controls fluid flow by rotating a portion of the ball valve plate around an eccentric axis.