Oneaction pneumatic forged ball valve with high-pressure duplex solenoid valves have been completed by SEV and sent to construction site to customers. This kind of pneumatic ball valves, compared with other pneumatic ball valves, increase protecting factor of pneumatic action. It has two solenoid valve which will make the valve to meet working requirement if any one of them is connected, and one of them can still perform well while another one not works, this increases much of reliability of valve action on the pipeline.