The Pneumatic ball valve is a rotary ball valve with a 90° angle, with excellent sealing performance, large flow capacity, small flow resistance coeffici- ent, simple structure, convenient maintenance and long service life. The valve body channel and the link pipe have the same diameter and form one diameter, and the medium can flow through almost without loss. It is widely used in petroleum, chemical industry, light industry, paper making, fire fighting, water system, etc.