Sanitary pneumatic three-way ball valves undergo precise inspection procedures and stringent quality control. During manufacturing, flow passages receive precision polishing and sterilization treatment. The structure comprises a three-piece valve body, with the central valve body and ball clamped between two halves by four external long bolts. The fully enclosed seal ring tightly wraps around the ball, eliminating gaps and dead corners. Both ends feature clamp connections for easy disassembly, cleaning, and maintenance. The operating principle involves a pneumatic actuator rotating the ball 90 degrees to facilitate the flow or blockage of the medium.