Q641F(PPL, M)-16/25 pneumatic soft seal ball valve is a rotary valve with a turning angle of 90°. Excellent sealing performance, large flow coefficient, small flow resistance coefficient, simple structure, long service life, easy maintenance. The pneumatic soft seal ball valve is matched with the electrical valve positioner, and the operation can be controlled by entering the 4~20mADC signal and 0.4~0.7MPa air source to realize the adjustment of pressure, flow, temperature, liquid level and other parameters. It is also equipped with stroke limit switch, solenoid valve, pressure reducing valve and 0.4-0.7MPa air source to realize switching operation, and send two pairs of passive contact signals to indicate the switch of the valve. Pneumatic soft seal ball valve has the advantages of simple connection, compact structure, stable and reliable action. Pneumatic soft seal ball valve is widely used in system control in chemical, petroleum, textile, electric power, food and pharmaceutical, refrigeration, and paper industries.