Pneumatic diaphragm control valve is composed of pneumatic multi-spring-film actuator and low-flow resistance single-seat valve. The new actuator is low height, light weight, simple equipment. The new valve body has compact structure, smooth flow channel and large flow coefficient. This product has stable operation, reliable action characteristics, small seat leakage, accurate flow characteristics, wide adjustable range and other characteristics, it will be unique advantages in the wide application to achieve high quality control effect. Products have standard type, adjustment cut off type, bellows sealing type, jacket insulation type and other varieties. Applicable liquid temperatures range from-200℃ to + 560℃.