KMPW single-seat pneumatic control valve by the pneumatic multi-spring diaphragm actuator and a low flow resistance, single-seat valves, the new executive body low height, light weight, easy assembly and calibration, the new body structure is compact, smooth flow, with a large flow coefficient. Stable operation of this product with reliable operating characteristics, small seat leakage, precise flow characteristics, large tuning range and so on. It is bound to the unique advantages of the wide range of applications to obtain high quality control results.