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Looking at the development history of control valves, the characteristics of their evolution are as follows: 1. The development of control valves is closely linked to the advancement of process control in industrial production. For example, single-seat valves have large unbalanced forces and cannot meet the control requirements of high pressure differences in industrial production processes; therefore, sleeve valves equipped with balance spools have been developed ； When control valve noise has become a significant environmental pollutant, many control valves with noise-reduction functions and noise-reducing valve components have emerged as a result ； When industrial production processes require conditions such as high temperatures, low temperatures, and resistance to leaks, elongable valve covers designed for these extreme conditions and valve covers sealed with bellows were developed. 2. The development of control valves is closely linked to improvements in product quality and reductions in raw material consumption, which leads to an increase in the variety of control valve products, expansion of their functions, and a broader range of applications. For example, the types of control valves include single-seat valves, double-seat valves, three-way valves, angle valves, sleeve valves, valve-body separated valves, diaphragm valves, high-pressure valves, eccentric rotary valves, eccentric disc valves, butterfly valves, gate valves, and so on ； Actuators include pneumatic diaphragm actuators, electro-hydraulic actuators, gear actuators, etc ； Valve positioners include pneumatic valve positioners, electrical valve positioners, intelligent electrical valve positioners, and so on. 3. The development of control valves has made industrial applications more convenient, flexible, and reliable. More appropriate calculation formulas are used for the design calculations of control valves ； The installation and maintenance of control valves have become more convenient ； The design of the control valve’s internal components, such as flow path design, material selection, and noise reduction measures, enables broader industrial applications and more reliable operation.