Pneumatic wafer-type butterfly valves, as the name suggests, employ a wafer-style installation. The butterfly valve is sandwiched between the flanges at both ends of the pipeline and secured by a set of bolts passing through bolt holes. The valve body of a pneumatic wafer-type butterfly valve is compact with relatively thin walls, making it particularly suitable for applications where the distance between pipe flanges is limited or space is constrained. Based on sealing structure, these valves are categorized into soft-seal and metal-seal types. Soft-seal butterfly valves feature a centerline design, offering advantages such as corrosion resistance and zero leakage. In contrast, metal-seal butterfly valves employ a triple-offset configuration, delivering benefits like reduced wear and extended service life.