Rectangular ventilation butterfly valve

The rectangular ventilation butterfly valve is a specialized duct control device designed exclusively for rectangular ventilation and exhaust duct systems. Unlike round butterfly valves that apply to circular pipelines, this rectangular series features a square and flat structural layout that perfectly matches standard rectangular duct sizes, making it the most commonly used flow regulation and shut-off component in building HVAC, industrial ventilation, dust removal and flue gas exhaust projects. It is mainly applied to adjust air volume, balance system pressure, isolate pipeline airflow and protect downstream equipment, delivering stable and reliable performance under normal temperature and medium-duty industrial working conditions.

The valve consists of a rigid rectangular steel frame, integral butterfly plate, reinforced valve shaft, sealing assembly and optional actuators including manual, electric and pneumatic types. The entire frame is fabricated from high-quality carbon steel or galvanized steel with precise welding and anti-deformation treatment, ensuring structural rigidity under positive and negative wind pressure. The flat rectangular disc rotates within a 90-degree range to change the airflow cross-section. When fully open, the plate is parallel to the airflow, achieving minimum pressure drop and smooth ventilation. When fully closed, the disc closely fits the frame sealing surface to effectively block air passage and reduce air leakage. The overall structure is compact and flat, requiring no extra conversion adapters during installation and perfectly fitting rectangular duct layouts.

This rectangular ventilation butterfly valve possesses multiple practical advantages for industrial and building ventilation systems. Its targeted rectangular shape eliminates pipeline transition resistance, making airflow distribution more uniform compared with round valves installed in square ducts. The optimized sealing design provides reliable tightness for ventilation regulation and system isolation. The lightweight welded structure effectively prevents deformation caused by long-term wind pressure impact, ensuring stable operation even in continuous running ventilation systems. In addition, the smooth surface of the valve plate is not easy to accumulate dust, which lowers maintenance frequency and improves long-term operational stability.

Available in multiple driving modes, the valve can fully meet different on-site control requirements. The manual type is simple, economical and suitable for occasional adjustment. The electric version supports remote automatic control, signal feedback and linkage operation, ideal for intelligent ventilation systems. The pneumatic model is applicable to explosion-proof and high-frequency switching working conditions. All versions feature flexible opening and closing, accurate airflow adjustment and consistent pressure balance performance.

With a complete range of sizes, the rectangular ventilation butterfly valve is widely used in commercial building central air conditioning systems, factory workshop ventilation and exhaust pipelines, underground garage ventilation, industrial dust removal systems, light-duty flue gas ducts and environmental protection exhaust systems. As a professional and cost-effective duct control component specially designed for rectangular pipelines, it has become a standard and essential product in modern ventilation and air conditioning engineering.