‌Large Diameter Pneumatic Airflow Butterfly Valve‌ is a non-sealed rotary butterfly valve used in ventilation ducts, primarily for flow regulation or on/off control of gas media. Its design features a new structural form with a mid-line disc plate and short structural steel plate welding, offering compact structure, light weight, easy installation, low flow resistance, and high flow capacity. It is particularly suitable for use in high-temperature environments.

Structural Features

‌Innovative Design: Utilizes a center-line disk plate and short-structured steel plate welding structure, offering rational design, light weight, and quick opening and closing.‌

‌No Linkage, Bolt‌: Internally, there are no linkages or bolts, ensuring reliable operation and a long service life. Suitable for multi-position installation, unaffected by medium flow direction.

Low flow resistance, high flow rate: with minimal channel resistance and a high flow coefficient, it is particularly suitable for large diameter, high flow applications.

Application Scenario

Large-diameter pneumatic butterfly valves are widely used in the production processes of building materials, metallurgy, mining, and power industries. They are suitable for pipelines with medium temperatures ≤300°C and nominal pressure of 0.1Mpa, where they are used for connecting, opening, or regulating the flow of media. Additionally, they are particularly suitable for controlling large-diameter, high-flow boiler flue gas and environmental protection dust removal systems.

Performance Parameters

Nominal Bore: DN50-2000

Nominal Pressure: 0.05—0.6 MPa

‌Temperature Range: -25℃ to +70℃‌

Materials: Cast Steel, Stainless Steel, etc.

Pros and Cons

‌Advantages:

Simple structure: Composed of a few parts, easy to disassemble and maintain.

‌Operation is light and easy: The power provided by the pneumatic actuator allows the butterfly plate to rotate effortlessly, enabling quick opening or closing.

Good sealing performance: The butterfly plate and valve seat have excellent sealing properties, suitable for various media.

Wide Application Range: Particularly suitable for large-diameter, high-flow boiler kiln flue gas control and environmental protection dust removal systems.

‌Drawbacks:

Sealing surface affected by erosion: Multi-layer soft and hard stacked seals are prone to erosion in their normally open state, impacting sealing performance.