Butterfly Valve

1. Overview

The Ventilation Butterfly Valve (Industrial Air Damper) is a dedicated flow control valve for gas, flue gas and ventilation duct systems. Different from material discharge valves such as flap valves and rotary airlock valves, this valve is designed for gas medium regulation and cutoff instead of solid bulk materials. The central disc rotates within the duct cross-section to adjust airflow volume, wind pressure and pipeline on-off state. With thin-walled streamlined structure, it brings minimal flow resistance, solves wind volume imbalance and flue gas leakage problems in ventilation pipelines, and is the core matching component for dust removal, industrial ventilation and flue gas treatment systems.

2. Working Principle

The valve body is flange-connected or welded into the circular/rectangular ventilation duct. The driving actuator drives the central valve disc to rotate 0°~90° around the central shaft. When the disc is parallel to the pipeline, the duct is fully open with minimum wind resistance; when rotated to 90°, the disc completely blocks the duct to cut off airflow. By adjusting the rotation angle, the effective ventilation area is changed to realize stepless regulation of air volume and flue gas flow. The shaft end adopts multi-layer sealing structure to prevent external air leakage and internal flue gas overflow.

3. Core Features & Advantages

- Low Flow Resistance Streamline disc design produces negligible wind resistance, saving fan operating power and energy consumption.

- Precise Air Volume Regulation 0-90° stepless angle adjustment for accurate airflow, wind pressure and flue gas flow control.

- High Temperature & Corrosion Resistance Carbon steel, stainless steel and high-temperature alloy options adapt to 450°C flue gas and corrosive exhaust gas.

- Diversified Driving Modes Manual handle, electric actuator, pneumatic drive and hydraulic drive for local and automatic remote control.

- Zero Leakage Sealing Metal hard seal or flexible soft seal optional, effectively preventing duct air leakage and system pressure loss.

- Lightweight & Easy Installation Simple disc structure, lighter than gate valves, supports flange connection and direct welding installation.

- Duct Shape Customizable Available in round and rectangular shapes to match standard industrial ventilation duct dimensions.

4. Main Technical Specifications

5. Application Industries

- Dust Removal System Branch duct airflow adjustment, single dust collector independent wind cutoff control

- Thermal Power Plant Boiler flue gas duct regulation, primary & secondary air volume balance control

- Cement Industry Kiln tail flue gas ventilation, raw material workshop dust exhaust duct damper

- Mining & Metallurgy Underground ventilation, smelting high-temperature exhaust gas regulation

- Industrial HVAC & Environmental Protection Factory ventilation, waste gas treatment pipeline flow control

6. Customization Service

We provide customized ventilation butterfly valve solutions. Customizable options include round/rectangular duct size, high-temperature resistant disc assembly, stainless steel anti-corrosion body, explosion-proof electric actuator, remote signal feedback device and special leakage grade sealing. All valves undergo air tightness and angle debugging testing before delivery, with professional installation guidance, on-site commissioning and lifelong after-sales technical support.