Main Classifications
1. By Sealing Type
• Ordinary Ventilation Butterfly Valve: Metal-to-metal, with a certain leakage rate, high temperature resistant, suitable for flue gas, hot air, and dust.
• Soft-Seal Ventilation Butterfly Valve: With rubber/PTFE seal, good sealing performance, not resistant to high temperatures, mostly used for normal temperature ventilation.
2. By Structure
• Louvered (Multi-Leaf) Ventilation Butterfly Valve: Used for large diameters, smoother opening and closing, commonly used in chimneys and large air ducts.
• Single-Plate (Single-Leaf) Ventilation Butterfly Valve: Small to medium diameters, simplest structure, lowest cost.
Applicable Operating Conditions
• Media: Flue gas, air, hot air, exhaust gas, dust-laden gas, coal gas
• Pressure: Generally PN0.1～PN0.6MPa (low pressure)
• Temperature:
◦ Standard type: ≤300℃
◦ High temperature type: Up to 600℃ or higher
• Diameter: DN100～DN4000
Product Advantages
• Extremely low price, much cheaper than industrial butterfly valves of the same diameter
• Lightweight and easy to install
• Large diameters are possible
• Not prone to jamming, resistant to dust and particles
• Fast opening and closing, suitable for frequent switching
Typical Applications
• Steel plants, metallurgy: Blast furnace flue gas, hot air ducts
• Cement plants, mines: Dust removal ducts, flues
• Power plants: Boiler flue gas systems
• Environmental protection equipment: Desulfurization and denitrification, waste gas treatment
• HVAC, factories: Large ventilation and exhaust systems
