Product Introduction:

Ventilation butterfly valves (duct butterfly valves, flue gas butterfly valves) are center-line welded butterfly valves, specifically designed for low-pressure, high-flow gas pipelines. 

They achieve duct opening/closing, airflow regulation, and pressure balancing through 0°~90° rotation of the butterfly plate.

They are mainly used in gas pipelines carrying dust-laden cold air, hot air, flue gas, exhaust gas, and air.

And are core control equipment in dust removal systems, industrial kilns, environmental protection waste gas systems, HVAC systems, and metallurgical mining pipelines.

Advantages:

1. Extremely low flow resistance, energy saving and consumption reduction: 

The fully open state is close to a straight flow path, resulting in minimal air pressure loss and significantly reduced fan energy consumption, 

suitable for continuous ventilation with high air volume.

2. Lightweight structure, easy installation: 

The short welded valve body is much lighter than gate valves and globe valves; it supports horizontal/vertical installation and is not limited by the direction of media flow.

3. Dust resistant and high temperature resistant: 

The metal hard-seal structure is resistant to dust erosion and can adapt to high-temperature flue gas; it is not prone to dust accumulation and is less likely to jam during long-term operation.

4. Quick opening and closing, low torque: 

The switch is completed with a 90° rotation, making operation easy; it can be frequently adjusted, serving both as a shut-off valve and a flow regulator.

5. High degree of customization: 

Diameter, material, drive method, temperature resistance, and anti-corrosion coating can all be customized as needed; large diameters up to DN6000 are available.

Main application industries: 

Environmental dust removal, waste gas treatment, waste incineration flue gas ducts. 

Cement and building material kiln ventilation systems. 

Metallurgical and steel blast furnaces, sintering flue gas ducts. 

Power plant flue gas ducts, desulfurization and denitrification pipelines. 

Mine ventilation, HVAC, building ventilation ducts. 

Chemical waste gas and coal gas transmission pipelines.

Technical Parameters:

Nominal Diameter: DN100～DN6000

Nominal Pressure: PN0.1MPa, PN0.25MPa, PN0.6MPa

Applicable Media: Air, hot air, flue gas, dusty gas, exhaust gas, coal gas, and other non-corrosive gases

Operating Temperature:

Carbon Steel WCB/Q235: -20℃～400℃.

304 Stainless Steel: -40℃～600℃.

310S High Temperature Resistant Stainless Steel: Up to 850~1000℃.

Body Material: Q235 Carbon Steel, WCB, 304, 316L, 310S.

Disc Material: Same as valve body material, wear-resistant layer can be welded on.

Sealing Type:

No Seal (Ordinary ventilation and regulation, low cost).

Metal Hard Seal (High temperature flue gas, dusty conditions).

Soft Seal (Normal temperature clean air, low leakage requirements).

All valves are equipped with professional export protective packaging. 

With protective caps on the sealing surfaces, rust-proof treatment, and shock-absorbing material filling to ensure intact transport; the loading is secure and safe. 

We can also customize packaging according to customer requirements.

Regarding transportation methods, we can provide appropriate transportation options based on the cargo requirements and the customer's timeliness requirements. 

Common transportation methods include: sea freight, air freight, land freight, and express delivery.