Butterfly Damper for Sale
Darko is a key supplier for industrial ventilation and flue gas systems. Our industrial dampers are essential for airflow control in dust collectors, boiler stacks, material conveying, and process ventilation. We offer butterfly, louvre, and isolation dampers in carbon steel, stainless steel, or weathering steel, with custom airtight, regulating, or wear-resistant designs tailored to your system’s pressure, temperature, and media.
- Round or rectangular design
- Fully welded body
- Specially engineered compact design
- On/off or modulating
- Typical range from DN300 to DN3000 (other sizes available on request)
- Minimal leakage through robust design and manufacturing
- Available with pneumatic, electric, hydraulic or manual actuator
Butterfly Damper by Temperature
Temp: ≤ 120°C
Desc: Cost-effective carbon steel body with EPDM/NBR seals for airtight ventilation & HVAC systems.
Apps: General plant ventilation, HVAC ducts, ambient air handling.
Temp: 120°C ~ 450°C
Desc: Stainless steel damper with heat-resistant silicone seals. Designed for boiler flue gas & hot air processes.
Apps: Boiler secondary air, industrial oven exhaust, process ducts.
Temp: 450°C ~ 700°C
Desc: Built with 310S stainless or alloys, featuring graphite/metal seals & optional shaft cooling for high-temp flue gas.
Apps: Gas turbine exhaust, incinerator flue, heat treatment furnaces.
Temp: 700°C ~ 1200°C
Desc: Engineered with water-cooled jackets, refractory lining, or full alloy casting for extreme heat. Uses full metal seals.
Apps: Cement kiln gas, waste-to-energy incinerators, steel plant sinter off-gas, glass melter flues.
Butterfly Damper Actuation Options
Selecting the right actuation method is crucial for efficient and reliable airflow control. We provide a complete suite of solutions, from intelligent regulation to extreme torque applications.
Smart & Precise Control. Integrates with Building Automation Systems for remote/automatic operation. Supports 4-20mA feedback and bus communication.
Simple, Economical & Reliable. Available as Lever Handle or Worm Gear type. Gear operation provides self-locking for stable positioning of large dampers.
Fast Acting & Explosion-Proof. Ideal for applications requiring quick shut-off or in hazardous areas. Double-acting/Single-acting cylinders available, can be fitted with positioners for proportional control.
Extreme Torque in Compact Design. Excels in space-restricted layouts or ultra-high torque applications, ideal for heavy industries like power generation and metallurgy.
What is a Butterfly Damper?
A Butterfly Damper is a mechanical device installed inside ducts, stacks, or air handling systems to regulate, isolate, or divert the flow of air, gases, or particulate-laden streams. It is a fundamental component for airflow control in industrial and commercial ventilation systems.
Low flow resistance coefficient <0.2
A butterfly damper with a flow resistance coefficient of 0.2 can reduce energy consumption by over 25%. This is especially suitable for large flow pipelines (such as DN3000 ventilation systems), where the energy-saving effect is significant over long-term operation.
Hard seal
The stainless steel valve seat and the welded cobalt-based hard alloy butterfly plate have a hardness of over HRC 60. They achieve a rigid sealing surface through precise processing.
0° - 90° Rotation Adjustment
The damper is installed along the diameter direction of the pipeline. Under the drive of the valve stem, it rotates around the axis from 0° (fully closed) to 90° (fully open). During the rotation process, the cross-sectional area of the flow passage changes linearly to achieve flow regulation.
Why 10,000+ Customers Choose Us
Darko understands the needs of our customers, so each butterfly damper is rigorously tested to ensure long-term stable operation. At the same time, we provide customized services to tailor the most suitable butterfly dampers to meet the challenges of different industrial environments according to your specific needs. Whether it’s technical support, after-sales service, or product delivery cycle, we always focus on our customers and provide a full range of protection for your project to ensure that every aspect is worry-free. By choosing us, you will enjoy industry-leading innovative technology and professional support.
Our Core Advantages
1. Superior Airtightness & Low Leakage Rate
For dust collection system offline cleaning or isolation requirements, our airtight dampers feature elastic seal or knife-edge seal designs, ensuring minimal leakage to maintain system operational efficiency and safety.
2. Abrasion & Corrosion Resistant Design
For high-dust or corrosive flue gas environments, we offer wear-resistant liners or acid-resistant coating options, significantly extending damper service life in harsh conditions while reducing maintenance costs.
3. Stable Operation Capability for Large Sizes
We specialize in manufacturing large-diameter dampers from DN500 to DN3000 and above. Through reinforced rib design and heavy-duty bearing support, we ensure stable operation without deformation or jamming, with smooth actuation torque even for oversized units.
4. Flexible Actuation & Intelligent Control
Supports manual, pneumatic, and electric actuation methods. Can be integrated with position feedback switches and easily connected to PLC or DCS systems for automated centralized control, meeting modern plant intelligence requirements.
5. Rapid Delivery & Expert Selection Support
With mature design modules and manufacturing processes, we ensure quick delivery for standard products. Our engineers provide complimentary selection calculations to guarantee optimal damper size and type for your specific system requirements.
Typical Applications For Butterfly Dampers
Butterfly dampers are essential for precise airflow control across various industries. Explore our solutions for your specific application below.
1. Dust Collection & Filtration Systems
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Key Role: Isolation, Diversion & Regulation. Critical for system efficiency and safety.
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Specific Uses:
- Offline Cleaning Valves: Isolate individual filter modules for maintenance without shutting down the entire system.
- Bypass Dampers: Divert airflow during emergency or maintenance scenarios.
- Inlet/Outlet Dampers: Regulate airflow into and out of baghouses, cartridge collectors, and cyclones.
2. Power Generation & Boiler Plants
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Key Role: Air & Flue Gas Management. Ensure operational stability and environmental compliance.
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Specific Uses:
- Secondary Air Dampers: Control combustion air supply to boilers for optimal efficiency.
- Flue Gas Recirculation Dampers: Manage NOx emissions and boiler temperature.
- FD/ID Fan Inlet/Outlet Dampers: Isolate fans for maintenance and regulate draft.
3. Cement, Steel & Heavy Process Industries
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Key Role: High-Temperature & Abrasive Gas Handling. Built to withstand extreme conditions.
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Specific Uses:
- Kiln Inlet/Outlet Dampers: Control airflow in cement and lime kilns.
- Sinter Plant Off-Gas Dampers: Handle hot, abrasive gases in steel plants.
- Fume & Exhaust Control: Manage emissions from furnaces and process heaters.
4. HVAC & Building Automation
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Key Role: Airflow Balancing & Zone Control. Ensure comfort, efficiency, and smoke management.
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Specific Uses:
- VAV System Dampers: Modulate airflow to different building zones.
- Smoke Control Dampers: Isolate fire zones as part of life safety systems.
- Fresh Air & Exhaust Dampers: Regulate building pressurization and air quality.
5. Material Handling & Conveying
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Key Role: Diversion & Shut-off in Pneumatic Systems. Reliable operation for bulk material transport.
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Specific Uses:
- Divertor Dampers: Route powdered or granular materials between different lines.
- Line Isolation Dampers: Seal off sections of pneumatic conveying systems for maintenance.
Butterfly damper application cases
The DN800-DN2000 specification butterfly dampers are used for the exhaust gas pipeline at the end of the kiln, with a 304 stainless steel valve body and a hard alloy sealing surface. They can withstand working conditions with a dust concentration of ≤ 50g/Nm³, and the leakage level reaches ANSI Class V.
The import and export are equipped with pneumatic butterfly dampers with diameters ranging from DN500 to DN800. The working pressure is 0.6 – 1.0 MPa, and the temperature resistance is ≤ 120℃. They are used to regulate the material flow. The damper is designed with a flow guiding groove to prevent material accumulation, and it is suitable for the production line of 5,000 tons of cement per day.
We choose Ex dⅡBT4 pneumatic actuators. And the butterfly damper material is aluminum alloy or 316L stainless steel.
The butterfly damper controls the opening degree of the discharge gate, increasing the out-cargo efficiency by 40%.
Explore Specifications and Models of Butterfly Dampers
- Company Production Process
- Technical Specifications
- Butterfly Damper Drawing
- Datasheet
- Pressure: Typically 50Kpa (0.5 barG) however we can design for higher on request
- Temperature: Typically 600°C (1112°F) up to 1250°C (2282°F) on request
- Materials: Carbon steel or stainless steel as standard, with optional chrome moly or higher specification alloys for extreme temperatures or corrosive environments
| DN | D | D1 | B | b | n-d | E | L1 | L2 |
| 100 | 200 | 155 | 180 | 10 | 4-φ14 | 855 | 450 | 620 |
| 150 | 250 | 205 | 180 | 10 | 8-φ14 | 905 | 450 | 620 |
| 200 | 300 | 255 | 180 | 10 | 8-φ14 | 965 | 450 | 620 |
| 250 | 350 | 305 | 180 | 10 | 12-φ14 | 1015 | 450 | 620 |
| 300 | 400 | 355 | 180 | 10 | 12-φ14 | 1085 | 450 | 620 |
| 350 | 450 | 405 | 180 | 10 | 16-φ14 | 1135 | 450 | 620 |
| 400 | 520 | 465 | 200 | 12 | 16-φ18 | 1385 | 500 | 650 |
| 450 | 570 | 515 | 200 | 12 | 16-φ18 | 1440 | 500 | 650 |
| 500 | 620 | 565 | 200 | 12 | 20-φ18 | 1486 | 500 | 650 |
| 600 | 720 | 665 | 200 | 12 | 20-φ18 | 1596 | 500 | 650 |
| 700 | 820 | 765 | 220 | 12 | 20-φ18 | 1780 | 600 | 700 |
| 800 | 920 | 865 | 220 | 12 | 24-φ18 | 1895 | 600 | 700 |
| 900 | 1020 | 965 | 220 | 12 | 24-φ18 | 1995 | 600 | 700 |
| 1000 | 1130 | 1070 | 260 | 16 | 28-φ22 | 2255 | 620 | 780 |
| 1100 | 1230 | 1170 | 260 | 16 | 28-φ22 | 2355 | 620 | 780 |
| 1200 | 1330 | 1270 | 260 | 16 | 28-φ22 | 2455 | 620 | 780 |
| 1300 | 1430 | 1370 | 300 | 16 | 32-φ22 | 2555 | 620 | 820 |
| 1400 | 1530 | 1470 | 300 | 16 | 36-φ22 | 2655 | 620 | 820 |
| 1500 | 1630 | 1570 | 300 | 16 | 36-φ22 | 2770 | 620 | 820 |
| 1600 | 1730 | 1670 | 300 | 16 | 40-φ22 | 2870 | 620 | 820 |
| 1700 | 1830 | 1770 | 340 | 20 | 40-φ22 | 3110 | 650 | 900 |
| 1800 | 1930 | 1870 | 340 | 20 | 44-φ22 | 3210 | 650 | 900 |
| 1900 | 2030 | 1970 | 340 | 20 | 44-φ22 | 3310 | 650 | 900 |
| 2000 | 2130 | 2070 | 340 | 20 | 48-φ22 | 3410 | 650 | 900 |
| 2100 | 2230 | 2170 | 340 | 20 | 48-φ22 | 3525 | 650 | 900 |
| 2200 | 2330 | 2270 | 340 | 20 | 48-φ22 | 3625 | 650 | 900 |
| 2300 | 2430 | 2370 | 380 | 20 | 48-φ22 | 3805 | 650 | 1000 |
| 2400 | 2530 | 2470 | 380 | 20 | 48-φ22 | 3905 | 650 | 1000 |
| 2500 | 2630 | 2570 | 380 | 20 | 52-φ22 | 4005 | 650 | 1000 |
| 2600 | 2730 | 2670 | 380 | 20 | 52-φ22 | 4105 | 650 | 1000 |
| 2700 | 2860 | 2785 | 420 | 24 | 56-φ26 | 4210 | 750 | 1350 |
| 2800 | 2960 | 2885 | 420 | 24 | 60-φ26 | 4310 | 750 | 1350 |
| 2900 | 3060 | 2985 | 420 | 24 | 60-φ26 | 4410 | 750 | 1350 |
| 3000 | 3160 | 3085 | 420 | 24 | 60-φ26 | 4510 | 750 | 1350 |
More Q&A about Butterfly Dampers
If you have any other question not listed in FAQs, please don’t hesitate to contact us; our team will reach out to you very soon and give you personal help to answer your inquiry.
For the most accurate quote please provide the following information:
- Type or style of damper. For example: butterfly, louver, Tee, diverter, etc.
- Preferred material, such as stainless steel, carbon steel, other
- Pressure requirement
- Temperature the damper will be exposed to
- Air flow amount
- Manual, pneumatic or electric a
- ctuation/positioner requiredAmount of shut off needed (usually in %)
Key Differences in Application: Confined vs. Expansive Environments. The core distinction lies in the medium controlled: butterfly valves handle fluids within confined piping, while butterfly dampers manage air in expansive ducting. This translates to differences in pressure containment and operational requirements.
- The butterfly damper can be opened and closed quickly, making it suitable for applications that require frequent flow adjustments.
- The butterfly damper has a compact structure, making it ideal for installation in space-constrained environments.
- It can withstand the impact of abrasive materials such as cement.