Double Eccentric Butterfly Dampers
Double Eccentric Butterfly Dampers – Series 2000
SUDE Engineering Pvt. Ltd. is a leading Indian manufacturer of Double Eccentric Butterfly Dampers, engineered for reliable shut-off, precise flow regulation, and long service life in demanding industrial applications.
The Double Eccentric (Double Offset) design incorporates an offset shaft and disc arrangement, ensuring that the sealing ring remains completely unstressed in the open position. During operation, the disc disengages from the seat with minimal rotation, eliminating friction between the sealing surfaces. This results in reduced operating torque, minimized wear, and extended seal life compared to conventional butterfly dampers.
In the closed position, the disc is positioned perpendicular to the flow direction, providing tight shut-off in both directions. The sealing is achieved through a specially designed elastic profile seal ring, securely fixed with a stainless steel retaining ring, ensuring reliable and consistent sealing performance.
SUDE Series 20000 Dampers are lightweight, compact, and cost-effective, offering superior performance in both on/off and modulating applications. Designed with fabricated construction and precision engineering, these dampers ensure zero body leakage and zero stem leakage, making them ideal for critical applications requiring tight shut-off.
Available with Electric, Pneumatic, Hydraulic, or Manual actuation, these dampers provide a complete and flexible flow control solution tailored to modern industrial requirements.
Technical Specifications
Parameter
Shape Available Round
Round
Shape Available
150 mm to 4000 mm
Flow Media
Flow Media Air, Flue Gas, and Process Gases
Design Type
Double Eccentric (Double Offset)
Sealing Efficiency
Tight Shut-Off (Zero Leakage Option Available)
Sealing Type
Elastic Profile Seal Ring with SS Retaining Ring
Temperature Range
-30°C to +300°C
Pressure Rating
Pressure Rating PN 1, PN 2.5, PN 6, PN 10, PN 16, PN 25
Material of Construction
Material of Construction IS 2062 / ASTM A36, IS 2002 / ASTM A516 Gr-70, SS304/316, Inconel 625, Hastelloy C276/C22, etc.
End Connections
Flanged / Weldable / Wafer Type
Drive Operations
Manual / Electric / Pneumatic / Hydraulic
Leakage Class
Tight Shut-Off (As per API)
Testing Standards
Testing Standards ISO, AWWA
Design Standards
ANSI B16.5, ANSI B16.10, EN 558, ASME Sections II, III, V, VIII, IX, AMCA-500D
Working Principle:
Open Position
Disc remains offset from the seat — no contact, ensuring zero friction and minimal wear.
Modulating / Throttling
Disc rotates gradually (0°–90°) — precise control of airflow or gas flow with low torque requirement.
Closed Position
Disc becomes perpendicular to flow — elastic seal ring presses against conical seat ensuring tight, bidirectional sealing.
Actuation Options:
Manual
Lever or Gear Operated
Electric
Motorized automated control
Pneumatic
Fast and efficient air-actuated operation
Hydraulic
Suitable for high torque and large-size dampers
Key Features & Advantages
- Double eccentric design ensures low friction and long seal life
- Low operating torque leading to cost-effective actuation
- Zero body and stem leakage for critical applications
- Suitable for bidirectional flow sealing
- Compact, lightweight, and fabricated construction
- Replaceable seals and discs for easy maintenance
- Available for on-off, regulating, and inching duty
Why Choose ?
- Proven expertise in customized damper manufacturing
- Advanced fabrication and in-house quality testing facilities
- Specialized in low torque and tight shut-off designs
- Advanced fabrication and in-house quality testing facilities
- Specialized in low torque and tight shut-off designs
- Strong technical support and project execution capabilities
SUDE Double Eccentric Butterfly Dampers Advantage:
At SUDE Engineering Pvt Ltd., we integrate advanced engineering design with precision manufacturing to deliver high-performance Double Eccentric Dampers that ensure durability, efficiency, and reliability.
Our innovative cam-action mechanism reduces operational effort while enhancing sealing performance. Each damper is designed with replaceable components for easy maintenance and tested for leakage, strength, and endurance before dispatch.
When combined with SDTORK Electric or Pneumatic Actuators, SUDE Double Eccentric Dampers provide a smart, automated, and efficient solution for modern industrial flow control systems.
Applications
Thermal & Nuclear Power Plants
Steel & Cement Industries
Oil & Gas Industries
Pharmaceutical Industries
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