Double Eccentric Butterfly Valves

W‌hat is Double Eccentric Butterfly Valve

Double eccentric butterfly valve is an industrial valve with double eccentric structure design. It can quickly disengage from the sealing surface through the valve shaft structure with two offsets, and has both fluid regulation and cutoff functions. Its core features are high pressure resistance, low wear, long life and high sealing performance. It is widely used in many fields such as urban water supply and drainage, metallurgy, and chemical industry. ‌‌

Detail of Double Eccentric Butterfly Valves

Valves Information

Size: NPS 1-1/2 Inch to NPS 80 Inch (DN40 to DN2000)

Pressure Range: Class 150lb, Class 300, Class 600.

End Connection: Wafer, Flange, Lug.

Actuator: Lever, Gear Box, Pneumatic Actuator, Electric Actuator, Hydraulic Actuator

Material: Ductile Iron, WCB, Stainless Steel, Duplex Stainless Stee, CF8, CF8M, CF3, CF3M, C95800, 4A, 5A, etc.

Standards

‌Definition and structural characteristics‌

‌Double eccentric design‌:

The valve shaft center deviates from the butterfly plate center and the valve body channel center at the same time (i.e. “two offsets”), so that the butterfly plate can quickly disengage from the sealing surface when opening, reducing friction and wear. ‌‌‌‌‌

‌Sealing optimization‌:

The sealing surface is usually made of stainless steel surfacing or silicone rubber material, combined with a double sealing ring design, which effectively solves the problem of shaft hole leakage, and the leakage rate can be controlled at a level close to zero. ‌‌

‌Core advantages‌

‌High pressure resistance and long life‌:

Compared with the centerline butterfly valve, the double eccentric structure significantly improves the pressure resistance (nominal pressure can reach Class 300), and the metal valve seat design supports high temperature environment applications (up to 425°C). ‌‌‌‌

‌Low operating resistance‌:

The double eccentric structure reduces the opening torque, making operation easier and reducing the failure rate by more than 30%. ‌‌

‌Multi-scenario adaptation‌:

Supports manual, worm gear, pneumatic, and electric drive modes, and is suitable for media including water, oil, gas, and corrosive liquids. ‌‌

‌Comparison of application fields‌

NSW Valve Manufacturer is leader of China Butterfly Valves Factories, our butterfly valves include Double eccentric butterfly valve, triple offset eccentric butterfly valves, high performance butterfly valves, and rubber seat butterfly valves. If you need detail technical data please contact us.

Double Eccentric Butterfly Valve: Engineered Precision for Demanding Flow Control

Optimize pipeline performance and reliability with our advanced Double Eccentric Butterfly Valve. Manufactured with precision engineering and stringent quality control, this valve represents the ideal solution for industries requiring efficient, low-maintenance, and bubble-tight shut-off.

Core Innovation: The Double Offset Advantage

Unlike standard butterfly valves, our design incorporates two distinct eccentricities (offsets):

1. Stem Offset Behind the Disc Centerline: Reduces friction during operation.
2. Stem Axis Offset from the Pipe/Seat Center: Creates a unique camming action.
   This double-offset principle ensures the disc lifts completely clear of the resilient seat seal the moment operation begins. The result?

• Dramatically Reduced Seat Wear: Minimizes abrasive contact, extending valve life significantly.
• Ultra-Low Operating Torque: Enables smooth actuation with smaller, more economical gearboxes, pneumatic actuators, or electric actuators.
• Reliable Bubble-Tight Sealing: Achieves exceptional shut-off integrity against liquids and gases in both flow directions.
• Minimized Maintenance: Robust design translates to lower lifecycle costs.

Engineered for Performance & Durability:

• Robust Construction: Available in premium materials including Ductile Iron (GGG40/50), Carbon Steel (WCB, LCC), Stainless Steel (CF8/CF8M), and specialized alloys to withstand demanding pressures (PN10/16/25, Class 150/300) and corrosive environments.
• Superior Sealing: Features high-performance resilient seats (EPDM, NBR, Viton® options) or optional metal seats for extreme temperatures/abrasive media.
• Precision Machining: Ensures optimal fit, smooth operation, and consistent sealing performance cycle after cycle.
• Compact & Lightweight: Offers significant space and weight savings over gate or globe valves, simplifying installation and support requirements.
• Global Standards Compliance: Manufactured to meet or exceed API 609, EN 593, ISO 5752, and ISO 5211 specifications.

Your Trusted Source from China:

As a leading China-based manufacturer and global supplier, we combine cutting-edge production technology with rigorous quality assurance. We deliver high-performance double eccentric butterfly valves that meet the most stringent international requirements.

Why Partner With Us?

• Direct Manufacturer Pricing: Competitive value without compromising quality.
• Customization Expertise: Tailor materials, sizes (DN50 – DN1200+), end connections (flanged, wafer, lug), and actuation to your exact needs.
• Consistent Quality: Stringent process controls ensure reliable, batch-to-batch consistency.
• Global Supply Chain: Efficient logistics ensure reliable delivery worldwide.
• Technical Support: Expert guidance for selection, application, and integration.

Ideal Applications:

• Water & Wastewater Treatment Plants
• Power Generation (Cooling Water, Fuel Systems)
• HVAC & District Heating/Cooling
• Oil & Gas (Refining, Pipelines – moderate services)
• Chemical & Petrochemical Processing
• Marine & Offshore Systems
• Pulp & Paper Industry
• General Industrial Process Lines

Experience the difference precision engineering makes. Contact us, your dedicated China manufacturer and supplier, for your Double Eccentric Butterfly Valve requirements and discover a smarter solution for critical flow control.

Newsway Valves Materials

The China Valve Manufacturer from China, its valves body and trim material can be offered in Forged type and Casting type. Next to Stainless Steel and Carbon Steel material, we also manufacture valves in special materials such as titanium, nickel alloys, HASTELLOY®*, INCOLOY®, MONEL®, Alloy 20, super-duplex, corrosion resistant alloys and urea grade materials.

Available Valve Materials