Double Eccentric Butterfly Valve

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Product Description

Double Eccentric Flange Butterfly Valve Overview

Overview

Double eccentric flange butterfly valves are designed to regulate the flow of fluids in pipeline systems. With their unique eccentric structure, they offer improved sealing performance, reduced wear, and ease of operation. These valves are widely used in water treatment, chemical processing, oil and gas, and HVAC systems.

Components and Structure

  1. Body: Typically made of carbon steel, stainless steel, or ductile iron, offering excellent strength and corrosion resistance.

  2. Disc: Manufactured from stainless steel, carbon steel, or alloy materials, depending on application needs, providing high pressure and corrosion resistance.

  3. Stem: Usually made of stainless steel, delivering strength, wear resistance, and reliability.

  4. Seat: Available in soft sealing materials like EPDM, NBR, or PTFE, or metal sealing for high-temperature or high-pressure applications, ensuring tight shut-off.

  5. Actuator: Options include manual handles, gear operators, pneumatic actuators, or electric actuators for flexible operation modes.

Working Principle

The double eccentric design means that the shaft is offset from both the centerline of the valve body and the sealing surface. This design allows the disc to disengage from the seat quickly upon opening, reducing friction and wear. As the valve closes, the disc moves into a wedging position, compressing against the seat to create a tight, reliable seal. Typically operated with a 90° turn, the valve allows quick and efficient flow control.

Advantages

  1. Excellent Sealing Performance: The eccentric mechanism ensures a tighter seal with minimal wear on the sealing surface.

  2. Low Operating Torque: Reduced friction between the disc and seat allows smoother operation and easier automation.

  3. Versatile Applications: Suitable for handling liquids, gases, and corrosive media under medium to low pressure.

  4. Long Service Life: Minimal seat wear extends the valve’s service life and reduces maintenance costs.

  5. Easy Installation and Maintenance: The flange connection allows for quick installation, disassembly, and servicing.

Applications

  • Water Treatment: Used in water supply and wastewater management systems.

  • Chemical Processing: Handles corrosive fluids and chemicals with ease.

  • Oil and Gas: Ideal for flow control in petroleum, natural gas, and related operations.

  • HVAC Systems: Regulates air and water flow in heating, ventilation, and air conditioning systems.

  • Power Plants: Applied in cooling systems and desulfurization processes.

Maintenance

Routine inspection is essential to maintain optimal performance:

  • Check the seat for wear or aging.

  • Lubricate the stem and actuator components regularly.

  • Inspect the disc for scaling, corrosion, or deposits.

  • Ensure actuator operation is smooth and responsive.

The flanged design simplifies disassembly and reassembly, making regular maintenance easier and more efficient.

Summary

Double eccentric flange butterfly valves are a reliable and efficient choice for systems requiring precise flow control and high sealing performance. Their robust design, long life, and adaptability make them a preferred solution across various industries.


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