Double Offset Butterfly Valve

When compared to a concentric butterfly valve, a double-offset butterfly valve has two offsets.

We are leading Double Offset Butterfly Valve Manufacturer in Mumbai, India. The first offset is the shaft, which is not at the centre of the disc but slightly behind it. Because of this misalignment, the valve will have a continuous sealing surface on the disc.

The second offset is the shaft, which is not in the centre of the pipe but slightly to the right of it. When the valve is fully opened, this offset ensures that it does not come into contact with the seat (see illustration above). This configuration causes less friction in the seat than the concentric type butterfly valve, extending its life. In a typical application, this double-offset butterfly valve is only available in class 600.

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Specifications

Features

End Connection: Flange (B16.5) / Lug Type / Wafer Type

Size: 15 NB - 600 NB

Class: 150# - 600#

Temperature Range: -190° C to 350 ° C

MOC: Carbon Steel / Stainless Steel / Alloy

Design Standard: EN 593 (BS 5155), API 609, MSS SP-67

Seat: Soft Seat ( Nitrile Rubber, EPDM ), Viton / Metal Seat

Face to Face: API 609 CAT A / MSS SP-67 (Narrow Body), ISO 5752 (Short)

Operation: Manual / Actuator / Gear

Safety : BS/EN 10204-3.1 REV 2019API 607, API 598 Rev 2009

  • Precise Flow Control: Offers accurate flow regulation for enhanced system performance.
  • Bubble-Tight Sealing: Ensures leak-free operation under high-pressure conditions.
  • Low Torque Operation: Requires minimal torque for smooth valve operation.
  • Wide Temperature Range: Suitable for various temperature conditions.
  • Corrosion Resistance: Constructed from corrosion-resistant materials for durability.
  • Reduced Friction: Minimizes friction between disc and seat for improved longevity.
  • Versatile Design and Installation: Provides tight sealing in both directions for installation flexibility, with ISO mounting pad for actuator installation.

Related Products

Concentric Design Butterfly Valve Manufacturer in Mumbai, India

Types:  Concentric Design Single/ Lug Type / Wafer / Double Flange

Mfg. Std. : API 609 / EN 593 / MSS SP 67 / ISO 5752

End Connection : Flange / Buttweld/ Lug/ Wafer Type

Size: 50NB - 600NB 

Class: #150- #600

Types:   Signle Offset 

Mfg. Std. : API 609 / EN 593 / MSS SP 67 / ISO 5752

End Connection : Flange / Buttweld/ Lug/ Wafer Type

Size: 50NB - 600NB  

Class: 150# - 600#

Types: Concentric Single / Double Offset /Lug & Wafer Type

Mfg. Std.: API 609 / EN 593 / MSS SP 67 / ISO 5752

Lining Material : PTFE | PFA  | FEP | ETFE | PVDF

Size: 50NB-600NB 

Class: #150 - #600

FAQ’s

Have a question before you buy our products? Take a look at the FAQs below.
If you don’t find the answer you’re looking for, get in touch with us here.

  • What is a Double Offset Butterfly Valve?

    A Double Offset Butterfly Valve is a type of valve used to control fluid flow in pipelines. It features two offset shafts: one offset from the centerline of the disc and the other offset from the centerline of the valve body.

  • How does it work?

    The valve operates by rotating a disc 90 degrees to control the flow of fluid. The double offset design allows the disc to move away from the seat with a cam-like action, providing a tight seal.

  • What are the main applications?

    Main applications include water and wastewater treatment, HVAC systems, chemical processing, oil and gas, and power generation industries where precise flow control and tight shut-off are required.

  • What are the benefits of using one?

    The benefits of using a Concentric Double Offset Butterfly Valve include:

    1. Excellent Sealing Performance: Provides tight shut-off capabilities, minimizing leakage.
    2. Reduced Friction and Wear: Streamlined flow path reduces friction and wear, extending the valve's service life.
    3. Precise Flow Control: Offers accurate and reliable flow control in various industrial applications.
    4. Versatility: Suitable for a wide range of fluids, including water, steam, gas, and corrosive chemicals.
    5. Compact Design: Space-saving design allows for easy installation and integration into existing piping systems.
  • What materials are used in their construction?

    Concentric Double Offset Butterfly Valves are commonly constructed from materials such as stainless steel, carbon steel, ductile iron, and various alloys. Sealing materials include EPDM, NBR, Viton, and PTFE, depending on the application requirements.

  • How do I choose the right one for my application?

    Choose based on factors such as the type of fluid, pressure rating, temperature range, valve size, end connections, and compatibility with specific application requirements to ensure optimal performance.

  • Can they be repaired?

    Yes, Concentric Double Offset Butterfly Valves can be repaired. Common repairs may include replacing seals, bearings, or other components to restore the valve's functionality.

  • What maintenance is required?

    Regular maintenance includes inspection, cleaning, and lubrication of moving parts to ensure smooth operation and prevent corrosion or damage.

  • Are they available in different designs?

    Yes, Concentric Double Offset Butterfly Valves are available in various designs, including different sizes, end connections, and actuation methods to meet diverse application needs.

  • Why is Freture the best place to buy from?

    Freture is the preferred choice for purchasing Concentric Double Offset Butterfly Valves due to our commitment to quality, extensive industry experience, and dedication to customer satisfaction. Our valves are reliable, competitively priced, and tailored to meet the specific needs of your applications.

Industries where Double Offset Butterfly Valves is Used

Wastewater Treatment
HVAC Industry
Chemical Processing
Oil and Gas Industry
 

Power Generation

Applications of Double Offset Butterfly Valve
  • Flow Control: Precise control of fluid flow in various industries.
  • Isolation: Reliable shutoff in critical applications.
  • High-Temperature Services: Handling extreme temperature fluids or environments.
  • Abrasive Media Handling: Suitable for handling abrasive materials.
  • Emergency Shutdown Systems: Integrated for rapid and effective isolation during emergencies.
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