Double Eccentric Design: The "Offset" Advantage
The Double Eccentric (Double Offset) geometry is engineered to solve the primary weakness of standard butterfly valves: seat wear.
- First Offset: The shaft is located behind the sealing surface.
- Second Offset: The shaft is located slightly to one side of the pipe's vertical centerline.
Why it Matters: The "Camming" Action
This design allows the disc to "cam" into the seat. Upon opening, the disc lifts immediately away from the PTFE seat rather than rubbing against it. This frictionless operation significantly reduces torque and extends the service life of the FEP/PFA sleeve, even during frequent ON/OFF cycles.
Technical Specifications: Model BOD
Feature | Details |
Design Type | Wafer-type Centric Disc (Lined) / Double Offset Geometry |
Body Materials | Cast Iron, Cast Steel, Ductile Iron, CF8, CF8M |
Lining / Sleeve | FEP / PFA (Full encapsulation of wetted parts) |
Disc Materials | Ductile Iron, Cast Steel, CF8, CF8M |
Seat Material | PTFE (Polytetrafluoroethylene) |
Size Range | 4" (100mm) to 48" (1200mm) |
Pressure Rating | PN 10 (Standard); PN 16 (On Request) |
Temperature | Up to 200°C (Depending on MOC and lining) |
Leakage Class | Tight Shut-off (Zero Leakage) |
Advanced Protection for Corrosive Media
The FlowBiz Model BOD is specifically engineered so that the corrosive medium never makes contact with the valve body.
- Full Encapsulation: The FEP/PFA sleeve covers the entire wetted surface of the body and extends over the flange faces, acting as an integrated gasket.
- Low Torque / High Flow: The double eccentric motion ensures that even in large-diameter pipelines (up to 48"), the valve remains easy to operate manually via Lever (Handle) or Worm Gear.
- Chemical Inertness: The PFA/FEP lining is resistant to almost all known chemicals, including concentrated acids, alkalis, and reactive solvents.
Strategic Industrial Applications
1. Chemical & Petrochemical
Ideal for high-volume transfer lines handling corrosive reagents where traditional metal valves would fail within weeks.
2. Pharmaceutical Manufacturing
The non-stick, inert properties of the PTFE seat and PFA sleeve prevent batch contamination and facilitate easy cleaning (CIP).
3. Large-Scale Desalination
In 4" to 48" sizes, these valves are essential for handling high-salinity brine and chemical dosing in reverse osmosis plants.
4. Mining & Slurry Handling
The robust construction and smooth flow path of the "Wafer" design make it excellent for handling abrasive slurries when fitted with reinforced linings.
FlowBiz Exports: State-of-the-Art Engineering
As a leading Lined Butterfly Valve manufacturer in India, FlowBiz Exports delivers precision-engineered solutions to the global market. Whether you are in Mumbai, Vapi, Dahej, or Dubai, our Model BOD is designed for the most extensive pipelines.
- Domestic Excellence: Rapid supply to chemical clusters in Gujarat and Maharashtra.
- Global Footprint: Trusted by engineers in Turkey, Africa, and Southeast Asia.
Is your large-diameter pipeline struggling with frequent seat replacements or chemical corrosion?
Switch to the FlowBiz Model BOD for frictionless, zero-leakage performance. Contact our technical team today at +91 9016 989898 for a detailed quote, CAD drawings, and chemical compatibility assistance.
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