Double Flanged Butterfly Valve
Description
DOUBLE FLANGED BUTTERFLY VALVE
Heavy Duty Industrial Butterfly Valves | PN10 / PN16 / PN25 | DN 50–1200
MNC Valves is a Double Flanged Butterfly Valve Manufacturer in India, manufacturing heavy-duty resilient seated butterfly valves designed for large diameter pipelines, high mechanical stability, and secure flanged installation.
Double flanged butterfly valves are widely used in municipal water systems, power plants, cooling water lines, chemical processing units, and infrastructure projects where structural rigidity and secure bolting are required.
MANUFACTURING STANDARDS
Manufactured in compliance with:
- API 609 – Butterfly Valves
- EN 593 – Industrial Butterfly Valves
- MSS SP-67 – Resilient Seated Butterfly Valves
- ASME B16.34 – Pressure-Temperature Ratings
- API 598 – Inspection & Testing
Face-to-face dimensions as per: EN 558, API 609 (Where applicable)
Flange drilling as per: ASME B16.5, EN 1092-1, IS Standard
PRODUCT DESIGN OVERVIEW
Double flanged butterfly valves have integral flanges on both sides of the body, allowing direct bolting to pipeline flanges without additional support components.
Design includes:
- Concentric disc arrangement
- Molded or replaceable seat
- Full flanged body construction
- Blow-out proof shaft
- Precision machined disc
This design provides:
SIZE & PRESSURE RANGE
- Size Range: DN 50 mm to DN 1200 mm
- Pressure Rating: PN10 / PN16 / PN25
- ANSI Class 150 / 300 (Where applicable)
- Temperature: As per seat material limits
Double flanged design is recommended for medium to large diameter pipelines requiring rigid installation.
MATERIALS OF CONSTRUCTION
Body Materials: Cast Iron (CI), Ductile Iron (DI), WCB (Carbon Steel), CF8 (SS304), CF8M (SS316)
Disc Materials: SG Iron (Nickel Plated), SS304, SS316, Aluminium Bronze, Duplex (On Request)
Molded Seat: EPDM, NBR, Viton
Replaceable Seat: EPDM, NBR, PTFE
DESIGN FEATURES
- Integral double flanged body
- Bi-directional sealing
- Low operating torque
- ISO 5211 mounting pad
- Blow-out proof shaft
- Suitable for automation
- Bubble-tight shut-off
END CONNECTION
- Double flanged ends
- Compatible with ANSI / DIN / IS drilling
- Secure bolted installation
TESTING & QUALITY CONTROL
All valves tested as per API 598:
- Hydrostatic shell test
- Seat leakage test
- Functional torque verification
Third-party inspection available upon request.
OPERATING PRINCIPLE – DOUBLE FLANGED DESIGN
The disc rotates 90° to regulate or isolate flow.
- 0° – Closed
- 90° – Fully Open
Resilient elastomer seat ensures reliable sealing performance within rated pressure limits.
Applications
- Municipal Water Distribution
- Wastewater Treatment Plants
- Cooling Water Systems
- Power Generation Plants
- Large Industrial Pipelines
- Marine & Infrastructure Projects
DOUBLE FLANGED VS WAFER VS LUG – ENGINEERING COMPARISON
| Feature | Double Flanged | Lug | Wafer |
|---|---|---|---|
| Installation | Direct flange bolting | Threaded lugs | Between flanges |
| Mechanical Strength | Highest | Moderate | Moderate |
| Large Diameter Suitability | Excellent | Good | Good |
| Maintenance | Requires full removal | One-side removal | Line shutdown required |
Double flanged valves are preferred in large pipelines where mechanical rigidity is critical.
AUTOMATION COMPATIBILITY
Available with: Pneumatic Actuator, Electric Actuator, Gear Operator, Manual Lever.
Suitable for automated flow control systems in large diameter pipelines.
Frequently Asked Questions
ENQUIRY DETAILS REQUIRED
To select correct valve, please provide:
- Size (DN)
- Pressure Rating
- Body Material
- Disc Material
- Seat Material
- Media
- Operating Temp
- Quantity
- Application
Our engineering team will assist in proper configuration and material selection.
