Large-Diameter Flanged Butterfly Valve
Double Flanged · DN1200–DN3000 · PN10/PN16 · Waterworks & Hydropower
Reguvale's large-diameter flanged butterfly valve is purpose-built for large-bore pipelines where reliable isolation and low head loss matter. The double-flanged body is cast in ductile iron or carbon steel and coated with epoxy for corrosion protection, while the concentric rubber-lined disc delivers bubble-tight shut-off and low operating torque.
Size range runs from DN1200 to DN3000 (48\" to 120\") with pressure ratings of PN10 and PN16. Typical operation is a heavy-duty worm gear for manual valves; electric, pneumatic or hydraulic actuators are available for automated installations. The photos show a DN1200 unit being fitted with a worm gear operator in our Tianjin workshop, alongside multiple valves ready for waterworks projects.
These valves are widely used in water transmission, pumping stations, treatment plants, cooling water systems, reservoirs and hydropower stations. Each valve is hydrostatically tested and can be supplied with material and test certificates on request.
Product Video
Key Features
Extra-Large Size Range
DN1200 to DN3000 covers the largest water transmission and hydropower pipeline projects from a single supplier.
Double-Flanged Construction
Integral flanges on both ends provide full structural support and easy alignment in large pipework.
Low Head Loss Design
Concentric disc profile and smooth rubber seat give excellent flow capacity and low pressure drop.
Heavy-Duty Operation
Multi-stage worm gear, electric actuator, pneumatic actuator or hydraulic actuator options for every size.
Waterworks Materials
Ductile iron or carbon steel body, SS304/SS316 disc, EPDM/NBR seat; epoxy coating for long field life.
Factory Tested
Shell and seat pressure tests performed at our Tianjin factory; MTC and test certificates available.
Technical Specifications
| Parameter | Specification |
|---|---|
| Body Material | Ductile Iron GGG50 / Carbon Steel WCB (Epoxy Coated) |
| Disc Material | SS304 / SS316 / Ductile Iron Nickel-Al-Bronze Plated |
| Seat Material | EPDM / NBR / Viton(FKM) / PTFE |
| Design Type | Concentric (Rubber-Lined / PTFE-Lined) |
| Size Range | DN1200 – DN3000 (48" – 120") |
| Pressure Rating | PN10 / PN16 |
| End Connection | Double Flanged (ISO 7005-2 / EN 1092-2 / ASME B16.47) |
| Face-to-Face | ISO 5752 / EN 558 / API 609 |
| Operator | Worm Gear (Manual) / Electric / Pneumatic / Hydraulic |
| Temperature | EPDM: −20→+120°C | NBR: −20→+82°C | Viton: −15→+200°C | PTFE: −200→+200°C |
| Leakage Class | Class VI (Bubble-Tight) for rubber-lined |
| Standards | ISO 5752 / BS 5155 / MSS SP-67 / API 609 |
| Certification | ISO 9001:2015, SGS Material Test Certificate available |
Frequently Asked Questions
What sizes are considered large-diameter for butterfly valves?
Generally, butterfly valves above DN600 (24") are considered large-diameter. Reguvale's large-diameter flanged range starts at DN1200 and goes up to DN3000, with PN10 and PN16 pressure ratings.
Common questions about large-diameter flanged butterfly valves answered by our engineering team.
Are large-diameter flanged butterfly valves suitable for waterworks?
Yes. The double-flanged body and rubber-lined concentric disc are ideal for clean water, raw water, cooling water and hydropower. They are commonly used in pumping stations, treatment plants, reservoir outlets and distribution mains.
What actuator options are available for DN1200 and above?
Manual operation usually uses a heavy-duty multi-stage worm gear. For automated operation we offer electric actuators (on-off or modulating), pneumatic actuators with scotch-yoke or rack-and-pinion mechanisms, and hydraulic actuators for the largest sizes.
Can you provide factory inspection and test certificates?
Yes. Every valve is hydrostatically tested at the factory. We can provide material test certificates (MTC), hydrostatic test reports, shell and seat test certificates, and third-party inspection by SGS or other appointed agencies on request.
Applications & Use Cases
Water Transmission
Long-distance water mains, raw water intake and distribution networks.
Pumping Stations
Suction and discharge isolation, surge control and booster stations.
Hydropower & Reservoirs
Reservoir outlets, penstocks, cooling water systems and tailrace lines.
Cooling Water Systems
Power plants, steel mills, chemical plants and HVAC cooling towers.
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Helpful guides to help you specify and maintain butterfly valves.