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Butterfly Valves
Derwent Industries offers a wide selection of butterfly valves designed to meet the needs of various industrial applications. Our range includes double flanged seal on disc, seal on body, lugged, and wafer butterfly valves, available in sizes from DN 40 to DN 2000 and pressure ratings ranging from PN 10 to PN 40. We provide butterfly valves in a variety of materials such as cast iron, ductile iron with approved epoxy coating, stainless steel, PVC, and FIP thermoplastics. In addition, Derwent Industries AVFI offers riser extensions, gearboxes, and automated valves with electric or pneumatic actuators tailored to your requirements, ensuring quick turnaround times. Buried service options are also available upon request.
For further details, refer to our comprehensive data sheets. Refer to the appropriate data sheet for full details on Derwent Industries butterfly valves.
Basic Types of Butterfly Valves
| Valve Type | Description & Key Features | Primary Applications |
|---|---|---|
| Wafer Style | Clamped directly between pipe flanges using long studs that wrap around the valve body. Lightweight, highly economical, and space-saving. | Standard line isolation and flow regulation. |
| Lugged Style | Features threaded "ears" (lugs) around the body that bolt directly to pipe flanges from both sides. | End-of-line service, allowing downstream pipe maintenance while holding pressure upstream. |
| Double Flanged (Seal on Disc / Body) | Features integral flanges on both ends matching standard pipe flange patterns. Offers double-eccentric disc movement for reduced wear and long service life. | Drinking water supply, raw water mains, wastewater, and heavy industrial plant piping. |
FAQ
What types of butterfly valves does Derwent Industries offer?
Derwent Industries supplies a comprehensive range of high-performance butterfly valves designed for water, wastewater, irrigation, and industrial applications. Our range includes:
Double Flanged Valves: Available in Seal on Disc (e.g., D-AV-2000 Series) and Seal on Body (e.g., AB13F Series) configurations.
Wafer Style Valves: Compact and lightweight options ideal for clamping between pipe flanges.
Lugged Style Valves: Fully lugged designs suitable for end-of-line isolation service.
Custom & High-Pressure Valves: Including 600mm ductile iron high-pressure variants and stainless steel high-performance models.
What size ranges and pressure ratings are available?
Our butterfly valves span nominal diameters from DN 40 up to DN 2000. Pressure ratings range from PN 10 to PN 40, catering to both low-pressure distribution lines and high-pressure transmission networks.
What materials and coatings are used?
We supply valves constructed from cast iron, ductile iron, stainless steel (316), PVC, and FIP thermoplastics. Ductile iron bodies are coated with Fusion Bonded Epoxy (FBE) for exceptional corrosion resistance. Vulcanised rubber liners and EPDM or rubber body seals ensure bi-directional, bubble-tight sealing.
What actuation and accessory options are available?
We provide various operation controls tailored to your site specifications:
Manual & Gearboxes: TK range quarter-turn worm gearboxes and handwheel assemblies.
Automated Actuators: Fitted with electric or pneumatic actuators for remote flow control.
Extensions: Riser extensions, extended shafts, and buried service configurations upon request.