Fabricated Steel Triple-offset Butterfly Valve for Water (PN6 to PN25)
Supreme Valves' Fabricated Steel Triple-offset Butterfly Valve is a highly engineered innovation designed specifically for large-scale municipal, desalination, and industrial water distribution networks. Built from fabricated carbon steel plates instead of traditional cast iron, it offers superior structural properties, impact strength, and customized face-to-face dimensions. Conforming to AWWA C504/C516, this metal-seated valve manages line impurities and provides a robust, zero-leakage, long-term flow control solution.
Key Applications
Industrial Applications & Engineering Problem Solving
The Engineering Challenge
In large water mains, standard cast iron butterfly valves are prone to structural cracking due to water hammer pressure surges or seismic settlement. Soft-seated butterfly valves suffer from rapid seat wear, tears, and degradation when sand, scaling, or bio-fouling are present, leading to continuous line leakage and massive water loss.
The Supreme Valves Engineering Solution
Our Fabricated Steel Triple-offset Butterfly Valve replaces brittle cast iron with tough, fabricated carbon steel plate (A516 Gr. 70). Equipped with an integral stellite-faced metal seat and duplex-graphite laminar seal, it provides robust bi-directional bubble-tight sealing that resists line debris and sand abrasion. Custom fabrication allows drop-in replacements matching any AWWA or EN dimensions, ensuring a highly durable, 30-year operational life.
Operational Use Cases & Scenarios
Large-Diameter Water Main Isolation
Operational Challenge: Providing safe, leak-free isolation on high-flow water pipelines where water hammer or pipe shifting is expected.
Engineering Benefit: High mechanical ductility of A516 steel prevents structural rupture, while metal seats resist sand scoring.
Desalination Cooling Water Loops
Operational Challenge: Corrosion and silt abrasion in cooling water pipelines and condenser isolation headers.
Engineering Benefit: Heavy-duty protective coatings combined with Stellite metal-to-metal seating ensure continuous leakage protection without seal wear.
Technical Specifications
Material of Construction (MOC)
Dimensions & Weights
| NPS Size (DN) | Short Pattern F2F (mm) | Height (B, mm) | Bore Diameter (mm) | Total Weight (kg) |
|---|---|---|---|---|
| 24" (DN600) | 267 | 725 | 578 | 570 |
| 28" (DN700) | 292 | 820 | 677 | 760 |
| 30" (DN750) | 318 | 930 | 727 | 845 |
| 32" (DN800) | 318 | 1000 | 777 | 860 |
| 36" (DN900) | 330 | 1030 | 878 | 1100 |
| 40" (DN1000) | 410 | 1145 | 978 | 1657 |
| 48" (DN1200) | 470 | 1385 | 1178 | 2858 |
| 64" (DN1600) | 600 | 1700 | 1578 | 6080 |
| 100" (DN2500) | 700 | 2550 | 2478 | 23500 |
Purchase Options
Features & Benefits
Fabricated Steel Plate Body
Fabricated steel construction provides much higher mechanical strength, ductility, and impact resistance than cast iron or cast steel, eliminating the risk of catastrophic body fracturing from water hammer.
AWWA C504 / C516 Compliance
Fully designed to comply with American Water Works Association (AWWA) standards for large-diameter municipal water mains and treatment plants.
Metal-to-Metal Seat Durability
Unlike soft-seated valves, the Stellite-faced metal seat easily handles sand, grit, and line debris, avoiding seat tears and extending operational lifetime up to 30 years.
Highly Customized Architecture
Fabrication allows custom face-to-face dimensions, custom flange drillings (AWWA C207 / BS 4504), and exact flow passage sizing, matching existing pipeline layouts perfectly.
Frequently Asked Questions
Q What are the benefits of fabricated steel over cast iron bodies?
Cast iron is brittle and susceptible to catastrophic fracturing due to water hammer or ground settlement stress. Fabricated carbon steel plate (ASTM A516 Gr. 70) offers outstanding mechanical ductility, higher pressure capability, and allows custom design modification without expensive castings, ensuring long-term safety.
Q Can these valves handle seawater and brackish water?
Yes. For seawater or desalination service, we can fabricate the body in duplex steel, or apply internal protective coatings like fusion-bonded epoxy, rubber lining, or overlay the wet parts with Stainless Steel 316L or Super Duplex.
Q Do these valves provide bi-directional sealing?
Yes. The triple-offset geometry provides high-integrity bi-directional bubble-tight sealing, complying with API 598 seat tightness requirements.