n the critical networks of water treatment and municipal engineering, system reliability, long-term hygiene, and operational efficiency are non-negotiable. Koreyda's Double Offset Butterfly Valves are engineered to be the backbone of modern water infrastructure, offering superior performance in potable water distribution, wastewater treatment, and stormwater management—from source to tap and back to the environment.
Get a Free QuoteGeneral Description: The Engineered Solution for Water Systems
The Koreyda double offset butterfly valve is a high-performance evolution of the standard butterfly valve, designed for the demanding, 24/7 cycles of municipal applications. Its "double eccentric" design—where the disc axis is offset from both the seat center and the pipeline center—introduces a cam-action sealing mechanism.
This means the disc contacts the resilient seat only in the final degrees of closure, minimizing seat wear and providing a consistent, bubble-tight seal over an extended service life. For water authorities and engineering firms, this translates to reduced leakage (aligning with ISO 52011 standards for water loss), lower life-cycle costs, and assured system integrity for decades.
Key Details & Municipal Engineering Features
Hygienic, Safe, and Certified for Water
Potable Water Compliance: Our valves and their internal components (seats, seals) are manufactured with NSF/ANSI 61 and WRAS-approved materials (such as high-grade EPDM). They are designed to prevent contamination and maintain water quality.
Corrosion-Resistant Construction: Bodies are available in Ductile Iron with Fusion-Bonded Epoxy (FBE) coating (standard per AWWA C550), Stainless Steel (316/304), and Carbon Steel with specialized coatings, providing exceptional resistance to aggressive water, chlorinated chemicals, and atmospheric corrosion.
Bi-Directional, Zero-Leakage Shut-Off
Engineered for true bi-directional shut-off, Koreyda valves perform equally under pressure from either direction. This is crucial for:
Isolation in looped distribution networks.
Pump check valve bypass lines.
Backflow prevention in critical zones.
Optimized for Efficiency & Low Maintenance
Low Torque Operation: The offset design reduces operating torque by up to 60% compared to concentric valves, allowing for smaller, more cost-effective actuators and reducing wear on gear operators. This ensures reliable operation even after years of inactivity.
Low Head Loss: The disc profile and offset create an unobstructed, streamlined flow path when fully open, minimizing pressure drop and saving pumping energy across the system's lifetime.
Robust Design for Buried & Chamber Service
Extended Neck Design: Standard for buried valve applications, the extended stem allows for easy access to the operator through a standard valve box, protecting the stem from debris and enabling safe, easy operation from grade level.
Total Serviceability: Our valves feature a retained seat design and fully contained bearings, allowing for in-line maintenance and seat replacement without removing the valve body from the pipeline—a critical feature for minimizing downtime in critical treatment processes.
Full Range of Municipal Actuation
Manual Operation: Heavy-duty gear operators with position indicators, available with T-handle, handwheel, or nut operation.
Automated Control: Compatible with electric or pneumatic actuators for integration into SCADA systems, pump control sequences, and remote plant automation. All actuators can be housed in NEMA 4X (weatherproof and corrosion-resistant) enclosures.
Typical Applications in Water & Municipal Systems
Potable Water Treatment & Distribution:
Pump isolation and control
Reservoir inlet/outlet
Mainline isolation and zone control
Wastewater & Sewage Treatment Plants:
Primary/secondary treatment flow diversion
RAS/WAS lines
Effluent discharge
Digester and sludge control
Stormwater & Flood Management:
Pump station control
Outfall and retention basin control
Industrial Water & Cooling Systems.
Why Koreyda is the Preferred Partner for Municipal Projects
Standards Compliance: Valves are designed and tested to meet or exceed AWWA C504, EN 593, and other relevant international standards for waterworks.
Life-Cycle Cost Focus: We build valves for 50+ years of service, prioritizing durability and maintainability to protect municipal investments.
Engineering Support: Our team provides technical collaboration for valve sizing, specification, and special application challenges, ensuring optimal performance in your system.
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