The Koreyda double offset butterfly valve represents a critical advancement for power plant piping systems. Its dual-eccentric design—featuring offset shaft placement from both the seat centerline and pipeline axis—creates a cam-action sealing mechanism that eliminates constant friction between disc and seat. This engineering principle ensures bubble-tight shut-off at elevated pressures and temperatures while dramatically extending service life. For plant engineers and operators, this translates to enhanced system reliability, reduced maintenance cycles, and optimized thermal efficiency across critical processes.
Get a Free QuoteHigh-Temperature & Pressure Capability
Engineered for Class 150 to Class 600 applications, with specialized designs available for higher classes
Temperature ranges from -45°C to +650°C using advanced seat materials (graphite, metal-seated designs)
Fire-safe designs compliant with API 607/API 6FA standards for hydrocarbon service
Specialized Material Configurations
High-Temperature Alloys: Bodies and discs available in ASTM A217 C5/C12/C12A for corrosion resistance in flue gas desulfurization (FGD) systems
Power Plant Standard Construction: Carbon steel with STL trim for main steam bypass, duplex stainless steel for cooling water with high chloride content
Advanced Seat Technology: Multiple seat options including:
Graphite-laminate seats for extreme temperature cycling
Metal-seated designs with Stellite or Inconel overlays for erosive applications
Resilient seats with fire-safe certification for auxiliary systems
Precision Flow Control Characteristics
Low Torque Operation: Cam-action design reduces operating torque by 40-60% compared to conventional valves, enabling smaller actuators and reliable operation after extended periods
Excellent Throttling Capability: Precise disc positioning provides stable flow characteristics for:
Bypass valve service in turbine applications
Feedwater control and regulation
Cooling water modulation
Minimal Pressure Drop: Streamlined disc profile and optimized flow path reduce system head loss, contributing to overall plant efficiency
Robust Design for Critical Services
Extended Temperature Cycling Capability: Engineered to withstand rapid thermal changes without compromising seal integrity
Anti-Blowout Stem Design: Secured stem construction prevents stem ejection under high-pressure conditions
Contained Bearing Systems: Lubricated or self-lubricating bearings isolated from process media, ensuring smooth operation in abrasive applications
Power Plant-Specific Configurations
Turbine Bypass Valves: Custom-engineered for rapid response and tight shut-off
FGD System Valves: Special corrosion-resistant designs for abrasive slurry service
Condenser Cooling Water: Large diameter valves with bi-directional sealing
Auxiliary Steam Systems: Compact designs for space-constrained installations
Typical Power Generation Applications
Fossil Fuel & Combined Cycle Plants:
Main steam bypass and drain systems
Feedwater heater isolation
Condenser circulating water (CCW) systems
Auxiliary cooling water networks
Fuel gas/oil isolation and control
Flue gas desulfurization (FGD) systems
Nuclear Power Applications*:
Essential service water systems
Component cooling water
Demineralized water treatment
Why Koreyda for Power Generation?
Industry-Specific Expertise: Decades of experience designing valves for critical power services
Testing & Certification: Valves undergo rigorous testing including:
Fugitive emissions testing per ISO 15848-1
High-cycle fatigue testing
Fire-safe certification
Global Service Support: 24/7 technical support with strategic spare parts inventory at key energy hubs
Custom Engineering: Application-specific modifications for unique plant requirements
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