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IMI CCI
NBSE Low Pressure Turbine Bypass Valve
Efficient steam throttling and desuperheating for ultra-supercritical power plants with rapid response.
Modular design supports various power plant configurations with enhanced steam control and rapid response.
Noise-reducing inlet bonnet cage and spring-loaded water injection nozzles improve efficiency and longevity.
Easy maintenance with seal-welded seats and exchangeable trim ensures minimal downtime.
Features
The NBSE low-pressure turbine bypass valve is engineered for steam conditioning, efficiently handling steam throttling and desuperheating via spray water injection at the outlet. It plays a critical role in plant start-ups and load rejections by diverting steam from reheat lines to the condenser until steam temperature matches turbine blade conditions. Designed for ultra-supercritical power plants, it offers robust performance with a forged angle body, flow-to-close operation, and a modular trim design. With bolted or pressure-seal bonnet options and compatibility with hydraulic, electromechanical, or pneumatic actuation, the NBSE ensures long-term reliability, reduced noise emissions, and easy maintenance access.
Key features
Designed for supercritical power plants
Forged angle-body, flow-to-close design
Pressure-seal or bolted bonnet options
Steam rating: up to 80 bar, 630°C
Hydraulic, electric, or pneumatic actuation
Welded seat ring with pilot-operated trim
EN 12266-1 Cl. B or MSS-SP61 leakage class
Butt-welded connections for steam/spray water
Optional transition pieces for large pipelines
Specifications
Fluid Types
Steam
Trim Category
Multi-Stage
Material
A192-F22
A182
F91
A182-F92
Actuator Type
Hydraulic
Electric
Pneumatic
Spray Injection Category
Variable Area Nozzle
Design Codes
ASME (Section VIII)
EN
Service Category
Severe
Certification
PED 2014/68/EU
Temperature Limits (°C)
300 to 650
