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