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IMI CCI
VBSE High-pressure Turbine Bypass Valve
High-pressure steam conditioning valve for ultra-supercritical turbine bypass applications.
Delivers precise steam conditioning and desuperheating for turbine protection during load changes and start-up.
Reduces maintenance time with a modular trim, welded seat, and quick access to internal components.
Offers robust high-pressure performance with a forged body, pressurised seal bonnet, and exchangeable trim design.
Features
The VBSE is a high-performance turbine bypass valve engineered for steam throttling and desuperheating in ultra-supercritical power plants. It manages steam start-up and load rejection by bypassing steam to reheat lines until the temperature matches turbine requirements. With a forged body, modular trim, and spring-loaded spray water injection, the VBSE delivers reliable control under extreme conditions. It is available with hydraulic, electric, or pneumatic actuation and features a pressurised seal bonnet for high-pressure integrity. Easy access to internals, a reduced component count, and a choice of plug designs support long service life, low maintenance, and exceptional flow control accuracy.
Key features
Designed for supercritical power plants
Forged angle body, flow-to-close
Pilot-operated welded trim
Spray water injection with spring-loaded nozzles
Temperature: up to 630°C
Inlet pressure: up to 350 bar
Seat leakage: EN 12266-1 Cl. B / MSS-SP61 / ANSI FCI 70.2 Cl. V
Hydraulic, electric, or pneumatic actuator
Noise-reducing drilled bonnet cage
Certified to PED 2014/68/EU
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
