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NBSE
Low pressure turbine bypass valve
The NBSE is a steam conditioning valve used for steam throttling and desuperheating through spray water injection, directly at the outlet. Used for start-ups and load rejection, they dump steam from reheat lines to condenser until the steam temperature matches the turbine blade temperature.
- With the range of available body materials, the NBSE valve can be used for steam pressures and temperatures of today’s most advanced single and double reheat thermal power plants.
- Specially designed for modern ultra supercritical power plants load ramping and trip case requirement.
- Forged body design with flow-to-close flow pattern.
- Available in pressure seal bonnet and bolted bonnet design.
- Can be equipped with hydraulic, electromechanical or pneumatic actuator.
- Seal welded seat with Integral first stage PR tube allowing for quick maintenance and replaceable features.
- Spring loaded water injection nozzles.
- Different plug designs available.
Product Specifications
Body style
- Forged angle type valve body, flow direction – flow to close
Nozzle connection
- For steam pipes: butt-welding, acc. to customer?s requirement
- For spray water pipes: butt-welding, acc. to customer?s requirement
Trim design
- Welded seat ring, pilot operated trim
Steam data
- Temperature range: up to 630øC
- Inlet pressure: up to 80 bar
Seat leakage class
- EN 12266-1 Cl. B or MSS-SP61 or ANSI/ FCI 70.2 Cl. V
Actuation
- Hydraulic, electric or pneumatic actuator
Serviceability
- All internal trim parts, seat ring (welded), spray nozzles
Options
- Transition pieces for large pipe diameters and material compatibility
- Prewarming and/or drain connection available upon request
- Pressure seal and bolted bonnet design
Certification
- Certified acc. to PED 2014/68/EU
Design code
- EN 12516-2, others upon request
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