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IMI CCI
VLN Turbine Bypass Valve
High-capacity turbine bypass valve for hot reheat steam with DRAG® and advanced desuperheating.#
Delivers quiet, stable performance under severe thermal and pressure conditions with DRAG® velocity control.
Minimises space and noise with outlet-mounted desuperheaters and spring-loaded nozzle design.
Reduces downtime and simplifies servicing with modular construction and quick-change trim.
Features
The IMI CCI VLN Turbine Bypass Valve is engineered for hot reheat and low-pressure bypass applications in combined cycle and conventional power plants. It delivers precise pressure and temperature control during start-up, shutdown, and trip events, protecting critical components from thermal stress and vibration. With optional DRAG® technology, spring-loaded desuperheaters, and fully modular construction, the VLN provides exceptional reliability, noise attenuation, and flexibility. Its compact design, tight shut-off, and integrated outlet desuperheating system minimise installation space and commissioning time. Designed for the most demanding steam conditions, the VLN ensures efficient, quiet, and safe steam bypass to condenser or vent.
Key features
For hot reheat and LP bypass
Integrated desuperheater with radial injection
Optional DRAG® multi-stage trim
Flow-to-close or flow-to-open
Compact, thermally compensated body
Tight shut-off to MSS-SP61
Temp range: up to 620°C
Trim sizes: 230–450 mm (Kv up to 5200)
Pressure class: ASME 900
Quick-change, non-welded trim
