Product - AB6350 Turbine Bypass and Steam Conditioning Valve
​​​​​​​​IMI CCI Japan has over 40 years of experience to deliver integrated control valves and desuperheaters for turbine bypass and steam conditioning valves. In total, we have delivered more than 1,500 units of AB6000 series all over the world. AB6350 is a new design model of the AB6300 series for small Combined Heat and Power (CHP) applications. The AB6350 is designed to perfectly match power plants like incineration power plants, biomass power plants, and other small co-generation power plants.​​​

​Key features

In order to achieve the most sophisticated design of integrated turbine bypass system, AB6350 has following key features.
  • Actuator
    • Multi-spring diaphragm
    • Piston
    • Electric
    • Hydraulic
  • Cage, trim and seat
    • Multi-hole cage
    • Balanced trim with graphite balance seal
    • Quick change seat with graphite seal
  • Desuperheater
    • Steam atomizing
  • Accessories
    • A full range of accessories are available to meet requirements


  • Tight Shutoff
    • Shutoff classes from ANSI IV to V are available
  • Compact design
    • Increased Cv and inner flow area to allow design to be as compact as possible
    • Proven steam atomisation desuperheater system to achieve minimum temperature sensor distance
  • Flexible design
    • Outlet nozzle can be any size upon customer’s request (for Butt weld connection)
    • Optimal design desuperheater spray nozzl​es to fit required Cv
  • Easy maintenance
    • Quick change trim for easy and quick maintenance
    • No special tool required for maintenance
  • Longer life time
    • ​​​ContactDesuperheater nozzle tips installed for longer life time​

​​Product specification

Body type

Design standard
ASME B16.34
ASME sec. VIII Div.1

Body material

Flow direction
Flow to open

Bonnet type
Bolted bonnet

Valve size
2”, 3”, 4”, 5”, 6”, 8”

Pressure ratings
ASME 150 - 2500​

End connections
Butt-weld, flange

Max. 565 deg.C
Leakage class​
ANSI class IV and V

Seat type
Quick change

Spray nozzle
Steam atomizing

Multi-spring diaphragm, piston, el​ectric, hydraulic


​​Research and development

AB6350’s optimum design was developed from the know-how built from the vast experience of IMI CCI Japan supplying Pressure Reducing Desuperheaters globally, and research such as spray water particle size measurement and computer simulation of desuperheating performance.​


  • Incineration power plant 
  • Biomass power plant 
  • Co-generation power plant (combined heat and power)
  • Paper plant 
  • Chemical plant
  • Petrochemical plant
  • LNG ships 
  • Steel plant
  • Cement plant 
  • Food plant
  • Food plant

​​Product drawings and dimensions


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IMI Critical Engineering appoints new petrochemicals head
05 November 2015
IMI CCI Czech Republic gains ‘Safe Enterprise’ certification
03 November 2015
IMI Critical announces 90mRMB investment in China
29 October 2015
IMI CCI SriCity wins regional safety award
27 October 2015
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IMI companies ‘act as one’ to deliver for customer
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IMI Critical Engineering opening of new Jubail Repair Centre
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IMI CCI India manufactures first 1050MW turbine bypass valve
20 May 2015
Largest ever contract for IMI Critical Engineering
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New Houston facility opens
12 February 2015
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02 January 2015
IMI Critical takes family of brands to Valve World 2014
11 December 2014
IMI STI doubles size of Italian plant
20 October 2014


Product brochure:

AB6300 Series References:


​Global sales:
Product - AB6350 Turbine Bypass and Steam Conditioning Valve