Product - DA-90DSV

​​​​​​​​​​​IMI CCI is the world leader in the design and application of severe service control valves for critical applications in Fossil Power, Nuclear Power, Oil and Gas. Liquifaction and Petrochemical industries. With each new operating season, the limits of interstage attemperators in Heat Recover​y Steam Generators (HRSGs) are being tested. As plants search for the most economical operation, be it cycling daily or operating at reduced loads for extended hours, reliability and operability of the superheat (SH) and reheat (RH) interstage attemperators consistently come into question. Whether it is a constantly leaking attemperator that must be repaired or replaced at every outage, or a more catastrophic failure like a boiler tube leak or a ruptured steam line, the headaches and frustrations associated with interstage attemperation are becoming all too familiar to plant managers, operators, and maintenance personnel. 

​Key features

  • Light weight cast body
  • Class V shut-off
  • Graphite stem packing
  • Forged design
  • No trim in steam flow
  • Tapered profile to minimise flow 
induced vibration
  • Variable spray nozzle

Typical symptoms of faulty attemperators

Many of the alternative interstage attemperator systems overlook several or all of the root causes of failure. Such designs will lead to problems in your plant, it’s only a matter of time! 

Some of the first signs of trouble start with uncontrolled spraywater flow and leakage. Scheduled inspections often reveal:
  • Damaged spray nozzles
  • Cracked attemperator housings
  • Damaged seals
  • Cracked steam pipes and boiler tubes
  • Cracked/broken thermal liners

The root cause of most interstage attemperator problems can be traced to four main system/installation parameters:
  • High pressure drop through the spraywater control portion of the attemperator
  • High thermal stresses caused by large temperature differences between the steam and the cooling water
  • Poor atomization of the cooling water leading to large amounts of unevaporated water in the steam line
  • Poor installation with short distances to downstream elbows, temperature sensors, or HRSG re-entry points.

Prevent cavitation damage


Class V metal seat with 500 PLI (pounds per 
linear inch of seating contact) loading force 
to achieve tight shut-off​​


Provides the Valve Doctor™ Solution
  • IMI CCI can offer the Valve Doctor™ solution, working with plant operators to improve plant performance, reliability and output

Prevents Cavitation Damage
  • IMI CCI Works in accordance with ISA guidelines to ensure cavitation is avoided

Eliminates Erosion Damage
  • By controlling fluid velocities, erosion is eliminated

Thermal Stress Analysis
  • IMI CCI accounts for all thermal streses in the attemperator design

Stops Costly Maintenance Cycles
  • IMI CCI valves are designed and sized to provide longer intervals between maintenance and allows easy access to all components

Eliminate Thermal Damage to Trim
  • Control element is outside of the hot steam flow
  • Proven Desuperheating Experience

Eliminate vibration potential
  • ​Tapered probe design eliminates potential for flow induced vibration

Technical specification


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Product - DA-90DSV