Product - 840GS Control Valve


​The 840GS control valve has been specially designed using recent advances in control valve technology. It is used to control a wide variety of fossil power and selected oil and gas applications. The 840GS valve is primarily used for semi-severe service ap​​plications requiring anti-cavitation or a low-noise trim. Under process conditions, in most cases, high pressure drop will cause erosion, noise and vibration, which affects process control and plant performance. Typical applications for the 840GS include heater drains, condensate water, steam service, spray water, level control, pressure control and flow control valves.​

Key features

The 840GS series valve is flexible, allowing a variety of trim types to be installed in the body. In addition, its rigid construction reduces plug vibration and provides stable performance throughout travel. All 840GS trims have a screwed seat design for convenient repair and easy trim replacement
  • Multi-spring
    • ​Multi-spring design improves hysteresis and dead band performance
  • Proven trim design
    • Single P-port
    • Drilled-hole cage
  • Fail mode
    • Fail-to-close on loss of air
    • Fail-to-open on loss of air
  • Screwed seat design
    • All internal parts can be inspected easily by removing bonnet
  • Accessories
    • A full range of accessories are available to meet requirements​


Tight shutoff
Shutoff classes from ANSI IV through VI are available to meet application requirements
A wide selection of actuation includes pneumatic and electric and top-mounted hand-wheel are available​
Easy maintenance
Top-entry design to allow for quick inspection or trim change
Simple to change capacity and flexible trim design​
A simple plug change is all that is required to change between reduced and full-sized capacity trims or between linear and equal percentage characteristics 
Sour gas/corrosive fluid capable
The wide choice of body and trim materials allows the series 840GS valves 
to be applied to corrosive/sour gas services with full compliance to 
NACE requirements

​Product specification

Valve size
1/2” through 6”

ANSI class 150 and 300 

End connections
Raised face flange, weld ends (BW and SW)
Flow characterisation
Linear or equal percentage to suit application

Seat leakage
Standard ANSI class IV, 
Optional ANSI class V or VI 

Temperature range (general)*
-46 ~ 350 °C for unbalanced trim
-46 ~ 200 °C for balanced trim​

​​Product specification

Seat leakage
Standard ANSI class IV, 
Optional ANSI class V or VI 

Temperature range (general)*
-46 ~ 350 °C for unbalanced trim
-46 ~ 200 °C for balanced trim​

*For higher temperature requirements please contact IMI CCI using the contact details listed on the back of this brochure​


  • Power: Nuclear, Combined Cycle, Oil & Coal fired Power Plants, Combined Heat & Power, District Heating
  • Oil and gas: Onshore, offshore, refinery
  • Chemical: Dyes, cosmetics, caprolaktam
  • Petro-chem: NCC, ethylene, BTX, PS, SM, VCM, PVC, LDPE, HDPE
  • Fine-chem: HCL, H2SO4, NHO3, acetic acid, PTA, AN,​ NH3, pulp & paper​


Product dimensions

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Product - 840GS Control Valve