Product - 840 Conventional Valve (Ch)

​Control valves for general applications​.

​​The 840 series cage-guided valve is specially designed using recent advances in control valve technology. It is used to control a wide variety of relatively clean liquids and gases at high pressure differentials. Configured with either flow-to-open or flow-to-close trims, the valve is well suited for steam, gas or liquids, where flow-to-close is typically used for liquid service, and flow-to-open for steam and gas. The design of the 840H (drilled-hole-cage) valve is primarily used for severe service applications requiring anti-cavitation or low-noise trim. In most cases, high pressure drop in process conditions may cause erosion, noise or vibration, which can affect process control. The 840H is a good solution to this severe service application.​​​​​​​

​Key features

The 840 series valve is flexible, allowing a variety of trim types to be installed in the body. In addition, its cage-guided construction reduces plug vibration and provides stable performance throughout travel. All 840 trims have a quick change design to guarantee convenient repair and easy trim replacement.  

Multi-spring
  • Multi-spring design allows very low hysteresis and dead band.

Proven trim design
  • Single P-port, multi-step, V-notch type cage.

Fail mode
  • Fail-to-close on loss of air is standard.
  • Fail-to-open on loss of air is also available.  
  • Diaphragm, piston, hydraulic and electric actuation available.

Quick change trim
  • All internal parts can be inspected easily by removing bonnet and cage.

Accessories
  • A full range are available to meet requirements.​

Benefits

Tight shutoff
A variety of shutoff classes from ANSI IV through VI are available to meet application requirements

Easy maintenance
Top-entry design and a cage-retained seat ring allow for quick inspection or trim change

Simple to change capacity and characteristics
A simple cage 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 840 valves to be applied to corrosive/sour gas services with full compliance to NACE requirements

Product Specification

Valve size
1” through 20”

Ratings
ANSI class 150-2500 (DIN and JIS available)

End connections
Raised face flange, weld ends (BW and SW)

Flow characterisation
Linear on equal percentage to suit application

Seat leakage
Standard ANSI class IV, option-ANSI class V or VI

Temperature range (general)
1/2”~4” -30ºC ~ 300ºC (Standard)
-196ºC ~ 565ºC (Ext.)
6”~20” -30ºC ~ 300ºC (Standard)
-196ºC ~ 565ºC (Ext.)​

Applications​

  • 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,
    acetit acid, PTA, AN, NH3, pulp & paper

  • Cryogenic: LNG​

Materials



Quick change trim

According to the Practical Guide to Control Valves edited by the Instrument Society of America (ISA): “Valve Trim shall be of the Quick Change type for ease of maintenance, no internal components shall be screwed or welded into the valve bodies or bonnets. Trim shall be designed to provide equal pressurisation around the plug in order to minimise vibration and prevent any potential problem from binding.”

Drilled-hole-cage - 840H
  • The 840H Drilled-Hole-Cage trim provides proven performance in high pressure drop applications without cavitation, noise, erosion and vibration

Anti-cavitation
  • Cavitation is the sudden growth and collapse of vapour bubbles (cavities) in downstream liquid. To avoid the associated noise and vibration the right number of multi-stage and multi-path trim design should be adopted

Low-noise
  • High mass flow and/or pressure drop in compressible fluids like gas or steam is a major source of noise and accompanies vibration in the system. The right source treatment depends on the right multi-path, multi-stage trim. IMI CCI Drilled- Hole-Cage design provides noise attenuation in a modular design​


Product dimensions​

​Download the product brochure on the right hand side for a larger image.

 

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Product - 840 Conventional Valve (Ch)