Product - DAK (Manifold Valve)

​​​​​​​​​​​​Gate Valve Replacement Solution

To ensure that large steam boilers are physically balanced and not subject to undue forces, the steam outlet piping is usually taken from both sides of the boiler and then brought together in a manifold to a central main steam line to the steam turbine. The pipes from the boiler are also usually equipped with manual gate valves which can be closed for pressure testing and/or maintenance. The DAK valve replaces these gate valves and the manifold to integrate all those functions in one single valve. The design of the valve also improves the steam flow reducing pressure drop and thus improves the overall efficiency of the plant.

Key features

  • Simple operation
  • Monolithic body design to avoid weld joints
  • Excellent streamlining to reduce pressure drop across the valve and increase plant efficiency
  • Modular design of the valve to meet customer specifications and requirements
  • Inlet, outlet and bypass connections to match the dimensions and material of the pipework


The DAK valve is designed to join the 2 main steam lines exiting the boiler and if required to isolate the boiler from the piping. The valve is designed to take the two steam lines from the boiler and centralise the flow into a single pipe exiting the valve.

  • The valve internal design is precisely machined to ensure maximum flow efficiency and to reduce the pressure drop across the valve thus ensuring maximum efficiency of the entire plant
  • Because of the installation in the main steam system, the body is machined from forged alloy material to ensure long life under exposure to the extreme temperatures and pressures especially in ultra super critical power plants
  • The valve seat is integrated in the body and hard faced for added durability and a long, trouble free life


The DAK valve replaces the gate valves and the connecting manifold that are installed in the initial run of the boiler superheater outlet piping to the main steam piping to the steam turbine.
  • The DAK valve can be shut off (manually or with an actuator) to conduct maintenance and/or pressure testing 
  • The valve has 3 weld seams into the boiler oulet piping as opposed to 7 weld seams if gate valves and a manifold are installed, thus saving time and costs during the piping erection​

We combine our decades of experience, expertise and knowledge to satisfy the demands that our customers place on us

Technical details

Body style
  • 2 inlets and 1 outlet, Y-shaped body
Operating limits
  • Temperature up to 650ºC
  • Inlet pressures up to 350 bar[a]

  • Butt-weld ends according to the 
customer’s specification
  • Seat
  • Hard faced seat

  • Self-sealing bonnet

  • Manual, electric or hydraulic

  • AD 2000, TRD, IBR, manufactured 

Product breakdown

Latest News

IMI Truflo Marine unveils plans for new headquarters
05 November 2020
Half a century for Keith at IMI Truflo Marine
06 October 2020
IMI Critical Engineering digital FAT delivers customer projects on time
07 September 2020
Another big aftermarket win in LATAM for IMI Critical Engineering
18 August 2020
Important Update – COVID-19
18 March 2020
Valve Doctor programme celebrates 20th anniversary
16 September 2019
Unconventional support for the unconventional oil and gas industry
01 July 2019
17 June 2019
IMI CCI showcases choke valve at DUG Rockies conference
04 June 2019
Jackie Hu appointed Divisional Managing Director of IMI Critical Engineering
07 March 2019
Roy Twite to succeed Mark Selway as Chief Executive of IMI plc
05 March 2019
IMI Critical holds Safety Summit
21 September 2018
New HSE handbook to help keep field service engineers safe
10 August 2018
Safety first at IMI Critical
31 July 2018
IMI InterAtiva’s Series RK Valves certified ‘fire-safe’
24 July 2018
IMI CCI participates at regional VPP Safety Summit
08 June 2018
Largest Romanian customer recommends IMI Remosa
10 May 2018
Lean success in IMI Critical back office functions
04 May 2018
Isolation valves adapted for Fluidised Catalytic Cracking applications
30 April 2018
IMI Critical Korea closes in on world-class LEAN performance
27 April 2018
IMI board tours IMI Critical businesses
25 April 2018
New positioner software tools from IMI STI
08 February 2018
Launch of Zero Backlash Scotch Yoke Mechanism
16 January 2018
IMI Critical Korea certified to sell actuators in Europe
20 September 2017
IMI Critical named ‘supplier of the year’ by Korea’s Doosan
19 September 2017
100th Valve Doctor graduates from IMI Critical
13 September 2017
Top HSE certification for IMI Critical’s California site
12 September 2017
Launch of High Endurance Actuator
21 April 2017
Launch of AB6350 valve
06 April 2017
Launch of 100DPC Multi-trim
17 March 2017
Launch of 840GS control valve
22 December 2016
IMI Critical to exhibit new technology at ADIPEC 2016
25 October 2016
New graduates join IMI Critical in four countries
22 September 2016
IMI Critical to take stand at ONS 2016 in Norway
16 August 2016
IMI Critical opens new China plant in Qingpu
27 July 2016
IMI CCI Korea celebrates 2,000 days of no “Lost Time Accident”
25 July 2016
Visit to IMI Z&J Germany by the Russian Economic Bureau from Bonn
11 July 2016
IMI Z&J Düren moves into modern offices
08 July 2016
IMI Critical Engineering forms strategic partnership with MRC Solberg & Andersen
05 April 2016
IMI Way Day 2016 date announced
01 March 2016
NEW IMI Eye – fourth edition
26 February 2016
IMI Critical co-locates China businesses
20 January 2016
IMI CCI Switzerland gains certification for new generation safety valves
18 December 2015
IMI Critical rise to Dragon challenge
30 November 2015
IMI STI achieves CRCC approval for new products
24 November 2015
IMI Truflo Marine Attend the Engineering Technology and Innovation Exhibition 2015
23 November 2015
IMI CCI Sweden secures new contracts on three continents
23 November 2015
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
Key clients attend grand opening of new Aberdeen facility
23 October 2015
IMI companies ‘act as one’ to deliver for customer
02 October 2015
IMI CCI Sri City approved by NTPC
01 October 2015
IMI Critical Engineering showcases innovation at Valve World Expo Asia
28 September 2015
Nexen awards IMI Orton
25 September 2015
IMI Critical Engineering celebrates opening of new Jubail repair centre
23 September 2015
IMI Critical and IMI Precision join forces at Valve World Expo + Conference Asia 2015
21 September 2015
IMI Critical Engineering opening of new Jubail Repair Centre
18 September 2015
IMI CCI India manufactures first 1050MW turbine bypass valve
20 May 2015
Largest ever contract for IMI Critical Engineering
18 February 2015
New Houston facility opens
12 February 2015
IMI Critical completes acquisition of Bopp + Reuther
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


Global sales:

Product - DAK (Manifold Valve)