​​​​​​​​​​​​​​​​IMI Z&J is an international leader in the provision of custom-engineered high temperature valves for the iron & steel, petrochemical and refining industries.
We have over 135 years experience of working with refiners, technology licensors and operators to develop our high-quality, specialised valves. We specialise in valves that are suitable for use in high operating temperatures, large sizes, and that have a high frequency of operation. Our in-house engineers customise valves to customers' needs, and we continue to develop advanced technologies to reduce the long-term operating costs. ​​

Critical applications

  • Petrochemical
    We also have a range of inlet and outlet and isolation valves (for air and hydrocarbon as well as for purging) for the dehydrogenation process (PDH) and high performance isolation valves for ISOSIV / TIP Units.​

  • Iron & Steel
    IMI Z&J supplies valves such as: Hot Blast Valves, Shut Off, Pressure Control and Flow Control Valves, Goggle Valves and Bleeder & Equalizing Valves.
    IMI Z&J is also a supplier of Top Gas Recovery Turbines (TRT), which are in service all over the world. Our new and advanced technology to optimise charging of Blast Furnaces, is the "No-Bell Top Charger". We also supply intelligent solutions for blast furnace plants like the 3D level measurement system p-matriX and the 2D gas temperature measurement system t-matriX.​

  • Glass
    With more than 50 years of experience in design, production and the worldwide supply of equipment for the glass industry IMI Z&J has made its mark in reliability and long lifetimes.
    Along with a full product range of valves, we produce blanket batch charges for the glass industry. These can be twin-coupled charger units, modular charger units and electric control systems to ensure the burden is loaded to maximize throughput of quality output.​

Key technologies

  • Wedge-within-Wedge type gate valves​
    IMI Z&J introduced the wedge-within-wedge gate valve to the market and has more than 60 years of experience with the double disc wedge within wedge design. Designed for extreme operating conditions, high temperature, high pressure, line stresses and high frequency of operation.

  • Fully Automatic and safe Fractionator Isolation Valves
    Double-Block and Purge shut-off (offers the same functionality like a blind flange), internal components kept clean of medium, seats protected, in both the open and closed positions, from erosion and coking medium.

  • Fully Automatic, "man safe" isolating Goggle Valves
    For i.e. Flue Gas, Expander outlet, CO Boiler Isolation. Tight shut-off in accordance with safety regulations, high operating temperatures, in hot-wall or cold-wall design, the valve is designed for temperature fluctuations.

  • Automatic Coke Drum Unheading devices for the Top and Bottom of the coke drum.
    Two independent discs designed for limited thermal distortion, less steam usage and less erosion. The two independent discs provide a true double block and Purge​.

Aftermarket services

Field service is understood by our specialist team as being available on site within the shortest possible time–complete with portable equipment containers, erection equipment and special tooling. We are particularly well equipped to undertake all types of Special Valves, various types of Drive Systems and the servicing of Blast Furnace plants, oil refineries, chemical plants and float glass units. ​

Latest News

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Another big aftermarket win in LATAM for IMI Critical Engineering
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Important Update – COVID-19
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Valve Doctor programme celebrates 20th anniversary
16 September 2019
Unconventional support for the unconventional oil and gas industry
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17 June 2019
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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

Fast facts



Joined IMI:


Installed base:

13,500 valves; 250 other products




Germany, China, USA, South Africa​



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