IMI Bopp & Reuther designs, manufactures and distributes high quality safety, control and shut off valves. Our technology ensures that people and investments are protected while conserving natural resources and raw materials. For over 135 years, the market’s leading operators of conventional and nuclear power plants have placed their trust in our expertise. Sensitive processes in industrial plants such as chemical, petrochemical and refineries, also rely on our valves to ensure that critical processes are safely and efficiently protected and controlled. We also operate one of the most modern and efficient valve testing facilities in the world.​

Critical applications

  • Process industries
    IMI Bopp & Reuther safety valves can be found wherever pressure systems for steam, gases and liquids need to be reliably protected, including the chemical industry, petrochemicals, power generation and ​supply, process steam systems, water supply systems, refineries and polymer applications. We offer both bespoke solutions and standard products for all of these areas.  With innovations such as the new compact safety valve Si 11/13/14, we continuously support plant engineers and operators in their efforts to achieve increased economic efficiency and flexibility.​

  • Power plants
    IMI Bopp & Reuther safety, shut off and control valves can be found wherever there is a need to safeguard or precisely control the operating conditions in steam and water systems. We are a recognised and approved manufacturer of safety, shut off and control valves as well as a complete system solutions provider for all types of power plant – coal fired, combined cycle, industrial power plants, combined heat and power plants, desalination plants, biopower plants and cogeneration power plants. We develop and deliver individual solutions matched to our customer requirements and specifications for all of these technologies. 

  • Nuclear industries
    IMI Bopp & Reuther has been a partner for the nuclear power industry since the 1960s, designing, manufacturing and supplying new and replacement valves for upgrades, new projects and special individual applications. We have all the necessary international certifications and authorisations for the nuclear power plant industry (eg. KTA, ASME Sec. III, N, NV, NPT- Stamp) and is additionally audited and approved by global players such as AREVA NP, EDF and KEPCO/KHNP.​​

Key technologies​

Aftermarket services​

We provide aftermarket services for every valve, across all phases of a valve’s lifecycle, all over the world. Our Service network comprises over 100 service technicians, 4 manufacturing facilities and an efficient back office, providing fast and effective support. We will assist you from the erection and commissioning and continue to accompany your installation through regular maintenance and any retrofits as may be required.

Sizing Software: Si-tech 4

A state-of-the-art sizing software for safety valves with multiple innovative features combining the huge complexity of the applied codes and standards with intuitive operability - you will find most features accessible with a maximum of two clicks.


You can register for the freeware Si-Tech 4 here​​ - Fill out the registration form online and IMI Bopp & Reuther will send you a download link via email.​​​


  1. Numerous calculation and code regulation options

  2. Large data base including all types of IMI Bopp & Reuther safety and relief valve types

  3. Clearly arranged selection of valve design options for optimum safety valve configuration

  4. A project valve manager with assistant functions for project valve packages

  5. Informative Sizing and Data Report with convenient useful export alternatives

  6. Comprehensive choice of languages for program use and data export

  7. The user interface designed with the latest Windows user features

​…and many other excellent options are implemented in Si-Tech 4.0

Latest News

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

Fast facts

Joined IMI:2015
Installed base:150,000
Employees: 400+
Locations:​​Germany, ​China, Korea, India, Romania


Global sales:
​T: +49 (0) 621 / 76 220 0
E: imibur.sales@imi-critical.com

 Our locations

Sizing Software

Si-Tech 4

You can register for the freeware Si-Tech 4 here​ - Fill out the registration form online and IMI Bopp & Reuther will send you a download link via email.​​​

IMI Bopp + Reuther