PRV Support offers expert services on the Pressure Relief Valves and their applications in the heavy duty industries.






Customised training and expert support

on your pressure relief valves

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Oil and gas

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Industrial gas



Our solutions

The company PRV SUPPORT has been established on the idea that safety is the business of all. However, how to make each actor accountable without the knowledge of security and the awareness of the risks incurred.


PRV SUPPORT responds to the training needs of employees of any company working on pressurized applications. Depending on the profiles, the training themes will be different but the objective will be the same: to make everyone aware of the importance of their role in the continuity of the chain of security.


Of course, it is all about cost. Beyond the security objectives, it is as important to master the way of implementing them. It is for this reason that PRV SUPPORT provides its expertise on the methods of sizing and selection of pressure relief valves, as well as the methods of installation and testing of these latter, in order to better control the acquisition costs and the costs of ownership.


Founder of PRV SUPPORT



The company PRV SUPPORT has been founded by David Alexandre in March 2018.


He has spent his whole career in the industrial valve industries, including sixteen years working for

two majors Pressure Relief Valves manufacturers.  


  • 1990: Baccalauréat E (mathematics and Technologies) - equivelent to A Level (UK) or High-school diploma (US).
  • 1992: DUT GMP (mechanical and production engineering) - equivalent to Diploma of Higher Education (UK) or Associate's Degree (US).
  • 1994: Master International Trade - equivalent to Msc (UK) or Master's degree (US)
  • 1995: Master of Science in Business Administration and Information Tecnology - University of Central Lancashire (UK).
  • 1996: National Service - Air force commando - Second lieutenant (officer) - Instructor - bronze medal of national defense.
  • March 1997: Project inside sales engineer for a global isolation valve manufacturer (Keystone / Tyco).
  • March 2000: Area sales manager for a global plastic piping system manufacturer (George Fischer).
  • December 2001: Area sales manager for a global pressure relief valve manufacturer (Consolidated - Dresser group).
  • October 2006: Product and market manager for a global pressure relief valve manufacturer (Sarasin-RSBD - Weir group).
  • April 2016: Head of aftermarket department for a global pressure relief valve manufacturer (Sarasin-RSBD - Weir group).
  • September 2016: Cert. for the PRV repair seminar from the National Board of Boiler & Pressure Vessel Inspectors (IACET CEUs 2.6).
  • March 2018: Foundation of PRV SUPPORT SAS.


He is a member of the following professional associations:


  • ACP: french association of O&G consultant (member of the board of directors)
  • AFIAP: french association of pressure equipment engineers
  • AMIC: french association of the control and instrumentation professionals (member of the board of directors)
  • EVOLEN: french O&G and energy futures association

Address: PRV Support SAS

                13 rue de l'érable

                95540 Méry sur Oise



Tel: +33 (0)6 95 21 31 99 (available on Skype Enterprise & WhatsApp)




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PRV Support is a member of the following institutions:




The Oil & Gas Partnering Platform






The pressurised vessel and the obturator


As soon as the mankind was able to boil water to create steam, the requirement of control systems and safety(security) became an obvious fact.
The first cauldrons in terra-cotta were not by nature adequate for the boiling water. More than 3000 years ago, during the dynasty Shang (on 1600-1046 BC), emerge the first bronze cauldrons, with three (even four) feet and a simple cover.











In order to better control the steam generation in the cauldron, the Chinese had the idea 2000 years ago to use a hinged cover. This allowed to produce steam a (relatively) safer manner.















The direct load on the obturator


Early in the 14th, chemists began to use conical plugs, with later on the addition of a spring to act as a safety valve.

However, the first real safety valve appeared in 1680. In fact, Denis Papin (France, 1647-1712), installed in London from 1675 in order to follow the work of Robert Boyle (Ireland, 1627-1691) on the properties of the air, develops a steam engine. It happens to have all the attributes of a boiler, without bearing the name. It was called the Digester. It is equipped with a device that allows to control the pressure in a cylinder filled with water and exposed to the flame. The purpose of this one, whose adjustment was ensured by the choice of counterweight, was to ensure the exact cooking of the meats in the pot by maintaining the desired pressure. This device is, by its design, a counter-weight safety valve. This technology was still used in industries a few decades ago. It is now banned beyond 0.5 bar as it is possible for a third party to intervene on the setting in a fortuitous way.





In 1690, Denis Papin built the first steam engine in England by introducing the fluid under pressure into a cylinder with a sliding piston, thus recovering mechanical energy usable for industrial purposes. The story was on the move. Follow the steam engines of Thomas Savery (1698), Thomas Newcomen (1712) and finally that of James Watt (several evolutions between 1763 and 1788) which is one of the pillars of the industrial revolution. One of the last two copies in perfect condition is located in the city of Fumel (Dordogne, France).


The thermodynamism


In 1824, a young physicist named Sadi Carnot (France, 1796-1832) laid the groundwork for thermodynamics in his book "Reflections on the driving power of fire and on the machines to develop this power". William Thomson (England, 1824-1907), better known by the name of Lord Kelvin, will formally define the outlines. It is on these bases that the first calculations of safety valves were to be able to be seen.



The adjusting ring and the full lift


When dealing with the safety valve itself, one of the major revolutions was undoubtedly the invention of the concept of the accumulation chamber by Charles Ritchie (filing of the patent in Aberdeen on 2 March 1848, as a result of his work on the improvement steam locomotives). It is based on the expansive properties of the gases. The principle is as follows: When the pressure reaches the sealing limit of the range, the gas accumulates in a chamber formed between the seating area and a lip. This creates a second compression chamber (after the one in the nozzle) so that it increases the support surface under the disc to a point where this additional force helps to obtain a sudden and significant lift. This technical approach is taken up today through the spring-loaded safety valve adjustment ring type API STD 526. Sudden and significant lifting prevents the valve chattering phenomena at the same time as it preserves the nozzle and the disc. In fact, at the fastest and higher the disc rises, at the most it limits the phenomenon of erosion on the seating area due to the high velocity of the fluid when the two seats are close (beginning of opening). In addition, the quicker and higher is the lifting of the disc, at the fastest is the obtaining a significant flow favorable to the stability of the opening cycle. This is especially true for the steam. Here we understand the whole point of this innovation of the time of the first steam engines, where the contribution of the calories generated by the flame was probably difficult to control and therefore the cases of overpressure probably recurring.

You know a bit of history to add above, please share with us here.

Foundation of some internationally known brands


  • 1818 - Hamburg-Neustadt - Germany (Leser): Foundry of Mr. Georg Wittmann. It will become a general mechanics workshop in 1833. The first safety valve of the company is created in 1856.
  • 1835 - London - England (Dewrance): Founding of the company by Joseph Woods and John Dewrance. It was manufacturing steam boiler items. It has created a special boiler safety valve design, many times copied since. The company has been redeemed and split since. Nowadays the name only exists by a range of isolation valves.
  • 1843 - Huddersfield - England (Hopkinsons): The company was founded by Joseph Hopkinsons. It made valves from BS standards. It is important to remember the so-called torsion bar design used on boiler applications. Today the brand is no longer known for its range of pressure relief valves but only for its production of isolation valves part of the Weir group.
  • 1848 - Lille - France (Sarasin): Foundry and general mechanics workshop of Mr. Deschamps which later became the company Defays and Sarasin (1905) then Sarasin & Cie (1921). First counterweight safety valve built under Maurice licence. Will follow the first spring-loaded safety valves with a home-made design. The brand merged with the RSBD range (Robinetterie Sebim Bouttevin Dubost) during the period under the control of the Sebim group. The latter was redeemed by the Weir group in 1998.
  • 1849 - France (Sapag): Creation of a foundry and a general mechanics workshop by Henry Basset. The company will have several names to lead to Griss-Sapag before being bought by the Tyco group. It manufactured equipment for the sugar industry. Its first industrial valves are delivered in 1920 after reconstruction of the Ham factory destroyed after the war. The manufacture of safety valves began under Consolidated licence in the 60's, before developing its own SV brand in the mid-70. The company was acquired by the Tyco Group in 1999. Now a brand of the Emerson group.
  • 1872 - Mannheim-Waldhof - Germany (Bopp & Reuther): Carl Reuther and Carl Bopp founded a company manufacturing pumps and industrial valves.
  • 1874 - Boston - Massachusetts - USA (Crosby): Today a brand of the Emerson group.
  • 1874 - Germany (Sempell): Today a brand of the group Emerson.
  • 1879 - Lynn - Massachusetts - USA (Consolidated): Edward Ashcroft, a neo-manufacturer of pressure gauge (technology acquired on the basis of a meeting with the French inventor Eugène Bourdon), created a company to manufacture safety valves. It will be sold to Henry S. Manning, Eugene, L. Maxwell and Charles A. Moore who renamed the company in MMM. It was subsequently acquired by Dresser Industries in 1964. It was bought by GE in 2010.
  • 1924 - Milan - Italy (Carraro).
  • 1936 - Japan (Fukui Seisakusho).
  • 1946 - Milan - Italy (Besa).
  • 1947 - Houston - USA (Anderson & Greenwood): Creation of the company by Ben Anderson, Marvin Greenwood & Lomis Slaughter Jr for the construction of a light aircraft that never passed the prototype stage. They changed their goals. Through the provision of fluid control services in the defence missile industry, they developed a brand new safety valve technology: the piloted version. It met with immediate success, particularly in oil and gas applications in the Gulf of Mexico, due to its weight and volume gain, and its low maintenance cost compared to spring-loaded valves. Now a brand of the Emerson group.
  • 1950 - (ARI Armaturen): Foundation by Albert Richter on the production base of cast iron valves.
  • 1951 - Milan-Italy (AST).




The industrial valvesare used in various shapes, in different applications, in different sizes and materials. Even though some valve types may seem technically and dimensionally basics, it is nonetheless essential to know how to select, use and repair them.


In fact every type of industrial valves:

  • Is often dedicated to a very specific purpose.
  • Has a strictly defined installation mode.
  • Must be maintained according to specific methods.
  • Must be tested according to current standards and regulations.


PRV Support sets up personalised training according to the participants profiles. From the simple understanding of the terms used and the types of industrial valves to the sizings and selections of pressure relief devices on complex applications (dual phase process, corrosive fluids, different temperature types on the same service, etc.) through the installations and maintenance phases, each actor needs to master the requirements of his own job. What about the regulations and standards when they impose constraints that can have serious finacial consequences if they are not known and under control upstream the emission of the needs.


Without going so far as to talk about the risks control about industrial accidents, the simple fact of sizing, selecting, installing, using and maintaining valves has a significant impact on the proper functioning of Industrial equipment. Each actor is sensitised about the good performance of the equipment and the low impact on the environment. A valve organ may, if poorly selected, misused or poorly maintained, cause leakage, fugitive emissions and also unexpected unit shutdowns for safety reasons.


PRV SUPPORT offers theoretical and practical trainings. They can be implemented according the customer requirements and priorities. Several existing training modules allow to achieve the training sessions whatever the participant profils.

Sizing, operating, selection, storage, commissioning

Operating, storage, troubleshooting, maintenance

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Fundamentals of the industrial valves (ref FT1)



Trainings examples. Please ask us in order to prepare a training program according to your qualitative and budgetary criteria.

  • Main industrial valve types : design, strengh & weakness
  • Main codes and standards
  • Industrial fittings
  • Metallic and soft materials

This training program gives an overview of all the main aspects of the industrial valves. As such the participant will be able to understand and participate to any general discussions about the industrial valves (daily business purpose, understanding of other trainings at higher level, junior level, etc.).


Required level : junior

Fundamentals of the pressure relief valves (ref FT2)

  • Introduction to overpressure protections
  • Operating of the pressure relief valves
  • Main troubleshooting issues

This training allows to understand the main wordings and requisitions. The participant will be able to understand an intermediate level discussion (exchange with specialists, particpate to higher level trainings, etc.).


Required level : junior + training FT1 understood

Sizing and selection of the pressure relief valves (ref FT3)

  • Reminder about fundamentals from the main codes and standards
  • Sizing of the pressure relief valves (gas, liquid, process steam and steam boiler)
  • Selection of the pressure relief valves
  • Troubleshooting issues and alternative solutions

This training allows to understand ho to size and select, which are the difficulties and traps and how to by-pass the obstacles. Above all it allows the understand the stakes of the safety on site, as well as to know how to select the best technico-economical solutions according the needs.


Required level : junior + trainings FT1 + FT2 understood



Maintenance of the pressure relief valves (ref FP1)


  • Required technical means (according the end-use market)
  • Required safety measures
  • Maintenance methods (phases, documentation, records)
  • Dismantling, inspection, interpretation of damages, lapping, cleaning, assemblying
  • Use of genuine parts
  • Setting and testing (gas & liquid)

A good maintenance operation is not to only test a pressure relief valve without a thorough inspection of all components. This is a crucial operation, not only to prevent the risk of incident on site, but also to anticipate the supply of certain components for a future service. 

This also makes it possible to check whether the valve has been subjected to inappropriate conditions in order to allow the proposal for corrective actions.

The practical training is set according to the customer needs : cryogenics service, oxygen service, steam service, etc.


Required level : Junior + theoretical trainings FT1 & FT2 understood



  • Assistance during the commissioning phase: checking of handling methods, pressure relief valve conditions visual inspection, test methods and possibly installation (according to safety rules on site), audit of the test and overhaul means at site.
  • Assistance during the start-up phases: interpretation of failures.
  • Service centre audit.


  • Support for the establishment of specifications for pressure relief valves (data sheets, requisitions, documents to be filled in by the bidders / suppliers, etc.)
  • Support for pre-sizing and selection of the pressure relief valves (final sizing by the selected manufacturer).

In general, PRV Support accompanies you in the process of determining and supplying your pressure relief valves.



The expertise after an incident (even light) or a disaster requires professional skills that cannot be improvised.


Our years of experience, both with the design offices and the service centres and yards, allow us to have an overall view of the most frequent errors associated with the use of pressure relief valves. Of course, it all starts with a perfect knowledge of the products in their applications.


PRV Support accompanies the various players in the industrial sectors and delivers diversified services both in France and internationally. The know-how and experience of PRV Support enables us to meet the needs of risk assessment and expertise after an event related to the use of pressure relief valves.




PRV Support is the local partner of global companies working with the same values: strong and recognised expertise and commitments achievement.


  • DECON Technologies (India) : supply chain solutions, engineering services, manufacturing / assembly / supply of finished flow control products.



DECON Technologies


DECON Technologies is an Indian company, founded in 2014. The owners have a combined experience over sixty years.


DECON Technologies fournit les services suivants :

  • Supply chain of metallic or soft material parts.
  • Engineering service, new product development
  • Manufacturing, assembly or supply of complete flow control products.