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IMF production workshop: technicians at machining and assembly stations

Case study · 12 September 2026

A custom pressure regulator,
from catalogue model to customer site.

An operator of hydrogen refuelling stations for heavy vehicles needed a pressure regulator that could deliver stable pressure from 700 bar storage outdoors at temperatures down to −40 °C. No catalogue model met all the requirements.

We started with the D973, our high-pressure regulator, rated for 700 bar inlet pressure with BSPP connections and 1,000 bar with 3/8″ OD SFX. We adapted it to low temperatures, the station’s pressure cycles and hydrogen leak-tightness requirements.

The specification.

Parameter	Requirement
Fluid	Gaseous hydrogen
Inlet pressure	700 bar
Ambient temperature	Down to −40 °C, outdoor installation
Body	316L stainless steel
Leak tightness	Int. 10⁻³ · ext. 10⁻⁴ mbar·l/s, helium
Upstream filtration	10 µm

Five steps, fourteen weeks.

Review the requirements with the operator and select the D973 as the starting model.
Adapt the materials: 316L body, PCTFE seat and seals qualified for low temperatures.
Machine and assemble the prototype in Andilly.
Test helium leak tightness, pressure cycling and cold resistance.
Complete site acceptance with the operator and hand over the documentation.

IMF technician in a safety vest inspecting a test bench in the workshop — Helium leak testing at the Andilly workshop.

“Starting with a proven model let us focus on the two main changes: cold conditions and pressure cycling.”
IMF engineering team

What we learned

Using a catalogue model as the starting point significantly shortens qualification.
Cold conditions affect the choice of seals and seat as well as the body.
Helium testing each component verifies hydrogen leak tightness.

Documents supplied

On request, we prepare 3.1 material certificates, a helium leak report for each component and the PED declaration of conformity during manufacturing and include them with the order.

Good to know

Air Liquide CTE tests a version for oxygen and medical gases. Mention your requirements when you enquire so that degreasing and the cleanliness certificate can be prepared during manufacturing.

Case study: 700 bar hydrogen pressure regulator (test)PDF · 2.2 KBDownload

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An industrial SME in Andilly

Since 1964, IMF has designed and manufactured pressure regulators, valves and safety relief valves for industrial gases, hydrogen, nuclear and defence applications.

About IMF

Six demanding sectors

Extreme pressures, reactive fluids and regulated markets. Each sector has its own constraints, standards and typical designs.

Our applications

Workshop

Machining, assembly and testing under one roof.

Engineering and production work side by side from drawing to test report.

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IMF engineers talking on the workshop floor

Choose by fluid

Air, nitrogen, helium, oxygen and hydrogen each require suitable materials, seals and precautions.

Read the guide

Flow, Kv and sizing

Manufacturer flow rates are specified for air under sonic flow conditions. For another gas, apply a correction based on density.

Read the guide

Cleanliness, degreasing and oxygen

For degreased and oxygen versions: procedure, cleanliness class and packaging.

Read the guide

The factory

Designed and made in
Andilly since 1964.

Design, machining, assembly and testing under one roof: 1,750 m² in Andilly, 20 km from Paris.

Every component is marked, traceable to its configuration and helium-tested before it leaves the factory.

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Expertise: 60+ years
Operating pressure: 0 – 1 100 bar
Temperature range: −270 / +200 °C
Customers: 300+ in 65 countries

Engineering
We assess pressure, temperature and fluid, then recommend materials and a configuration, from a standard component to a custom assembly.
Testing
Actuated and manifold assemblies are function-tested in our workshop. The test report accompanies the order.
Support & audits
We carry out on-site audits to identify energy losses and likely failures, and provide support long after installation.

Quality management
ISO 9001:2015
The quality management system covers design, purchasing, machining, assembly, testing and after-sales service.
PDF certificate
Pressure equipment
DESP 2014/68/UE
Pressure equipment placed on the European market: categories, conformity assessment and CE marking.
EU declaration
Explosive atmospheres
ATEX 2014/34/UE
Equipment for explosive atmospheres. Specify the zone and we will propose a compliant design.

Milestones

Six decades and key milestones.

1948
The group's origins
AUXIM starts manufacturing pneumatic valves and enters the railway market in 1955.
1964
IMF is founded
High-precision pressure regulators for industrial gases in Andilly.
1965
Naval defence
First hydraulic and pneumatic control systems for submarines and surface vessels.
2000
PET blow moulding
The start of more than twenty years of blow-moulding components, now used on four continents.
2024
IMF International
IMF joins the group formed by merging fluid control manufacturers.

Documentation

What comes
with the equipment.

Available on request and archived with the order. Specify the documents you need when you enquire, so we can compile them during manufacture.

Material certificates: 3.1 certificates for bodies and wetted parts in brass, stainless steel, aluminium bronze, Monel and Inconel.
Leak test report: Internal and external helium test record for each component, with its serial number.
Declarations of conformity: EU declaration under PED or T-PED, depending on the application, with CE marking and category.
ATEX zone statement: Declaration of the zone and the compliant design supplied.
Functional test report: For every actuated or manifold assembly: cycles, setpoints, results and operator.
Cleanliness certificate: For degreased and oxygen versions: procedure, cleanliness class and packaging.

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Body and internal materials

Brass or 316L stainless steel body, depending on the fluid. Select poppet inserts and seats for the fluid and pressure: PCTFE, PEEK, Torlon, Monel, stainless steel or copper.

Brass
316L stainless steel
PCTFE
PEEK
Torlon
Monel

Outlet pressure ranges

This panel can contain a paragraph, list, table or button. See the product data sheet for each model’s pressure ranges.

Available connections

This panel can contain a paragraph, list, table or button. For example: BSPP, NPT or OD SFX connections, depending on the series.

Leak tightness and testing

This panel can contain a paragraph, list, table or button. For example: helium leak testing of each component before shipment.

Technical FAQ

Frequently asked questions
about H₂ regulation.

Common questions from integrators, engineering teams and operators. For more help, an engineer will take up your request within 24 hours.

Ask your question

What is the minimum leak-tightness requirement for a hydrogen pressure regulator?

For hydrogen we target internal leakage of 10⁻³ mbar·l/s and external leakage of 10⁻⁴ mbar·l/s, measured using helium on every component. The leak test report can accompany the order with the serial number.

How do you choose between a spring-loaded and a dome-loaded hydrogen pressure regulator?