Metal Bellows
FlexEJ offers a range of standard metal expansion joints as well as a full UK in-house manufacturing capability - typically to EJMA/B31.3/PED. Diameters from 25mm to 2500mm, design to specification.
HVACMetal Bellows
IndustrialMetal Bellows
PharmaceuticalMetal Bellows
ManufacturedMetal Bellows
Metal Bellows
What is a metal bellows expansion joint?
Off the shelf to full design and manufacture...
- Design
Extensive range of stock/configurable metal bellows and fully engineered expansion solutions. - Performance
High quality EJMA calculated bellows manufactured by punch forming in stainless steels, Nickel alloys, Exotics. - Application
FlexEJ are here to help from concept through to project delivery . - Projects
Full documentation, certification, NDT and engineering support.
How to specify a metal expansion joint
We design and manufacture metal expansion joints so you are not restricted to our range of standard products, some of which are available in our web shop. For simpler applications a standard product may be entirely suitable but if not we will design to meet your exact requirements.
Metal bellows have a defined fatigue life based on movement cycles. Understanding the movements, if they are concurrent or not and the realistic number of times the movements can occur is fundamental to metal bellows design.
Metal bellows work well up to around 500ºC, above that we use insulation to control the actual bellows metal temperature if the media is above this temperature. Pressure and temperature must be known to select a metal expansion joint.
The most common material used for metal bellows is Stainless Steel - 304, 321, 316 - and for more demanding applications Nickel Alloys - 625, 800, 825. Corrosion is the most likely failure mode for the bellows itself so the correct material selection is important.
Our standard ranges have set lengths for each diameter / movement range but we can design to meet your exact requirements. Making the bellows longer will increase the available movement. Most commonly a flange, we can provide to any specification, or pipe weld ends. Our HVAC standard product is available with BSP Union ends and Copper Pipe ends. If you are uncertain about what flange type you already have installed our Flange Finder will help you identify it.
Call our expert team on +44 (0) 1384 881188 or email us at sales@flexej.co.uk or use Live Chat on this web site - we are here to help, please get in touch.
FlexEJ's Metal Bellows Expansion Joints
FlexEJ has the following ranges available which cover all applications from simple HVAC up to refinery, power and nuclear:
HVAC metal bellows
DN12 to DN400
Industrial metal bellows
DN100 to DN400
INDUSTRIAL METAL BELLOWS
Fully Configurable
FlexEJ's industrial metal bellows range is based around high performance bellows designed to EJMA and is fully configurable. You can then specify any flange type and material or weld end pipe type and material plus any end-to-end length within the design range. Rated up to 12 Barg @ 300 °C and backed by our engineering team.
Pharmaceutical bellows
DN100 to DN500
PHARMACEUTICAL METAL BELLOWS
Aseptic Self Draining
FlexEJ's pharmaceutical metal bellows design allows metal bellows to be deployed in lines that must be fully cleaned and aseptic. Self draining and manufactured from high surface finish stainless steel.
Metal bellows manufacturing
DN25 to DN2500+
MANUFACTURED METAL BELLOWS
Full design to EJMA/B31.3 or EN14917
FlexEJ design and manufacture fully engineered expansion joints. We work to all international codes and in materials to suit all applications including CrMO, Duplex 625, 800 and 825. Tied, hinged, gimbal, pressure balanced, refractory lined, liners, covers, single and multi ply and two ply testable bellows - we have the experience.
HVAC and Industrial bellows comparison chart
What is the best pump or axial bellow for your application? Four potential alternatives to consider:
Stainless steel bellow 
Bellows Material and Design
Is the bellows Stainless Steel and calculated to EJMA?
Flow Liner Flow Liner
Is a Flow Liner included?
Any flange / weld end Any Flange or Weld End
Is any common flange type or pipe weld end available?
Range of lengths Range of lengths
Can an overall length greater than minimum be specified?
Rating barg/°C
Industry experience
FLEXEJ Ltd was formed in 2002 by two professional engineers who brought together an already highly respected design capability with business and commercial skills gained in large multinational companies.- Our focus has always been on application and design – helping our customers find the best value solution.
- We have a strong engineering and manufacturing team with experience in petrochemicals, refining, nuclear, desalination though to HVAC.
- The team is also very familiar with meeting complex requirements for documentation, in process NDT and test on projects. We have supplied many large end-users such as EDF, Exxon, Shell, Reliance & QatarGas working with major contractors such as JGC, Foster Wheeler & Technip.
