HVAC Metal Bellows
Metal bellows specifically designed for HVAC applications in a range of styles to suit your piping
HVACCopper Ends
HVACUnion Ends
HVACShort Axials
HVACLong Axials
HVACPump Bellows
HVAC Metal Bellow
What is an HVAC Metal Bellow?
High temperature design with flanged, copper or union ends...
- Design
Extensive range of metal bellows suitable for a wide range of HVAC services. - Performance
High quality bellows manufactured in 316 stainless steel. - Application
Potable water, heating water, steam. - Web Shop
Available online with next day delivery from our web shop.
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 HVAC Metal Bellows
FlexEJ's has the following ranges of HVAC Metal Bellows available:
HVAC Copper End metal bellows
DN12 to DN150
HVAC COPPER END METAL BELLOWS
EN1057 Table X copper ends
FlexEJ's copper ended bellows are WRAS approved for drinking water. Minimum length designs for axial compression with 316 stainless steel bellows rated at 6 Barg @ 90°C
HVAC Union End metal bellows
DN12 to DN50
HVAC UNION END METAL BELLOWS
EN10242 Female union ends
Union ended bellows. Minimum length designs for axial compression with 316 stainless steel bellows rated at 6 Barg @ 150°C
HVAC Long Axial bellows
DN32 to DN400
HVAC LONG AXIAL BELLOWS
EJMA calculated punch formed bellows
FlexEJ's Long Axial range offer large axial movements. Stainless Steel 316 bellows, designed to EJMA, manufactured by punch forming. Minimum overall length design with PN16 carbon steel flanges. These expansion joints are rated for applications up to 16 Barg @ 180°C.
Short Axial metal bellows
DN32 to DN250
SHORT AXIAL METAL BELLOWS
EJMA calculated punch formed bellows
FlexEJ's Short Axial range offer moderate axial movements and are consequently shorter overall. Stainless Steel 316 bellows, designed to EJMA, manufactured by punch forming. Minimum overall length design with PN16 carbon steel flanges. These expansion joints are rated for applications up to 16 Barg @ 180°C.
HVAC Pump bellows
DN50 to DN400
HVAC PUMP BELLOWS
EJMA calculated punch formed bellows
FlexEJ's Pump range offer small lateral movements suited to pump alignment and vibration applications. Available as tied and untied. Stainless Steel 316 bellows, designed to EJMA, manufactured by punch forming. Minimum overall length design with PN16 carbon steel flanges. These expansion joints are rated for applications up to 16 Barg @ 180°C.
HVAC flanged axial bellows comparison chart
Which is the best flanged metal 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.
