HVAC Rubber Bellows


Designed for water applications in building services. FlexEJ offers two ranges for this market : our value HVAC range which is suited to lower temperatures and pressures and the Elaflex range which features WRAS approval, high temperature durability and many more options:

PRODUCT GUIDES

HVAC Rubber Bellows

What is an HVAC Rubber Bellows?

Ideally suited to water applications and building services...

  • Materials
    EPDM with carbon steel flanges or cast iron unions.
  • Application
    Water: drinking, LT and HT heating, waste, sanitary, chilled with tied or untied flanges or unions.
  • Rating
    Wide range to suit all applications PN10, PN16 and temperatures to +130°C.
  • Approvals
    WRAS (Elaflex ERV-R, ERP)

How to select an HVAC rubber bellows


1 Temperature & Pressure2 Rubber Compatibility3 Diameter and Length4 Flange Drilling & Restraints5 Movements6 Let us help
HVAC Rubber bellows Temperature & Pressure Temperature is the most critical as it directly influences the choice of rubber - but also the actual pressure capability of the bellows. The stated maximum rated pressure is maintained up to around 50ºC for most rubber bellows, for higher temperatures check the data in the Range tab.
HVAC Rubber bellows Rubber CompatibilityThe rubber compound used for the inner layer of the bellows must be compatible with the working fluid. Drinking water requires a WRAS approved EPDM, oils require Nitrile and so on - our Bellows Finder can help you with finding the right rubber.
HVAC Rubber bellows Diameter and LengthMoulded bellows are manufactured in set combinations of diameters and lengths. However, our handmade Safetech range can be manufactured in any diameter and length to suit your application, only the more standard sizes are shown on the Safetech range tab.
HVAC Rubber bellows Flange Drilling & Restraints Any flange drilling can be supplied; if you are uncertain about what you already have installed our Flange Finder will help you identify it. The HVAC and Elaflex ranges have swivel flanges; the Safetech range has full face rubber flanges. Our web shop stock is PN10/16. Bellows will exert a pressure force on the pipe (see FAQ) which must be restrained or absorbed at the piping anchors. All our flanged rubber expansion joints are available with tie rods and we can offer hinges or gimbals on the Elaflex and Safetech products.
HVAC Rubber bellows Movements Moulded rubber bellows have a defined movement range, which is shown for each type in the Range tab, movements listed are non-concurrent (see FAQ). A Safetech bellows will be designed to meet your required movements.
HVAC Rubber bellows Help 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.

Can't see what you want? Need help?

Call us. Or use Live Chat.

For instant advice. We can custom-design and engineer almost any expansion joint you need for delivery in the UK or worldwide. Call our expert team on +44 (0) 1384 881188. Or email us sales@flexej.co.uk

FlexEJ's HVAC Rubber Bellows


FlexEJ has the following ranges of HVAC Rubber Bellows available:

HVAC flanged rubber bellows
DN32 to DN250

 
HVAC flanged rubber bellows

HVAC FLANGED RUBBER BELLOWS
When a value HVAC bellow will meet your requirements

FlexEJ's Value Flanged rubber bellows are ideal for applications at lower temperatures and pressures and where WRAS drinking water approval is not required. Available in lengths of 106, 130 and 150mm (200mm at DN250) all flanged PN16, tied or untied, DN32 to DN250. All of these are available from our web shop on 24 hour delivery.

Union end rubber bellows
DN20 to DN65

 
Union end rubber bellows

UNION END RUBBER BELLOWS
EPDM rubber with galvanised cast iron BSP union ends

FlexEJ's Value Union rubber bellows are ideal for smaller diameter applications at lower temperatures and pressures and where WRAS drinking water approval is not required. Length of 200mm (240mm at DN65) all with BSP Unions, DN20 to DN65. All of these are available from our web shop on 24 hour delivery.

Elaflex HVAC Rubber Bellows
DN25 to DN1000

 
Elaflex HVAC Bellows range

ELAFLEX HVAC BELLOWS
RedSpot, RedBand and Rotex

The Elaflex range, manufactured in Germany, offers three types of rubber bellows designed for HVAC services. RedSpot is a highly flexible low pressure design with WRAS approval; RedBand is also WRAS approved and designed for higher pressures and temperatures; Rotex is a DIN4809 approved rubber bellows designed specifically for high temperature services. All Elaflex rubber bellows are available with a wide range of flange drillings, tied or untied. All three Elaflex ranges with PN16 flanges DN25 to DN150, tied and untied, are available with 24 hour shipping from our web shop.

Got a quick question?

Use Live Chat. Or call us.

For instant advice use the Live Chat link to message one of the sales team. Or call them direct on +44 (0) 1384 881188

HVAC rubber bellows comparison chart


Which HVAC rubber bellows is the best option for your application? Four potential alternatives to consider:

Not sure what flange spec you need?

Use the FlexEJ Flange Finder to find out

FlexEJ stock a full range of specs and types for our bellows. Or call our expert team on +44 (0) 1384 881188.

 

Who can you talk to?


Try our sales and customer service team on 01384 881188

They don't bite. And they know what they're talking about. Call the team any time from 9am to 4pm weekdays or use LIVE CHAT if you would prefer a quick text answer. For more complex queries, send us any pro-forma documentation using the get a quote form below or email us sales@flexej.co.uk.

Call Us

Can't quite find the right bellow?

Try the FlexEJ Bellows Finder

Or call our expert team on +44 (0) 1384 881188

Frequently Asked Questions


Q. Do you hold stock of rubber bellows?
A. Yes. FlexEJ holds a large stock of the most popular sizes and types of Elaflex rubber bellows as well as our HVAC value bellows range. We also hold stock of the most popular metal bellows for HVAC. Many of these items are available on 24hr delivery from our online web shop. We can also manufacture to order. For sales assistance please contact us or use our Live Chat facility.
Q. How do you identify flanges?
A. Our Flange Finder contains details for many common flanges. Typically, to be able to make the identification you need to know the bore size or outside diameter and number of bolts. For technical assistance contact us or use our Live Chat facility.
Q. How do you install a rubber bellows or a metal bellows?
A. Please refer to our guidelines for installation, anchoring & guides. They are available in the Downloads section of this website: Elaflex Rubber Bellows Installation Instructions and FlexEJ Metal Bellows Installation Instructions. For technical assistance please contact us or use our Live Chat facility.
Q. What lengths of rubber bellows do you offer?
A. FlexEJ Value HVAC and Elaflex rubber bellows are stocked in a number of standard lengths from 105mm to 300mm, a summary of lengths, diameters and types can be found on each product page. We also offer fully engineered rubber bellows which are available in custom lengths to suit the application. You can use our bellows finder to find the most suitable product. For technical assistance please contact us or use our Live Chat facility.
Q. Can you match another brand / manufacturer of expansion joint or bellows?
A. Yes, if you have the details we can normally offer an equivalent, our FAQ here gives the information we will need for a full selection. For technical assistance please contact us or use the Live Chat link on this page.
Q. What do I need to know to identify an existing expansion joint or bellows?
A. To identify an existing expansion joint we need to know: nominal bore, overall length and flange type plus service, temperature, pressure and required movement if known. Try our Flange Finder to help identify the flange and you can send us a picture of the existing part using the Contact us form. For technical assistance please contact us or use the LIVE CHAT link on this page.
Q. Do you have rubber bellows for drinking / potable water or with WRAS approval?
A. Yes, our Elaflex ERV-R and ERP rubber bellows have WRAS, DVGW and ACS approval for drinking water. The Safetech manufactured to order rubber bellows can be supplied with WRAS approved EPDM linings. Our MRCA copper ended metal expansion joints also have WRAS approval. For technical assistance please contact us or use the LIVE CHAT link on this page.

Please visit our full FAQ page to see all our frequently asked questions.

Need a detailed quote?

Get A Quote. On us.

We will provide full technical details together with, pricing and shipping timescales. For more complex engineered quotes, preliminary sketches and calculations will be available.

Got a quick question?

Use Live Chat. Or call us.

For instant advice use the Live Chat link to message one of the sales team. Or call them direct on +44 (0) 1384 881188

Get A Quote


Please complete the short form here and we'll get back to you within 24hrs Monday to Friday (quicker if marked urgent).

Alternatively, you can also call our expert team directly on +44 (0) 1384 881 118 from 8:30AM to 4:30PM weekdays who will be only too pleased to talk through your requirements and technical queries over the phone.

Visitors are also welcome Monday to Friday although please get in touch beforehand to let us know you're coming.













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    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.
    FlexEJ Industry Experience