FlexEJ HVAC Union End Rubber Bellows
FlexEJ’s HVAC-suitable BSP Union End Rubber Bellows from stock, next day delivery. Also from our web shop.
24hr Shipping
On all stock items ordered.
Mon-Thur by 2pm, 10am Fridays
Design & Manufacturing
Full in-house design & manufacture to EN / ASME / PED.
ISO14001 Accreditation
FlexEJ has an accredited Environmental Management System.
Union End Rubber Bellows
FlexEJ’s Value Union End BSP rubber bellows are ideal for smaller diameter applications at lower temperatures and pressures where WRAS drinking water approval is not required.Â
HVAC BSP Union Ends
HVAC BSP Union Ends
HVAC BSP Union Ends
HVAC BSP Union Ends
HVAC BSP Union Ends
HVAC BSP Union Ends
HVAC BSP Union Ends
Available in lengths of 200mm (240mm at DN65) all with BSP Unions, DN20 to DN65:
PRODUCT GUIDES
HVAC RUBBER EXPANSION BELLOWS
WHAT IS A HVAC UNION-END RUBBER BELLOW?
VALUE CHOICE FOR LOWER TEMPERATURES..
Materials
EPDM with galvanised cast iron unions.
Application
Water: LT heating, waste, sanitary, chilled.
Rating
PN10 at +20°C and PN06 at +95°C. BSP Unions.
APPROVALS
Not approved for drinking water.
HVAC UNION END RUBBER BELLOWS
| SIZE | LENGTH | PRESSURE RATING | MOVEMENT | IN SHOP |
|---|---|---|---|---|
| DN20-¾” | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
| DN25-1″ | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
| DN32-1¼” | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
| DN40-1½” | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
| DN50-2″ | 200mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
| DN65-2½” | 240mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
| DN80-3″ | 240mm | 10 Barg @ 20 ºC to 6 Barg @ 95 ºC | Axial +22/- 6 mm, Lateral +/- 22 mm, Angular +/- 45º | Yes |
How to select a HVAC Union End rubber bellow
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.
FlexEJ's HVAC Union End Rubber Bellows
FlexEJ’s HVAC Union End rubber bellows offer excellent value for many small bore building services applications:
| Â BSP Unions | EPDM rubber lining |
| All metal parts galvanised | In stock for quick delivery |
| Twin sphere design | Swivel connections |
Specifications
All sizes available from the web shop…
For detailed specifications please see our catalogue.
HVAC Union-End Rubber Bellows Finders and Calculators
We have a couple of easy to use tools and calculators to help you find the best HVAC Union-End Rubber Bellows from our next-day delivery stock items. Our Thermal Expansion Calculator for Piping helps you estimate the increase in length of a pipe run with temperature. Our Advanced Bellows Finder is a quick way to navigate our stock range of bellows, both metal and rubber. With just a few choices you can arrive at the appropriate selection – criteria include pipe size, type, media compatibility, installation length, pressure rating, pipe connection type, conformance and movement axial, lateral and angular. All the products are in the online store with 24hr shipping as standard. If you’re not sure what flange you need our handy Flange Finder should also be useful.
Stock HVAC Union-End Rubber Bellows Finder
Do search for our BSP union-end rubber bellows by pipe size, intended media and/or connection hardware to see FlexEJ’s stock bellows options below but don’t hesitate to call us on 01384 881188 or email us for more bespoke or OEM options or if you need any advice at all.
Can't quite find the right bellow?
Try our Advanced Bellows Finder
Or call our expert team on +44 (0) 1384 881188. We'll be glad to help.
HVAC Union-End Rubber Bellows comparison chart
Is the HVAC Union End rubber bellows the best option for your application? Two potential alternatives to consider:
WRAS approved 
WRAS approved bellows
Is this bellow approved for use in all UK public mains water supplies?
Potable water Potable water
Is this bellow approved for water systems used for drinking and food preparation?
Rating barg/°C Pressure & temperature
What is the required pressure rating (in barg) compared to temperature rating for this bellow?
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
Frequently Asked Questions
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.
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.
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.
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.
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.
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.
A. Yes, our Elaflex ERV-R and ERP rubber bellows have WRAS, DVGW and ACS approval for drinking water, see our Elaflex pages for more information. 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.