FlexEJ Products People

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.

HVAC Metal Bellows

Metal bellows specifically designed for HVAC applications in a range of styles to suit your piping:

How to specify a metal expansion joint

Metal bellow engineeringWe 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.

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

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
Coming Soon

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

Axial metal bellows

DN50 to DN150
Short Axial metal bellows

AXIAL METAL BELLOWS

EJMA calculated punch formed bellows
FlexEJ’s Short Axial range offer moderate axial movements and are consequently shorter overall. Stainless Steel 321 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 10 Barg @ 110°C.

HVAC Pump bellows

DN50 to DN150
HVAC Pump bellows

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 321 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 10 Barg @ 110°C.

HVAC Metal Bellows Finders and Calculators


We have a couple of easy to use tools and calculators to help you resource the best HVAC metal 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 the full range of on-line metal and rubber expansion bellows and joints – with 24hr delivery across the UK. 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 Metal Bellows Finder

Do search for HVAC Metal expansion joints by pipe size, intended media and/or connection hardware to see FlexEJ’s stock of next-day deliverable metal bellows options but don’t hesitate to call us on 01384 881188 or email us for more bespoke options, sizes and restraint configurations or technical advice.

DN12 (½″) FlexEJ 15 mm Copper Pipe Expansion Joint - Length 220 mm
DN12 (½″) FlexEJ 15 mm Copper Pipe Expansion Joint – Length 220 mm
DN12 (½″) FlexEJ Union Pipe Expansion Joint - Length 181 mm
DN12 (½″) FlexEJ Union Pipe Expansion Joint – Length 181 mm
DN20 (¾″) FlexEJ 22 mm Copper Pipe Expansion Joint - Length 230 mm
DN20 (¾″) FlexEJ 22 mm Copper Pipe Expansion Joint – Length 230 mm

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

HVAC & Industrial Bellows Comparison Charts


What is the best pump or axial bellow for your application? Four potential alternatives to consider:

HVAC
Pump
Bellows
HVAC Pump Bellows

10/110°

View

Industrial
Pump
Bellows
Industrial Pump Bellows

16/180° to 12/300°

View

HVAC
Axial
Bellows
HVAC Axial Bellows

10/110°

View

Industrial
Axial
Bellows
Industrial Axial Bellows

16/180° to 12/300°

View

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. We 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. In addition, FlexEJ holds a large stock of the most popular sizes and types of Elaflex rubber bellows as well as our HVAC value bellows range.

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. Yes, FlexEJ has full design capability for engineered metal expansion joints and can work to any recognised standard – typically EJMA, B31.3/Appendix X, EN14917 plus PED and/or other customer specifications. Engineered rubber expansion joints are typically designed to meet the FSA guidelines plus PED and/or other customer specifications For technical assistance please contact us or use the Live Help link on this page.

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 MRCA copper ended metal expansion joints also have WRAS approval. We laso have DWI approval for stainless steel expansion joints. 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.