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:
HVACUnion Ends
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
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.
The 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.
Moulded 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.
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.
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.
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 Rubber Bellows
FlexEJ has the following ranges of HVAC Rubber Bellows available:
HVAC flanged rubber bellows
DN32 to DN250
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
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
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.
HVAC rubber bellows comparison chart
Which HVAC rubber bellows is the best option for your application? Four 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?
DIN 4809 compliant HT Heating Water DIN4809 compliant
Is this bellow compliant with the German DIN4809 standard of approval for warm water heating systems? (Max 100°C, 10 bar).
Rating barg/°C Pressure & temperature
What is the required pressure rating (in barg) compared to temperature rating for this bellow?
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.
