Elaflex BlueSpot ERV-BR Rubber Bellows


The Elaflex BlueSpot ERV-BR rubber bellows features a BR/NR, seamless, high abrasion resistant liner with Polyester textile cord and BR/NR cover. Suitable for abrasive media, sludges, slurries, emulsions, solid/liquid mixtures and powders, Carbon Black. The BlueSpot ERV-BR is available from DN25 to DN300 with a wide choice of configuration, flange and restraint options:

PRODUCT GUIDES

Elaflex Rubber Bellows

What is an Elaflex ERV-BR Rubber Bellows?

For abrasives, powders...

  • Materials
    BR/NR, swivel flanges as standard in zinc plated carbon steel.
  • Application
    Abrasive media, sludges, slurries, emulsions, powders.
  • Rating
    PN16 to DN300, -50°C up to +90°C, temporarily up to +100°C. Electrically dissipative.
  • Approvals
    DNV.

How to select an Elaflex rubber bellows


1 Temperature & Pressure2 Rubber Compatibility3 Diameter and Length4 Flange Drilling & Restraints5 Movements6 Let us help
Elaflex 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.
Elaflex 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.
Elaflex 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.
Elaflex 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.
Elaflex bellows MovementsMoulded 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.
Elaflex 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

BlueSpot ERV-BR standard restraint options:


FlexEJ has tie rod restraint options in stock for the BlueSpot ERV-BR bellows range. Angular and other configurations can be engineered to your exact requirements, however complex:

Without Restraints
(Untied)

Untied Elaflex rubber bellow

WITHOUT RESTRAINTS
No movement restriction, pressure force acts on pipe

The bellows will exert a pressure force on the pipe (see FAQ) as the bellows tries to elongate which must be absorbed at the piping anchors. Any equipment connected to the bellows must have an adequate flange load rating.

Tie rods with outer nuts
(Tied)

Elaflex Outer Tie Rods

TIE RODS WITH OUTER NUTS
No axial extension, pressure force restrained

Tie rods with outer nuts only restrict the elongation of the bellows under pressure and restrains the pressure force. Up to DN300 the tie bars lie elastically in noise-reducing rubber bushes of weatherproof rubber, from DN350 steel spherical washers are provided. The bellows can move laterally. Axial compression is also possible but only if the piping overcomes the pressure force.

Tie rods with inner and outer nuts
(Lateral only)

Elaflex Outer Tie Rods

TIE RODS WITH INNER AND OUTER NUTS
No axial extension or compression, pressure force restrained

Tie rods with inner and outer nuts both restrict the elongation of the bellows under pressure (restrains the pressure force) and limits axial compression. Up to DN300 the tie bars lie elastically in noise-reducing rubber bushes of weatherproof rubber, from DN350 steel spherical washers are provided. The bellows can move laterally. Axial compression is also possible but only if the piping overcomes the pressure force and a gap is set between the inner nuts and the flange.

Hinges
(Angular only)

Elaflex Angular Limiter

HINGES
Angular movement only, pressure force restrained

The hinge restricts bellows movement to angular only. The pressure force is restrained by the hinge. No axial or lateral movement is possible. Two hinged bellows working together can form a very effective restrained lateral joint with low spring rate capable of very large movements.

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

BlueSpot ERV-BR comparison chart


Is the BlueSpot ERV-BR the best option for your application? Three 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. 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.
Q. Are your Elaflex bellows available to purchase directly online?
A. The ERP Redspot, ERV-R Redband and Rotex DoubleRed bellows are now available from FLEXEJDIRECT from stock for the most common sizes and configuration of these popular high-quality bellows. The shop items and can be despatched same day (Monday to Thursday) on a 24hr service if in stock. More advanced configurations and the other nine Elaflex bellows ranges are available to assemble to exact specifications and typically take 7-10 days (depending on size, quantities and configurations required).

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.
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