Elaflex WhiteBand ERV-W Rubber Bellows
The Elaflex WhiteBand ERV-W rubber bellows features an NBR light grey, seamless, abrasion resistant liner with PA textile cord reinforcement and Chloroprene (CR) cover. Suitable for foodstuffs, also food-grade oils and fats. Not approved for drinking water. The WhiteBand ERV-W is available from DN25 to DN600 with a wide choice of configuration, flange and restraint options:
Elaflex Rubber Bellows
What is an Elaflex ERV-W Rubber Bellows?
For food applications...
NBR light grey, swivel flanges as standard in zinc plated carbon steel.
Food stuffs, oils and fats, not suitable for drinking water.
PN16 to DN400, PN10 to DN600, -20°C up to +90°C, temporarily up to +100°C. Electrically non conductive.
How to select an Elaflex rubber bellows
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WhiteBand ERV-W standard restraint options:
FlexEJ has tie rod restraint options in stock for the WhiteBand ERV-W bellows range. Angular and other configurations can be engineered to your exact requirements, however complex:
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
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
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.
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.
WhiteBand ERV-W comparison chart
Is the WhiteBand ERV-W the best option for your application? Three potential alternatives to consider:
16/50° to 12/70°
16/50° to 10/100°
16/50° to 10/100°
16/50° to 10/100°
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Industry experienceFLEXEJ 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.
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