Elaflex Rotex DoubleRed Rubber Bellows
The Elaflex Rotex DoubleRed rubber bellows features an EPDM, hot water resistant, seamless, high abrasion resistance liner with Polymer textile cord, hot water and hydrolysis proof reinforcement and EPDM, ozone proof, heat resistant cover. Suitable for hot heating water, cooling water and hot air. Approved to DIN 4809. The Rotex DoubleRed is available from DN25 to DN1000 with a wide choice of configuration, flange and restraint options:
Elaflex Rubber Bellows
What is an Elaflex Rotex Rubber Bellows?
Designed for high temperature water service...
EPDM for high temperature, swivel flanges as standard in zinc plated carbon steel.
DIN4809 design for high temperature water services, not suitable for drinking water, mineral oils.
PN16 to DN400, PN10 to DN1000 -40°C up to +130°C, temporarily up to +150°C. Electrically dissipative.
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How to select an Elaflex rubber bellows
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Rotex DoubleRed standard restraint options:
FlexEJ has tie rod restraint options in stock for the Rotex DoubleRed 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.
Rotex DoubleRed comparison chart
Is the Rotex DoubleRed the best option for your application? Three potential alternatives to consider:
10/50° to 6/100°
16/50° to 10/100°
16/70° to 8/130°
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.
- 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.