PTFE expansion bellows, otherwise known as PTE expansion joints, offer excellent media compatibility and corrosion resistance. Offered in two ranges - standard 'R' and heavy duty 'RHD' - with diameters from 25mm to 600mm. All bellows have Van Stone flanges - any drilling available - and limit rods:
What is a Convoluted PTFE Expansion Bellows?
For excellent corrosion resistance and media compatibility...
Solid, multi laminated PTFE bellows with coated carbon steel flanges.
Highly corrosive and contamination sensitive media.
Varies with number of convolutions and strongly with temperature. Electrically conductive.
Minimum porosity and homogeneous wall thickness.
How to select a PTFE bellow
Temperature is the most critical selection factor as the mechanical strength of PTFE decreases rapidly with increasing pressure. Note that due to the limited strength of PTFE the number of convolutions also strongly influences the rating of the bellows, we provide data for 2-3, 4-6 and 7-10 convolution bellows. The Heavy Duty bellows have a higher pressure rating but a lower range of allowable movements.
PTFE is almost totally chemically inert and highly insoluble in most solvents or chemicals. This makes it an excellent choice in highly corrosive environments or where media contamination is an issue. However where the temperature and mechanical strength of a PTFE bellows is a problem other materials – or a PTFE liner in another type of bellows - may be a better solution, see our Bellows Finder.
Standard diameters between DN25 and DN600 in 2-10 convolutions, fixed lengths. For larger diameters and other lengths the Safetech rubber bellows range can be specified with a PTFE liner
Any flange drilling can be supplied; if you are uncertain about what you already have installed our Flange Finder will help you identify it. PTFE bellows have Van Stone flanges (see FAQ) with limit rods to prevent over extension. The bellows will exert a pressure force on the pipe (see FAQ) which must be restrained or absorbed at the piping anchors.
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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 email@example.com
FlexEJ's PTFE Expansion Bellows
FlexEJ has the following two ranges of PTFE joints available:
STANDARD DUTY, 2-3, 4-6 and 7-10 CONVOLUTIONS
Inert, highly compatible
Solid PTFE multilayer convolutions assure minimum permeability and good mechanical performance. Rated from 10 Barg at 50°C, the pressure rating reduces with both increasing temperature and number of convolutions, please see the range charts. Supplied with flanges which can be specified to any drilling pattern in coated carbon steel or stainless steel. Flanges are Van Stone which guarantees that the media is only ever in contact with PTFE. Limit rods are provided to prevent over extension.
HEAVY DUTY, 2-3, 4-6 and 7-10 CONVOLUTIONS
Inert, highly compatible
Solid PTFE multilayer convolutions assure minimum permeability and good mechanical performance. Rated from 16 Barg at 50°C, the pressure rating reduces with both increasing temperature and number of convolutions, please see the range charts. Supplied with flanges which can be specified to any drilling pattern in coated carbon steel or stainless steel. Flanges are Van Stone which guarantees that the media is only ever in contact with PTFE. Limit rods are provided to prevent over extension.
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 8:30am to 3:30pm weekdays, 12:30pm Fridays 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 firstname.lastname@example.org.
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Alternatively, you can also call our expert team directly on +44 (0) 1384 881 118 from 8:30AM to 4:30PM weekdays (12:30PM Fridays), 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.
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.