PTFE Bellows
PTFE Bellows
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Full technical data and dimensions
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PTFE Bellow — Glass to Metal
LSFBF series, DN 15 to DN 300
PTFE bellow with an adaptor flange at one end for joining glass to rotating or metallic equipment — damps vibration and absorbs the thermal expansion of the metal side.
| Product type | PTFE bellow, glass to metal |
|---|---|
| Material | PTFE bellow with cast iron adaptor bellow flange |
| Nominal bore range | DN 15 to DN 300 |
| Flange drilling | Supplied undrilled; Table E (/E), Table F (/F) or ASA 150 (/A) on request |
| Construction | As the glass-to-glass bellow, with an adaptor bellow flange at one end |
| Catalogue reference | LSFBF series |
Product overview
What it does, and where it fits.
This bellow is used in the installation of glass equipment for two purposes: to minimise the transfer of vibrations from rotating equipment connected to the glass assembly, and to accommodate the thermal expansion of any metallic, non-glass equipment connected to it. A pump or a metal vessel moves differently from a glass line, and this is the component that lets them share a joint.
It is similar to the glass-to-glass bellow in construction, but carries an adaptor bellow flange at one end. Generally this adapter flange is supplied undrilled, so that it can be drilled to match the configuration of the metal flange it must mate with.
However, the adaptor bellow flange can be supplied drilled as per Table E, Table F or ASA 150 standards if specified — the catalogue reference simply takes the corresponding /E, /F or /A suffix.
Features
Built into every unit.
- Minimises transfer of vibration from rotating equipment into the glass assembly
- Accommodates thermal expansion of connected metallic equipment
- Adaptor bellow flange at one end, glass end at the other
- Supplied undrilled by default, to be drilled to the metal flange it meets
- Available drilled to Table E, Table F or ASA 150 on request
- DN 15 to DN 300 in nine catalogue references
Benefits
Why it earns its place in the line.
- Protects a glass line from pump and agitator vibration
- Lets glass and steel expand at their own rates without loading the joint
- Undrilled flange means it can be matched to any bolt configuration on site
- PTFE wetted face — inert to almost all process media
Applications & industries
Where it is specified.
Typical applications
- Connecting a glass line to a pump, blower or other rotating equipment
- Joining a glass assembly to a glass-lined or steel reactor
- Taking up differential thermal expansion between glass and metal plant
- Interfacing glass pipework with non-standard metal flanges
Industries served
- Chemical processing
- Pharmaceutical
- Fine chemicals & dyes
- Distillation & solvent recovery
- Water & effluent treatment
- Agrochemicals
- Research & pilot plant
Technical data
Specification for PTFE Bellow — Glass to Metal.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | PTFE bellow, glass to metal |
|---|---|
| Material | PTFE bellow with cast iron adaptor bellow flange |
| Nominal bore range | DN 15 to DN 300 |
| Flange drilling | Supplied undrilled; Table E (/E), Table F (/F) or ASA 150 (/A) on request |
| Construction | As the glass-to-glass bellow, with an adaptor bellow flange at one end |
| Catalogue reference | LSFBF series |
| Cat. Ref. (undrilled) | Table E | Table F | ASA 150 | DN | D | L |
|---|---|---|---|---|---|---|
| LSFBF 07 | LSFBF07/E | LSFBF07/F | LSFBF07/A | 15 | 95 | 60 |
| LSFBF 1 | LSFBF1/E | LSFBF1/F | LSFBF1/A | 25 | 115 | 60 |
| LSFBF 1.5 | LSFBF1.5/E | LSFBF1.5/F | LSFBF1.5/A | 40 | 150 | 65 |
| LSFBF 2 | LSFBF2/E | LSFBF2/F | LSFBF2/A | 50 | 165 | 65 |
| LSFBF 3 | LSFBF3/E | LSFBF3/F | LSFBF3/A | 80 | 200 | 65 |
| LSFBF 4 | LSFBF4/E | LSFBF4/F | LSFBF4/A | 100 | 220 | 65 |
| LSFBF 6 | LSFBF6/E | LSFBF6/F | LSFBF6/A | 150 | 285 | 65 |
| LSFBF 9 | LSFBF9/E | LSFBF9/F | LSFBF9/A | 225 | 395 | 65 |
| LSFBF 12 | LSFBF12/E | LSFBF12/F | LSFBF12/A | 300 | 445 | 65 |
All dimensions in mm, transcribed exactly from the catalogue page. The first column is the undrilled reference; the next three are the same item drilled to BS 10 Table E, BS 10 Table F and ASA 150 respectively.
FAQ
Questions we are asked about this item.
So it can be drilled to match the metal flange it has to meet. Non-glass equipment rarely carries glass-standard drilling, and an undrilled adaptor flange can be matched to whatever configuration is actually there.
Yes — specify Table E, Table F or ASA 150 and the reference takes the /E, /F or /A suffix accordingly.
Two: vibration from rotating equipment reaching the glass, and the thermal expansion of connected metal equipment loading the glass joint. Both would otherwise be taken by the glass.
Construction is similar. The difference is the adaptor bellow flange at one end, which lets it bolt to a metal component instead of a glass one.
Related products
Commonly specified alongside PTFE Bellow — Glass to Metal.
Enquiry
Tell us your line size — we'll confirm the spec.
Send the bore, the media, the temperature and pressure, and the flange standard you work to. Drawings and custom sizes welcome.
Not sure which spec fits your process?
Send your requirement — media, temperature, pressure, dimensions — and we'll recommend the right product or fabricate it.
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