PTFE Bellows
Flanges, Inserts & Adaptors
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Full technical data and dimensions
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Bellow Flange
LSBF series, DN 15 to DN 300
Cast iron flange for fitting a bellow to a glass component — supplied with a split ring and two extra holes at 18° for the distance locking bolts.
| Product type | Bellow flange for glass components |
|---|---|
| Material | Cast iron |
| Nominal bore range | DN 15 to DN 300 |
| Used with | FBN, VB and FB type bellows |
| Locking bolts | Two holes at 18° for distance locking bolts |
| Supply | Supplied with a split ring |
| Catalogue reference | LSBF series |
Product overview
What it does, and where it fits.
The bellow flange is used to fit a bellow to a glass component. It is made of cast iron, and it is the flange used with FBN, VB and FB type bellows.
It is provided with two holes at 18° for the distance locking bolts — the bolts that stop the bellow being compressed or stretched beyond its working range — and is supplied with a split ring, so it can be fitted over a beaded glass end without threading the flange along the pipe.
The drilling details table gives the PCD and both hole patterns: n × d for the main bolts, and n × d1 for the two distance locking bolt holes.
Features
Built into every unit.
- Fits a bellow to a glass component
- Cast iron construction
- Used with FBN, VB and FB type bellows
- Two holes at 18° for distance locking bolts
- Supplied with a split ring
- DN 15 to DN 300 in nine catalogue references
Benefits
Why it earns its place in the line.
- Split ring lets the flange be fitted to a beaded glass end in place
- Dedicated locking bolt holes mean the bellow travel is controlled by design, not by judgement
- One flange family covers the line, vacuum and glass-to-metal bellows
Applications & industries
Where it is specified.
Typical applications
- Terminating a line bellow onto a glass pipe end
- Fitting a vacuum bellow into a glass vacuum line
- Assembling bellow joints during glass plant erection
Industries served
- Chemical processing
- Pharmaceutical
- Fine chemicals & dyes
- Distillation & solvent recovery
- Water & effluent treatment
- Agrochemicals
- Research & pilot plant
Technical data
Specification for Bellow Flange.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Bellow flange for glass components |
|---|---|
| Material | Cast iron |
| Nominal bore range | DN 15 to DN 300 |
| Used with | FBN, VB and FB type bellows |
| Locking bolts | Two holes at 18° for distance locking bolts |
| Supply | Supplied with a split ring |
| Catalogue reference | LSBF series |
| Cat. Ref. | DN | D | D1 | D2 | D3 | L | L1 | L2 |
|---|---|---|---|---|---|---|---|---|
| LSBF07 | 15 | 60 | 30 | 34 | 20 | 7 | 3 | 6 |
| LSBF1 | 25 | 110 | 43 | 51 | 33 | 7 | 3 | 9 |
| LSBF1.5 | 40 | 110 | 58 | 66 | 45 | 7 | 3 | 9 |
| LSBF2 | 50 | 120 | 70 | 81 | 57 | 7 | 3 | 9 |
| LSBF3 | 80 | 155 | 101 | 112 | 84 | 7 | 3 | 9 |
| LSBF4 | 100 | 200 | 134 | 148 | 113 | 8 | 3 | 9 |
| LSBF6 | 150 | 275 | 186 | 196 | 164 | 8 | 3 | 9 |
| LSBF9 | 225 | 350 | 260 | 282 | 232 | 8 | 3 | 9 |
| LSBF12 | 300 | 425 | 342 | 363 | 310 | 10 | 5 | 8 |
All dimensions in mm, transcribed exactly from the catalogue page.
| Cat. Ref. | PCD | n × d | n × d1 |
|---|---|---|---|
| LSBF 07 | 50 | 3 × 9 | 2 × 9 |
| LSBF 1 | 70 | 3 × 9 | 2 × 9 |
| LSBF 1.5 | 98 | 3 × 9 | 2 × 9 |
| LSBF 2 | 98 | 3 × 9 | 2 × 9 |
| LSBF 3 | 133 | 6 × 9 | 2 × 9 |
| LSBF 4 | 178 | 6 × 9 | 2 × 9 |
| LSBF 6 | 254 | 6 × 9 | 2 × 9 |
| LSBF 9 | 310 | 8 × 11 | 2 × 11 |
| LSBF 12 | 395 | 12 × 11 | 2 × 11 |
All dimensions in mm, transcribed exactly from the catalogue page. n × d is the main bolt pattern; n × d1 is the pair of distance locking bolt holes set at 18°.
FAQ
Questions we are asked about this item.
It lets the flange be assembled onto a beaded glass end in place. A solid flange would have to be threaded along the pipe from a free end, which on an erected line is usually impossible.
The distance locking bolt holes, set at 18°. Those bolts limit how far the bellow can compress or extend, keeping it inside its working range.
FBN, VB and FB types — that is the line bellow, the vacuum bellow and the glass-to-metal bellow families.
Related products
Commonly specified alongside Bellow Flange.
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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