PTFE Bellows

PTFE Line Bellow — Glass to Glass

Name: PTFE Line Bellow — Glass to Glass
Brand: Lata Scientific
SKU: line-bellow
Availability: InStock

LSFBN series, DN 15 to DN 300

PTFE bellow for joining glass to glass — takes up odd degrees and length variation, branches a pipeline safely, and withstands 200 °C under normal atmospheric conditions.

Request a quotation Full technical data and dimensions Request the datasheet

At a glance
Product type	PTFE bellow, glass to glass
Material	PTFE
Nominal bore range	DN 15 to DN 300
Temperature rating	200 °C under normal atmospheric conditions
Face to face	65 mm across the range
Supply	With required bellow flanges and nut-bolts; distance locking bolts included
Gasket	Not required where a bellow is used
Flange drilling	Refer to the bellow flange — Table E, Table F and ASA 150 available

Product overview

What it does, and where it fits.

This bellow is used in the installation of glass equipment for two purposes the catalogue states directly: to provide safe branching of pipelines from the main glass equipment, and to accommodate odd degrees and variation in length. A glass line that has to be built to a real building rarely lands on exact centres, and the bellow is what absorbs the difference without stressing the glass.

The bellow is supplied along with the required bellow flanges and nut-bolts. Distance locking bolts are provided to avoid excessive compression or contraction of the bellow — the bellow is a flexible element, not an adjustable one, and the locking bolts keep it inside its working range. No gasket is required where a bellow is used.

The line bellow withstands a temperature of 200 °C under normal atmospheric conditions. Where the line runs under vacuum at 80 DN and above, the vacuum bellow with its internal support sleeve should be used instead. For drilling details, refer to the bellow flange.

Features

Built into every unit.

Provides safe branching of pipelines from the main glass equipment
Accommodates odd degrees and variation in length
Withstands 200 °C under normal atmospheric conditions
Supplied with the required bellow flanges and nut-bolts
Distance locking bolts prevent excessive compression or contraction
No gasket required — the bellow seals the joint itself
DN 15 to DN 300 in nine catalogue references

Benefits

Why it earns its place in the line.

PTFE wetted face — inert to almost all process media
Relieves the glass line of stress from misalignment and thermal movement
One component replaces a gasket, a spacer and a fabrication tolerance
Constant 65 mm face-to-face across the whole range simplifies layout

Applications & industries

Where it is specified.

Typical applications

Branching a pipeline off main glass equipment
Taking up angular offset where a run does not meet on centre
Absorbing length variation and thermal movement in a glass line
Joining glass sections during pilot plant erection and reconfiguration

Industries served

Chemical processing
Pharmaceutical
Fine chemicals & dyes
Distillation & solvent recovery
Water & effluent treatment
Agrochemicals
Research & pilot plant

Technical data

Specification for PTFE Line Bellow — Glass to Glass.

Figures below are for this product only — every item in the range carries its own dimension table.

PTFE Line Bellow — Glass to Glass — technical specification
Product type	PTFE bellow, glass to glass
Material	PTFE
Nominal bore range	DN 15 to DN 300
Temperature rating	200 °C under normal atmospheric conditions
Face to face	65 mm across the range
Supply	With required bellow flanges and nut-bolts; distance locking bolts included
Gasket	Not required where a bellow is used
Flange drilling	Refer to the bellow flange — Table E, Table F and ASA 150 available
Catalogue reference	LSFBN series

Dimension schematic of a PTFE line bellow between two bellow flanges, showing D, D1, D2 and L — Dimension references — letters match the table.

Line Bellow (glass to glass) — dimensions

Cat. Ref.	DN	D	D1	D2	L
LSFBN 07	15	6	28	21	65
LSFBN 1	25	95	41	31	65
LSFBN 1.5	40	105	56	43	65
LSFBN 2	50	120	69	55	65
LSFBN 3	80	155	98	82	65
LSFBN 4	100	200	132	11	65
LSFBN 6	150	275	184	162	65
LSFBN 9	225	350	258	230	65
LSFBN 12	300	420	340	308	65

All dimensions in mm, transcribed exactly from the catalogue page. Two cells are reproduced as printed and are plainly misprints: LSFBN 07 shows D as “6” where the rest of that column runs 95 to 420, and LSFBN 4 shows D2 as “11” where its neighbours are 82 and 162. Confirm both with us before manufacture.

Request a quote

Available on request

Supplied along with the required bellow and nut-bolts
Distance locking bolts provided, to avoid excessive compression or contraction of the bellow
No gasket is required where a bellow is used

FAQ

Questions we are asked about this item.

No. The catalogue states it plainly — a gasket is not required where a bellow is used. The bellow face seals against the glass end itself.

To avoid excessive compression or contraction of the bellow. They cap the travel so the bellow is not pulled or squashed beyond its working range during installation.

200 °C under normal atmospheric conditions. Under vacuum at 80 DN and above, use the vacuum bellow instead — it carries an internal sleeve that supports the convolutions.

On the bellow flange. The bellow itself is dimensioned by DN, D, D1, D2 and L; the flange page carries the PCD and hole pattern.