Glass Valves
Glass Valves
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Full technical data and dimensions
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Vent Valve
Glass vent valve, DN 15 to DN 40, Type A and Type B
Borosilicate glass vent valve for releasing or admitting air at the high point of a glass system — DN 15 to DN 40 in Type A and Type B builds.
| Product type | Glass vent valve |
|---|---|
| Material | Borosilicate 3.3 |
| Spindle | PTFE |
| Nominal bore range | DN 15 to DN 40 |
| End connection | Beaded glass ends with backing flanges and PTFE-envelope gaskets |
| Flange drilling | See the drilling table — BS 10 Table E, BS 10 Table F and ASA drilling available |
| Pressure rating | Not published on the valve catalogue page — confirm with us for your duty |
| Temperature rating | Not published on the valve catalogue page — confirm with us for your duty |
Product overview
What it does, and where it fits.
A vent valve sits at the high point of a glass system and lets air out as it fills, or in as it drains. Without one, a closed glass line will either hold an air lock that stops flow, or pull a vacuum on drain-down that can stress the glass.
The catalogue lists two builds. Type A covers DN 15, 25 and 40 under the LSPVL references; Type B covers DN 25 and 40 under LSPVLR. Every size shares the same small vent bore — D 11 mm and d 10 mm — because the vent only has to pass air, not process fluid.
Note that this table has no DN1 and no H column: the vent valve is a single-connection item, so it is dimensioned by its line size DN and its overall length L only.
Features
Built into every unit.
- Type A (LSPVL) and Type B (LSPVLR) builds
- DN 15, 25 and 40 line connections
- Common vent bore across all sizes — D 11 mm, d 10 mm
- Length L 125 mm at DN 15, 150 mm at DN 25 and DN 40
- Borosilicate 3.3 body
Benefits
Why it earns its place in the line.
- Prevents air locks that stall flow in a filling line
- Prevents vacuum forming on drain-down, which stresses glass
- Fully transparent — the operator can see the valve position and the media through the body
- Inert to almost all process media; no metal in the wetted path
- PTFE spindle: no lubrication, no seizing, no contamination of the batch
- Bolts straight into the borosilicate pipeline range with the same beaded ends and backing flanges
Applications & industries
Where it is specified.
Typical applications
- High-point venting on glass pipelines
- Air admission on drain-down
- Column and receiver vents
- Breaking vacuum before opening a system
Industries served
- Chemical processing
- Pharmaceutical
- Fine chemicals & dyes
- Water & effluent treatment
- Distillation & solvent recovery
- Research & pilot plant
- Agrochemicals
Technical data
Specification for Vent Valve.
Figures below are for this product only — every item in the range carries its own dimension table.
| Product type | Glass vent valve |
|---|---|
| Material | Borosilicate 3.3 |
| Spindle | PTFE |
| Nominal bore range | DN 15 to DN 40 |
| End connection | Beaded glass ends with backing flanges and PTFE-envelope gaskets |
| Flange drilling | See the drilling table — BS 10 Table E, BS 10 Table F and ASA drilling available |
| Pressure rating | Not published on the valve catalogue page — confirm with us for your duty |
| Temperature rating | Not published on the valve catalogue page — confirm with us for your duty |
| Catalogue reference | LSPVL / LSPVLR series, e.g. LSPVLR1 = DN 25 Type B |
| Vent bore | D 11 mm, d 10 mm — common to every size |
| Length | 125 mm at DN 15; 150 mm at DN 25 and DN 40 |
| Builds | Type A (LSPVL series) and Type B (LSPVLR series) |
| Cat. Ref. | DN | D | d | L | Type |
|---|---|---|---|---|---|
| LSPVL07 | 15 | 11 | 10 | 125 | A |
| LSPVL1 | 25 | 11 | 10 | 150 | A |
| LSPVL1.5 | 40 | 11 | 10 | 150 | A |
| LSPVLR1 | 25 | 11 | 10 | 150 | B |
| LSPVLR1.5 | 40 | 11 | 10 | 150 | B |
All dimensions in mm, transcribed exactly from the catalogue page. This table carries no DN1 and no H column — the vent valve is a single-connection item. The schematic shows the Type A build, which is the one drawn in the catalogue.
FAQ
Questions we are asked about this item.
The catalogue separates them by reference — LSPVL is Type A, LSPVLR is Type B — and gives both the same DN, D, d and L. It does not describe the constructional difference, so tell us your duty and we will confirm which build suits it.
Because the vent only passes air, not process fluid. D 11 mm and d 10 mm are common to DN 15, 25 and 40.
The catalogue lists DN 15, 25 and 40 only. Ask us if you need a larger line vented.
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.
Talk to an engineer