Lined Sight Glass
Visual Flow Verification with Tubular & Double-Window Configurations
0.5" – 6"
Size Range
Flanged, RF
Connection
Manufacturer's Standard
Design Std
PFA / FEP / PVDF
Lining
Engineered Lined Sight Glass for Corrosive Service
UNP’s Lined Sight Glass is engineered for the most demanding corrosive service applications. Visual Flow Verification with Tubular & Double-Window Configurations
The dove-tail-anchored fluoropolymer lining (PFA, FEP, PVDF, ETFE, or PPH) makes every valve suitable for pressure and vacuum service. Investment-cast body components ensure uniform lining thickness even at intricate contours.
Every valve is 100% hydro and pneumatic tested with optional helium leak testing on request, certified to ISO 9001:2015 and CE under PED 1128.
Why Choose This Valve
- ✓Tubular & Full-View configurations
- ✓Double-Window option for redundant visibility
- ✓Borosilicate glass standard
- ✓PFA / FEP / PVDF lined body
- ✓Pressure & vacuum rated
Technical Specifications
Engineered to meet international standards for corrosive valve service.
Manufacturer's Standard
Design
ANSI B 16.34
Shell Design
ANSI B 16.10 (Up to 4") / Mfr's Std
Face to Face
ANSI B 16.5, 150# / DIN PN 10
Flange Rating
BS EN 12266-1
Testing Standard
Flanged, RF
Connection
Engineered for Performance
Every detail purpose-engineered for corrosive service longevity.
Virgin Materials
100% virgin PFA / FEP / PVDF from Dyneon, Chemours, Solvay.
Dove-Tail Lining
Anchored lining suitable for both pressure and vacuum service.
Investment Cast
Even lining at intricate contours via investment-cast bodies.
Injection Molded
Lining applied by injection (not transfer) — compact & reliable.
100% Tested
Hydro & pneumatic tested — optional helium leak testing.
ISO & CE Certified
ISO 9001:2015 + CE certification under PED 1128.
Multi-Standard
ANSI, DIN, and JIS flange dimensions available.
Antistatic Option
Antistatic PFA grade (C 980 / 8502 ESDZ) for explosive atmospheres.
Detailed Engineering Reference
Tests, weight chart, valve code reference, and pressure-temperature graph.
Tests Performed
| Test | 0.5" – 3" | 4" – 6" |
|---|---|---|
| High Pr. Shell Test (Hydro) | 225 PSI | 150 PSI |
| Low Pr. Test (Pneumatic) | 45 PSI | 45 PSI |
| Spark Test | 20 KVDC | 20 KVDC |
Valve Net Weight Chart
| Size | Tubular (kg) | Double Window (kg) |
|---|---|---|
| 0.5" | 2.50 | 3.20 |
| 0.75" | 3.20 | 4.10 |
| 1" | 4.10 | 5.30 |
| 1.5" | 6.80 | 8.50 |
| 2" | 10.20 | 12.80 |
| 2.5" | 14.50 | 18.00 |
| 3" | 19.20 | 24.50 |
| 4" | 30.50 | 38.00 |
| 6" | 55.00 | 68.00 |
Valve Code Reference
Complete reference of code values used in this valve's part-numbering system.
Valve Type
| Option | Code |
|---|---|
| Sight Glass - Full View | SGFV |
| Sight Glass - Double Window | SGDW |
Body Casting
| Option | Code |
|---|---|
| ASTM A 216 GR. WCB | C1 |
| ASTM A 351 GR. CF 8 | C2 |
| ASTM A 351 GR. CF8M | C3 |
| ASTM A 890 GR. 4A (CD3MN) | C5 |
Lining Material
| Option | Code |
|---|---|
| PFA | L1 |
| FEP | L2 |
| PVDF | L3 |
| ETFE | L4 |
| PPH | L6 |
| Antistatic PFA | L7 |
Glass
| Option | Code |
|---|---|
| Borosilicate | GB |
| Quartz | GQ |
Fasteners
| Option | Code |
|---|---|
| SS 304 | F2 |
| SS 316 | F3 |
| High Tensile | F4 |
| ASTM A 193 GR. B7 | F5 |
Pressure - Temperature Graph
Operating envelope across full size range and lining options.
Product Documentation
Brochures, datasheets, and installation manuals — ready for download.
Product Brochure
Full catalogue with options and variants (PDF, EN)
Technical Datasheet
Weight chart, tests, P-T graph (PDF, EN)
Installation Manual
Step-by-step installation guide (PDF, EN)
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