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Straight-Through Sight Glass—GB Standard Inline Flanged Sight Flow Indicator
The Straight-Through Sight Glass – GB Standard Inline Flanged Sight Flow Indicator is designed for visual monitoring of liquids, gases, and process media in industrial pipelines. Manufactured according to Chinese GB flange standards, it provides clear process visibility, low flow resistance, and reliable operation in chemical, pharmaceutical, food processing, and water treatment systems.
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Technical data
GB Standard Straight-Through Sight Glass for Industrial Pipeline Observation
The Straight-Through Sight Glass – GB Standard Inline Flanged Sight Flow Indicator is engineered for direct visual inspection of process media flowing through industrial pipelines. Featuring a full-bore straight-through design, it minimizes pressure loss while providing a clear observation area for monitoring flow conditions.
Designed in accordance with GB flange standards, the unit can be seamlessly integrated into Chinese and international industrial piping systems. The transparent viewing section enables operators to observe liquid movement, flow presence, fluid color, bubbles, foam formation, sediment, and contamination without interrupting production.
Manufactured from high-quality stainless steel and equipped with precision-machined sealing surfaces, the sight glass offers excellent corrosion resistance, mechanical strength, and long-term operational reliability.
The viewing window can be supplied in borosilicate glass, tempered safety glass, fused quartz glass, or sapphire glass depending on operating temperature, pressure, and chemical compatibility requirements.
Widely used in chemical processing, petrochemical plants, pharmaceutical manufacturing, food and beverage production, power generation, and water treatment facilities, the GB Standard Straight-Through Sight Glass provides safe and effective process monitoring for critical applications.
GB Standard Straight-Through Sight Glass— Technical Data
| Parameter | Specification |
|---|---|
| Product Type | Straight-Through Sight Glass |
| Standard | GB Standard |
| Connection Type | Flanged / Threaded / Welded |
| Nominal Size | DN15 – DN300 |
| Body Material | Carbon Steel, SS304, SS316L |
| Glass Material | Borosilicate 3.3 |
| Optional Glass | Quartz, Sapphire |
| Gasket Material | PTFE, EPDM, Silicone, Graphite |
| Pressure Rating | PN10, PN16, PN25, PN40, PN64, PN100 |
| Temperature Range | Up to 300°C |
| Surface Finish | Industrial / Sanitary |
| Custom Design | Available |
GB Standard Straight-Through Sight Glass— Technical Advantages
| Feature | Benefit |
|---|---|
| Straight-Through Design | Reduced pressure drop |
| GB Standard Flanges | Easy integration into GB piping systems |
| Stainless Steel Housing | Corrosion resistance |
| Large Viewing Window | Improved process monitoring |
| Multiple Glass Materials | Application flexibility |
| Pressure-Rated Construction | Industrial reliability |
| Leak-Tight Sealing | Operational safety |
| Long Service Life | Reduced ownership costs |
GB Standard Straight-Through Sight Glass— Dimensions
| Pg=10 kg/cm² | ||||||
|---|---|---|---|---|---|---|
| Nominal diameter Dg | External dimensions | Glass plate | Weight | |||
| in | mm | L | H | diameter | thickness | (kg) |
| 1/2″ | 15 | 200 | 130 | 65 | 10 | 4.5 |
| 3/4″ | 20 | 200 | 130 | 65 | 10 | 5 |
| 1″ | 25 | 200 | 130 | 65 | 10 | 5.5 |
| 1 1/4″ | 32 | 260 | 180 | 95 | 15 | 9.2 |
| 1 1/2″ | 40 | 260 | 190 | 95 | 15 | 9.7 |
| 2″ | 50 | 320 | 210 | 140 | 20 | 17 |
| 2 1/2″ | 65 | 320 | 235 | 140 | 20 | 19 |
| 3″ | 80 | 360 | 250 | 165 | 20 | 24 |
| 4″ | 100 | 360 | 270 | 165 | 20 | 26 |
| 5″ | 125 | 440 | 295 | 165 | 20 | 32 |
| 6″ | 150 | 440 | 335 | 165 | 20 | 36 |
| 8″ | 200 | 480 | 380 | 165 | 20 | 48 |
KEY FEATURES
Full Inline Flow Visibility
Straight-through design provides a clear and unobstructed view of process media.
GB Standard Compatibility
Designed according to GB standards for easy installation and replacement.
High-Strength Borosilicate Glass
Excellent thermal shock resistance and chemical durability.
Multiple Material Options
Available in carbon steel, SS304, SS316L, PTFE-lined, and fluorine-lined versions.
Wide Pressure & Temperature Range
Accurate dimensions and polished sealing surfaces
Customizable Connections
Supports GB, ANSI, DIN, JIS flanges, threaded, and welded connections.
Custom Manufacturing Service
We provide tailor-made solutions according to drawings or technical requirements.
- Custom diameter
- Custom thickness
- Special pressure design
- Edge polishing
- Optical finishing
- OEM / ODM support
- Custom packaging
TYPICAL APPLICATIONS
- Pressure Vessels
- Chemical Reactors
- Boilers & Steam Systems
- Pipeline Sight Glass Assemblies
- Pharmaceutical Equipment
- Food & Beverage Processing
- Industrial Observation Ports
FAQ
A: A GB Standard Straight-Through Sight Glass is an inline visual inspection device used to monitor liquid or gas flow directly within industrial pipelines.
A:Yes. We can provide ANSI, DIN, JIS, and custom flange drilling patterns upon request.
A: Borosilicate glass is suitable up to approximately 300°C. For higher temperatures, quartz or sapphire glass is recommended.
A: Yes. PTFE, PFA, and fluoropolymer-lined versions are available for aggressive chemical applications.
A: Yes, optional accessories include LED lights, cleaning wipers, and explosion-proof illumination systems.
Need Custom Straight-Through Sight Glass—GB Standard Inline Flanged Sight Flow Indicator Solutuions?
Send us your drawings or technical requirements for fast quotation and engineering support.