41 Types
Sight Flow Indicators
Double window, tubular & rotary-wheel patterns — flanged, threaded and weld-end connections, DN15–DN300.
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Noble Glass Works manufactures ISO 9001:2015 certified Sight Flow Indicators, Tank Sight Glasses and Y-Type Strainers — 100+ product types engineered for oil & gas, petrochemical, pharmaceutical and process industries worldwide.
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Product Range
Six product families. One standard of precision.
Every product is built to international standards — from DN15 sight flow indicators to large-bore tank glasses, fluoropolymer-lined fittings and complete pipeline accessories.
41 Types
22 Types
Tank Sight Glass
Circular weld-on, bolt-on and longitudinal types for atmospheric to full-vacuum tanks and vessels, DN50–DN600+.
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5 Types
Y-Type Strainers
Flanged, threaded, weld-end and PFA / FEP-lined Y-type strainers plus a flanged-end basket strainer, NPS ¼–24 in.
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Fluoropolymer Lined Pipes & Fittings
PFA / PTFE lined pipes, elbows, tees and reducers for highly corrosive chemical service.
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Fluoropolymer Lined Valves
PFA-lined ball, butterfly and diaphragm valves engineered for aggressive acids, alkalis and solvents.
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Accessories & Spares
Illuminators, wiper assemblies, replacement glasses, gaskets and spare parts for the full product range.
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Popular Products
Frequently specified patterns
Standard Double Window
Standard flanged double-window indicator for clear monitoring of flow and process condition.
Size: DN15–DN200 / 1/2"–8"
Pressure: Up to 40 bar*
PFA Lined Double Window
Fluoropolymer-lined body provides visual monitoring for corrosive and aggressive process media.
Size: 1"–10"
Pressure: Up to 16 bar*
PFA Lined Tubular
PFA-lined wetted ends with borosilicate tube for 360° viewing of corrosive media.
Size: 1"–12"
Pressure: Up to 16 bar*
Standard Tubular Type
Standard borosilicate tubular indicator for continuous 360° visual process observation.
Size: ½"–12"
Pressure: Up to 16 bar*
Standard Circular Tank Sight Glass
Standard circular weld-on sight glass with serviceable glass, gasket and cover assembly.
Size: DN25-DN300
Pressure: Up to 16 bar*
Obround Longitudinal Tank Sight Glass (PN10)
PN10 obround longitudinal sight glass for extended liquid-level and process observation.
Size: 7 standard sizes
Pressure: ≤10 bar(g)
Flanged-End Y-Type Strainer
Flanged Y-strainer removes solids from process pipelines and protects downstream equipment.
Size: NPS ½-12 in.
Pressure: 19.6 kg/cm² @ 38°C
Why Choose Us
Five reasons specifiers stay with Noble Glass Works
01
Engineering Precision
Every Sight Flow Indicator, Tank Sight Glass and Strainer is manufactured to ASME and DIN flange standards, with borosilicate glass rated for the pressures and temperatures your process demands.
02Dual ISO Certification
Manufactured under an ISO 9001:2015 quality management system and ISO 45001 occupational health & safety system, certified by Bureau Veritas.
0365+ Stock Pattern Types
From the Type 220 general-purpose workhorse to PFA-lined, vacuum-rated and high-pressure variants — most patterns ship from stock, without custom lead times.
043-Year Standard Warranty
Out-of-the-box compliance backed by a 3-year warranty on every Sight Flow Indicator we manufacture — not an optional extended-cover add-on.
05Engineered for Export
Built in Vadodara, Gujarat, and supplied to process plants across oil & gas, petrochemical, pharmaceutical and water treatment sectors worldwide.
Industries We Serve
Engineered solutions for every critical process
Oil & Gas
Petrochemical
Pharmaceutical
Food & Beverage
Water Treatment
Chemical
Power Generation
Certifications & Quality
Manufactured under independently audited quality systems
All products are manufactured under an ISO 9001:2015 quality management system and tested to international standards, with occupational health and safety governed by ISO 45001 — both certified by Bureau Veritas.
- ISO 9001:2015 Quality Management System
- ISO 45001 Occupational Health & Safety Management
- Bureau Veritas Certified
- 3-Year Standard Warranty on Every Unit
Trusted by Industry Leaders
