Sight Glass / Flow Indicator
Flanged sight glasses for reliable visual confirmation of flow, colour, clarity, and direction in process, water, and chemical pipelines.
A sight glass (flow indicator) lets operators visually verify flow, direction, colour, and clarity of a fluid without breaking into the line. Supreme Valves supplies full-view (tubular), double-window, and flapper/rotary-type sight glasses in cast iron, carbon steel, and SS316 with borosilicate or toughened glass rated for the line pressure and temperature.
Sight Glass Types
Specifications
- Body: Cast Iron, Carbon Steel (WCB), SS304 / SS316, PP/PVDF-lined for corrosives
- Glass: Borosilicate / toughened soda-lime, with optional protective shields
- End connections: Flanged (ASME B16.5 / IS 1538), screwed BSP/NPT
- Size range: 15mm to 300mm (1/2" to 12")
- Options: PTFE gaskets, wiper, illuminator, and high-temperature glass
Frequently Asked Questions
What is a sight glass used for?
A sight glass (flow indicator) provides a sealed window into a pipeline so operators can visually confirm whether fluid is flowing, its direction, colour, and clarity — useful for verifying pump operation, dosing, and process changes.
Which sight glass type should I choose?
Double-window types suit general process verification; full-view/tubular types give a 360° view of colour and clarity; flapper and rotary types clearly show flow and direction in liquid lines.
What materials are available?
Bodies are available in cast iron, carbon steel, SS304/SS316, and lined (PP/PVDF) construction with borosilicate or toughened glass selected for the pressure and temperature.
Need Sight Glasses or Flow Indicators?
Request a technical datasheet, material certification details, or a project quotation from our engineering team. We export to Saudi Arabia, the UAE, and across the Gulf.