DIN 28120 Sight Glass

DIN 28120 Circular Flanged Sight Glass Fittings

These high-precision circular flanged sight glass assemblies, manufactured to DIN 28120 specifications, are designed for welding either into or onto vessel walls. Each unit is supplied complete with matching seals and a robust sight glass disc, securely positioned between the flange rings for a reliable, leak-tight installation.

The standardised flange thickness ensures accurate, distortion-free positioning of the sight glass—provided the welding process is carried out correctly—resulting in consistent sealing performance and long service life.

These fittings can be paired with compatible sight glass luminaries, making them suitable for both safe and hazardous area installations.

Specifications:

• Nominal sizes: DN 50 to DN 200 (viewing diameters: 80 mm to 225 mm)

• Pressure rating: Up to 16 bar (size-dependent; higher ratings available on request)

• Temperature rating: Up to 280 °C depending on material; up to 900 °C with special configurations

• Materials: Stainless steel, carbon steel, and speciality alloys such as Hastelloy

• Custom builds: Available to suit specific application requirements