390 Sight Glass For welding PN16, PN25, PN40

Sight Glass
Flange Type
For welding

Sight Glass Flanges with welding neck are suitable for welding on pipes, boilers, tanks and devices of all kinds. They can be installed wherever visual observation of filling processes or flows is desired. Equally suitable for liquids and gases, they are especially recommended for special constructions in several applications.

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Flange: S235JRG2, 1.4571
Glass: Borosilicate glass DIN 7080 (max. 280°C), Soda Lime Glass DIN 8902 (max. 150°C), Quartz Glass (max. 500°C, Special construction)
Seal: C4400, Graphite, PTFE, NBR, Viton

Other materials on request

Installation guideline:
Mounting the Sight Glass will influence the vessel mechanically. This has to be considered during design according to AD 2000 instruction B9!

ACI Type 390
Flange 1.4571
Borosilicate glass          11-390-100-2-1-1-000
Standard construction

Observe the Pressure-Temperature ratings according to DIN EN 1092-1!

For steam or corrosive media we recommend mica disks!

Old type:


Nominal diameter DN25, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN300, DN350
Pressure rating PN16, PN25, PN40
Sight glass body 1.4571, S235JRG2
Process Connection welding ends
Shape Round Sight Glasses
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