Corner flow sight glass type 571 with welding ends

Short description - corner flow sight glass type 571

The ACI corner sight glass type 571 is a flow sight glass with 90° offset welding ends and is therefore perfectly suited for installation on pipe bends.

The inspection windows are made of borosilicate glass according to DIN 7080 and withstand most chemicals without any restrictions. For alkaline media and high temperatures, we recommend that the glass surface be additionally protected with a mica pane.

As sealing materials, we rely on high-quality flat gaskets from well-known manufacturers. The KlingerSIL C4400 aramid fibre gaskets used as standard are suitable for most applications. For extended requirements we offer Frenzelit novaphit MST graphite gaskets, gasket sheets made of pure or modified PTFE. We also have soft sealing materials such as silicone, EPDM or NBR in stock for you.

We manufacture the body for you from our range of high-quality steel and stainless steel alloys with pressure equipment approval. From steel grades such as P265GH to corrosion-resistant stainless steel alloys such as 1.4404 and 1.4571, we can meet any requirement. Special alloys such as Hastelloy are also available on request.

As with our other sight glass fittings with round sight windows, the sight glasses can be equipped with cleaning devices such as wipers and spray nozzles. Luminaires based on halogen and LED are also available ex works.

Read on for more technical information!

Technical data


Body made of
Stainless steel 1.4571, 1.4541, 1.4539, 1.4404, steel P235GH and many more.

Glass plates: Borosilicate glass DIN 7080, soda lime glass DIN 8902, quartz glass; META® glass

Gasket: PTFE (200°C) / FKM (200°C) / NBR (100°C) / C4400(150°C) / Silicone (200°C) / EPDM (140°C) / Graphite (280°C) or on request.


Corner Flow Sight Glass

Nominal size:

DN50 to DN400

Nominal pressure:

PN16, PN25, PN40


Operating temperatures:
with borosilicate glass DIN7080 max. 280°C

with borosilicate glass DIN7080 + mica disc max. 300°C

with soda-lime glass DIN8902 max. 150°C

with quartz glass up to max. 500°C

The pressure-temperature limits according to DIN EN 1092-1 apply! For steam or aggressive media we recommend the use of a mica disc!

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Flow elbow sight glass type 571 PN16-40