High pressure corner flow sight glass type 575

Short description - High pressure corner flow sight glass type 575

The ACI high pressure corner sight glass type 575 is a flow sight glass with 90° offset connecting flanges and is therefore perfectly suited for installation on pipe bends.

The inspection windows are made of borosilicate glass in accordance with DIN 7080 and withstand most chemicals without restrictions. For alkaline media and high temperatures, we recommend that the glass surface be additionally protected with a mica pane or a FEP protective 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 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 (316) and 1.4571 (361Ti), we can meet any requirement. Special alloys such as Hastelloy are also available on request.

We manufacture the connecting flanges to fit flanges according to DIN EN 1092-1, but we can also manufacture other standards such as ASME B16.5 and even special flanges according to your individual specifications.

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. Halogen and LED lights are also available directly from the factory.

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:

PN63 / PN100 / PN160 / PN250 / PN320 / PN400


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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High pressure flow sight glass type 575