Flow sight glass type 596 with 4 viewports - PN16 to PN400

Flow sight glasses with four Viewports

The ACI flow sight glass Type 596 is fitted with four viewports to enable the best possible observation of your processes without compromising the pressure compatibility.

Type 596 is fitted with four perpendicular viewing openings. This enables observation of the inside of the pipe from almost all directions. Type 596 can therefore be used in places where a 360° observation of a process is desired, but where our Type 620 would not withstand the operating pressure.

As with our Type 595, the sight glass holders of Type 596 can hold instrument brackets for probes, measuring devices and other equipment instead of sight glass panels. Type 596 can therefore also be used as a modular measuring station.

In the standard model, Type 596 has sight glass panels made of borosilicate glass according to DIN 7080, which easily withstand high temperatures and most acids. If these proven industrial glasses do not satisfy your requirements, we can supply Type 596 on request also with viewing windows made of quartz or sapphire glass.

For sealing, we use high-quality flat seals. You can order type 596 with the proven universal seal KlingerSIL C4400, Frenzelit novaphit MST for higher requirements, or pure PTFE for almost unlimited chemical resilience. Permanently elastic seals such as EPDM, FKM, NBR or silicone are also part of our product range.

To ensure that the casing of Type 596 meets your process conditions, we stock proven pressure container steel such as P365GH or S235JRG2, as well as corrosion-resistant stainless steel 1.4571 or the internationally widely used 1.4404. If required, we can also manufacture the Type 596 sight glass out of Hastelloy and many other special alloys.

Read on for more technical information, 3D views and detailed product graphics!

Technical data


Body made of Stainless steel 1.4571, 1.4539, 1.4404, steel P235GH P265GH and many more.

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

PTFE / FKM / NBR / C4400 / Silicone / EPDM / Graphite , KlingerMilan or on request.


Flow sight glass with 4 viewports

Nominal size:

DN50 to DN100
(other dimensions on request)

Nominal pressure:

PN16 / PN40 / 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


Optional on request:
- In other lengths
- For higher temperatures
- With ANSI flanges
- With butt weld ends
- With illuminator
- With wiper
- With cleaning nozzles

Optional versions are possible.

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Sight glass type 596 with 4 viewports