Continental Trade Sp. z o. o.


Flow sight glasses type 522



The ACI high-pressure sight glass type 522 is designed for the observation and illumination of processes at an operating pressure of up to 160 bar (up to 1000 bar on request). The basic model of the solid stainless steel or steel casing has two female thread connections of a Whitworth, NPT or other standard according to your specifications, integrated directly into the solid casing wall. This avoids welding seams and other elaborate processing, keeping delivery times short.

As casing material, we use the same range of high-quality types of steel and stainless steel as for our other sight glasses, such as the proven Austenite 1.4571, highly acid-resistant 1.4538, the internationally highly recognized 1.4404 and many other materials, including duplex steel and high-performance alloys such as Hastelloy.

Depending on your process data, a glass panel made of borosilicate glass 3.3. according to DIN 7080 serves as a viewing window, or for higher temperatures quartz glass or sapphire are available as a customized option.

For sealing, we use high-quality graphite or mica compound seals in the main pressure shunt, such as novaphit MST or Klinger Milam.

Our Type 522 sight glass is subject 100% to a pressure test with 1.5-fold nominal pressure according to the applicable directives and is supplied to you fully assembled. If parts of the fitting, such as the viewing windows, are subject to wear due to continuous use or are damaged, it is sufficient to notify us of the order number on the casing and we will provide a replacement as soon as possible.

Read on for detailed technical information.


C.22.8, 1.4541, 1.4571, etc.

Straight through flow sight glasses with female thread connection G or NPT.
Optionally available in three-way or four-way shape.

Nominal size:
1/8" - 4" (The design is order-related. Not every nominal pressure is possible at any size)

Nominal pressure:
up to max. 160 bar

With borosilicate glass up to max. 280 ° C
With quartz glass up to 500 ° C
(Higher temperatures on request)


Watch our animation video, here you can see the structure of our flow sight glass type 522 perfectly

Download data sheet.

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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