Continental Trade Sp. z o. o.


Flow sight glasses type 531


The ACI flow sight glass type 531 uses the same tried and tested basic construction as Type 530 and is therefore significantly lighter than comparable fittings with a cast housing. As with Type 530, only high-quality materials are used in a process that is tightly controlled from issuing the offer to delivery, to ensure that the fitting fulfils your requirements.

The viewing windows facing each other of Type 531 allow the observation and illumination of the flowing medium and in the standard configuration consist of the proven borosilicate glass according to the norm DIN 7080. If this highly resistant glass is not adequate, we can manufacture special glasses made of quartz or sapphire especially for your requirements.

Sealing is provided by quality seals from well-known suppliers, which we select according to the requirements of your individual use. Apart from widespread aramid fiber material seals such as KlingerSIL C4400, we also use seal plates made of graphite with or without metal insert, pure or expanded PTFE, or in extreme operating conditions also mica compound seals.

Contact our teams of experts with your requirements and let us advise you about the possibilities that our product range offers for your system.

See further below for detailed technical information and 3D animations.


Body made of: 1.4571, 1.4541, 1.4404, P235GH, P265GH


Glass plates:
- Borosilicate glass DIN 7080
- Soda lime glass DIN 8902
- quartz glass

graphite (other materials available)

straight flow sight glasses with welding ends

Nominal size: 
DN40- DN400

Nominal pressure:
PN6, PN16, PN40


280 ° C with borosilicate glass to DIN 7080
150 ° C with soda lime glass DIN 8902
up to 500 ° with quartz

Watch our animation video, here you can see the structure of our flow sight glass type 531 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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Administrator, ie the entity deciding on which personal data will be processed and for what purpose, and in what way, is Continental Trade Sp. z o.o. (hereinafter "Continental Trade" or "We") with its registered office and address in Warsaw at Krasnobrodzka Street 5.

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