Continental Trade Sp. z o. o.


Type 321A - ANSI 150/300 lbs


The ACI sight glass fitting type 321A for mounting on flanges according to ASME B16.5 has been construed similar to DIN 28121. It is sealed on the media side by a PTFE-enveloped corrugated ring seal. Since this seal is located in the force shunt, the flange parts of the sight glass lie directly on each other and thus protect the glass plate in the best possible way.

The sight glass type 321A is delivered pre-assembled and ready to use without additional effort. Mounting on a support flange according to ASME B16.5 is possible. Should the unlikely event occur that the glass is damaged during operation, the entire fitting can be replaced with little effort.

The sealing in the force shunt prevents the gaskets from being loosened, which means that it is no longer necessary to tighten the clamping screws on site.

The PTFE-enveloped corrugated ring seal makes the tank sight glass type 321A suitable for foodstuffs, acids, alkalis and most aggressive chemicals. As with all our sightglasses, the glass pane itself can be additionally protected against damaging influences by a mica pane or a FEP protective screen.

You can also order accessories such as wipers type SWI, spraying devices SVI or lights directly from us, adapted exactly to your application.

As a flange material you have the choice between high-quality stainless steel grades such as 1.4541 (321), 1.4571 (316Ti), 1.4404 (316L) or according to customer specifications as well as the lower alloyed steel grades such as P265GH or S235JRG2 for less corrosion-prone locations. As glass, we rely on MAXOS® borosilicate glass, proven in industry, in accordance with the current DIN 7080 standard.



Base flange:
carbon steel / 1.4541 (321) / 1.4571 (316Ti) / 1.4404 (316L) / 1.4306 (304L) / 1.4539 and many more

Cover flange:
carbon steel / 1.4541 (321) / 1.4571 (316Ti) / 1.4404 (316L) / 1.4306 (304L) / 1.4539 and many more

Sight glass:
Borosilicate glass DIN 7080 (up to 200°C)

PTFE enveloped gasket (up to 200°C)


similar to DIN 28121

Nominal size:
DN40 to DN200

Operating pressure:
max. 20 bar -for higher pressures see type 322

Tmax. 200°C
- For higher temperatures see Type 323

Gasket selection:
PTFE enveloped gasket acc. to DIN 28121

Take a look at the animation video, here you can see the structure of our tank sight glass acc. to. DIN 28121 - type 321A 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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