Continental Trade Sp. z o. o.


Tubular flow sight glasses type 620


The central component of the ACI Tubular Sight Glass type 620 is a glass tube made of borosilicate glass 3.3, which is clamped between two steel or stainless steel flanges. This design ensures a complete 360° view and illumination of the process medium.

The default version of the tubular sight glass type 620 is equipped with flat gaskets made of virginal PTFE. Other materials like novaphit MST or elastic materials like EPDM and NBR are on stock for your order. If our range of gasket materials does not fulfil your requirements, contact us with your special conditions, and together we will find the perfect solution for you.

The flanges are machined from highly resilient stainless steel 1.4571 (AISI 316Ti, X6CrNiNoTi17-12-2), and held together using threaded rods. The rod assembly also supports the flanges lengthwise to prevent excessive forces from acting upon the glass, ensuring a long lifetime of your device.

For less demanding applications, our tubular sight glass Type 620 can be built using flanges made from P265GH. Of course, it is also possible to deliver special materials like Hastelloyduplex steel or other high performance alloys.

Smaller nominal sizes of type 620 (up to DN50) can withstand an operating pressure of up to 16 bar without restrictions, and up to DN100 an operating pressure of 10 bar is still safe!

Since flange, gasket and glass are well adapted to each other, the tubular sight glass Type 620 contains next to no wake spaces, and is suitable for applications with strict hygiene requirements.

If the installation site is in an area in which manual work is performed, especially if catwalks are situated above the sight glass, we recommend installing a polycarbonate impact protection. This simple optional feature protects the glass tube from falling parts or tools and potentially prevents expensive maintenance or even catastrophic failure of the plant!

Our tubular sight glasses are fully assembled on our factory floor and subjected to a pressure test with 1.5-fold operating pressure. Generally, a regular on-site maintenance is not required.

Read on for more technical information, detailed product viewsvideos and our online 3D view!



1.4571 or P265GH / 1.0425


borosilicate glass 3.3

Viton, PTFE, EPDM or negotiable.

impact protective shell

Tubular sight glasses Type 620 with flanges on both sides to fit flanges according to DIN 2633 and EN 1092 for installation in pipes.

Nominal size:
DN15-DN150 = PN10/16
DN200- DN300 = PN10

Nominal pressure:
up to DN50 max. 16 bar
from DN65 max. 10 bar
from DN125 max. 8 bar
from DN150 max. 7 bar
from DN200 max. 5 bar
from DN300 max. 4 bar

max. 300°C (depending on gasket selection)


Optional versions are possible.

A version for flanges according to ASME 16.5 ,marked as type 620A, is also available.

Watch our animation video, here you can see the structure of our flow sight glass type 620 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.

Information clause

What personal data are processed and who is their administrator?

When using our services, personal data that we process may be, for example, the IP address of your device, data obtained from cookies or similar mechanisms for recording information in Users' devices, as long as they allow you to identify you. More information about the scope of personal data and cookies can be found in the Cookies policy and in Privacy policy.

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.

What is the purpose and basis of the processing of your personal data by Continental Trade ?

Continental Trade processes your personal data to enable you to use our services, match the displayed content and ads to your interests, measure quality and effectiveness, improve content and services.

The basis for the processing of personal data is the legitimate interest of Continental Trade. It includes improving services, ensuring their best quality and informing Users about them.

Confirming that you have read this information,   by clicking on "Go to website" or closing this window at the same time you agree that your personal data will be processed in the same way as described here. You can manage your consent, including withdrawal.

Providing personal information is voluntary.

What are your rights to   Continental Trade in terms of processed data?

You can request from Continental Trade: access to data, rectification, deletion, transfer and, in some cases, processing restrictions, and you have the right to object to the processing of your personal data when personal data are processed on the basis of the legitimate interest of the administrator. You have the right to file a complaint regarding the processing of your personal data to the President of the Office of Personal Data Protection.

To whom does Continental Trade share your personal data?

Continental Trade, in principle, does not share your personal data with third parties, except for situations in which Continental Trade has a legal basis, including at the request of authorized entities, or when it is necessary to perform services offered by Continental Trade, e.g. entrepreneurs providing hosting of our services.

How long does Continental Trade store your personal data?

Continental Trade stores Users' personal data only for the time that is necessary to achieve the purposes for which the data was collected and provided that one of the legal grounds described above is up-to-date or when a new ground has appeared, e.g. a law or the need to enforce claims in court proceedings.

Who can you contact for more information on the processing of personal data by Continental Trade?

If you have questions related to the processing of your personal data on websites operated by Continental Trade or would like to report the issue related to the processing of personal data by Continental Trade, you can contact a Continental Trade representative using the contact information:

More information on the protection of your personal data can be found in the Cookie Policy and Security Policy documents published on our website