Intermediate flange sight glass Type 641 | ACI Industriearmaturen GmbH

Intermediate flange sight glass Type 641 - PN40

Brief description: Intermediate flanged pipe sight glass for higher pressures

The ACI intermediate flange tubular sight glass type 641 is a solid intermediate flange version of our tubular sight glasses.

The Type 641 is suitable for an operating pressure of up to 40 bar and can be easily installed between flanges according to DIN EN 1092-1. Thanks to its compact design, Type 641 can also be installed in an existing system with very little effort. In addition, we can realize operating pressures of 16 bar and more even with larger nominal diameters.

The standard version made of borosilicate glass is suitable for an operating temperature of up to 280°C

Read on for more technical information and detailed views!

Technical data


  • Acrylic glass
  • Borosilicate glass (thermally hardened)


Borosilicate glass 280°C

Nominal size:

DN 10-500 (other dimensions on request


Intermediate flange version

Nominal pressure:

PN 25/40 (Borosilicate glass)


Optional versions are possible.

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Intermediate flange sight glass Type 641