flange sight glass type 640A | ACI Industriearmaturen GmbH

Intermediate flange sight glass type 640A - CLASS 150

Description: Intermediate flanged sight glass for higher pressures

The ACI intermediate flange tubular sight glass type 640A is a solid intermediate flange version of our tubular sight glasses.

The Type 640A is suitable for an operating pressure of up to 20 bar and can be easily installed between flanges according to ASME 16.5B CLASS 150. Thanks to its compact design, Type 640A can also be installed in an existing system with very little effort. In addition, we can realize operating pressures of 20 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 (PMMA) 
  • Borosilicate glass (thermally hardened)


Intermediate flange version


  • Acrylic glass 80°C
  • Borosilicate glass 280°C

Nominal pressure:

CLASS 150 - up to 20 bar - depending on the size

Nominal size:

1/2" - 20" - other dimensions on request


Optional versions are possible.

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flange sight glass type 640A