Flow indicator

To visualize the flow circulating in a pipe

A flow indicator or flow monitor allows to visually observe the passage of a fluid. It is therefore equipped with a transparent window or a transparent tube to visualize the flowing fluid.

In the case of transparent fluids, it is also equipped with fins that can be seen rotating in the presence of a flow.

Existing versions :

  • monobloc, machined from a square barstock, very resistant, for demanding applications (no weldings), with or without moving flapper
  • flanged window, with a rotating paddle-wheel
  • transparent tube, without flapper nor rotating paddle-wheel

It can be used for all types of fluids and has a very long lifetime.


  • Welded (BW or SW), screwed or flanged connection.
  • Material: Standard: carbon steel, stainless steel, others according to your application.
  • Glass material : borosilicate DIN 7080
  • Fluid: liquid, gas, steam
  • Custom made according to the pressure, temperature and type of fluid
  • Diameter: ND15 to ND400 - beyond, on request
  • Thickness and diameter of the glass depending on ND and NP
  • Factory glass assembly with leak test
  • Easy installation on site of the device without having to dismantle the glass
  • According to the version, can be mounted horizontally and/or vertically, fluid flowing up or down
You can find below our most frequently asked questions / answers.

If you do not find the answer you are looking for, please contact us either by phone at +33(0)5 59 30 85 20 or via the contact form. We will respond as soon as possible.

Why can a visual flow indicator be equipped with fins?

The fins are used to correctly visualize the passage of a flow, even when the fluid is transparent (water for example). Some devices are equipped with a colored ball that has the same function as the fins.

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