The robust and reliable flap-type or sight flow indicator for clear liquids

With Intra, we offer a flap indicator as a mechanical flow meter for liquids in closed pipelines. Intra is an extremely robust flap-type flow indicator and suitable for media temperatures up to +100 °C at an operating pressure of up to 10 bar.


The Intra flap or sight indicator guarantees control / display of flows in closed pipelines.

The Intra flap indicator is used in the following industries:

  • Building services, air conditioning and heating technology
  • Chemicals
  • Plant and mechanical engineering
  • Water and wastewater

Advantages of the flap indicator:

  • Very robust design
  • Suitable for clear and cloudy liquids
  • Vertical and horizontal installation possible
  • Practical, low-maintenance design
  • Largely independent of viscosity
  • Suitable for liquid temperatures up to max. +100 °C

Measuring tube connections:

  • Flange EN 1092-1: DN 15 – DN 150
  • ANSI B16.5: 1" - 6"
Measuring ranges 0,5 – 160 m³/h
Accuracy class ± 5 % of URV
Pressure limits max. 10 bar
Temperature limits 0 °C to +100 °C
Flow directions vertically upwards
horizontally from left to right
horizontally from right to left
Process connections Flange EN 1092-1: DN 15 – DN 150
ANSI B16.5: 1“ – 6“


  • Maintenance / repair

Product advice

If you have any questions or require a custom solution please call us or write us.
We look forward to hearing from you.

Your contact partner

Michael Jüch
Sales Director
Tel.: +49 (0)2237 60006-14

Go back