Machined Venturi

Suitable for small diameters and / or low permanent pressure drop


  • Standards: ISO 5167-1 & 4, ASME MFC-3M.
  • Solder (BW) or flanged connection
  • Material: Standard: carbon steel, stainless steel, others according to your application.
  • Fluid: liquid, gas, steam. Diameter of pipes: from 50 to 250 mm.
  • Accuracy: 1% of max flow.
  • Repeatability of the measurement: 0.1%.
  • Upstream and neck pressure points: annular chamber or individual plugs connected in "triple T".

ISO 5167-1&4 ASME MFC-3M
ReD Reynolds number in pipework 2.105 ≤ ReD ≤ 106 2.105 ≤ ReD ≤ 6.106
D Pipe interior diameter 50 mm ≤ D ≤ 250 mm
β d/D 0,40 ≤ β ≤ 0,75 0,30 ≤ β ≤ 0,75
Ra Roughness at the throat Ra ≤ 10⁴.d
Input cylinder and convergent roughness Ra ≤ 10⁴.d
l Minimum inlet cylinder length l = D
l' Convergent input length l' = 2,7.(D - d)
α Convergent angle of entry α = 21° ± 1°
lc Throat length lc = d ± 0,03.d
φ Diverging angle of exit  7° ≤ φ ≤ 15°

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) or via the contact form. We will respond as soon as possible.

In which cases choose a machined or rolled welded venturi?

A welded rolled venturi is generally suitable for large diameters up to 1200 mm and the machined venturi does not exceed the diameter 250 mm. Their geometric shape is identical and both models have the advantage of creating only a small permanent pressure drop.