Conical orifice plate

Recommended for low flow rates and / or viscous fluids


  • Standard: ISO / TR 15377.
  • Mounting between flanges: ISO PN 2,5 to PN 420, ASME 150 # to 2500 #, others on consultation.
  • Material: Standard: 304L / 316L stainless steel, others according to your application.
  • Fluid: liquid, gas, steam.
  • Diameter of pipes: from 25 to 500 mm.
  • Accuracy: 2% of max flow.
  • Repeatability of the measurement: 0.1%.
  • Pressure taps: in the corners.

ISO/TR 15377
ReD Reynolds number in pipework 80 ≤ ReD ≤ 6.104
D Pipe interior diameter     25 mm ≤ D < 500 mm
d Orifice diameter d > 6 mm
β d/D 0,1 ≤ β ≤ 0,316
Ra Upstream face roughness Ra < 10⁴.d
e1 Conical entry thickness e1 = 0,084.d ± 0,003.d
e Cylindrical part thickness e = 0,021.d ± 0,003.d
E Plate thickness E ≤ 0,1.D
α Upstream bevel angle α = 45° ± 15°
t Flatness tolerance t < 0,005.(D - d - 2.e1)/2

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.

Why use a conical entry plate rather than a sharp edge plate?

A sharp edge plate is not suitable for a viscous fluid or circulating at too slow speed. A conical inlet plate accepts fluids with a very low Reynolds number (up to 80).

To understand and make your choice between the different orifice plates, refer to the selection table.

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