Venturi tube

Engineered primary element for DP flow measurement of liquids, gases and steam with the lowest residual pressure loss

  • Machined or welded design (internally machined) according to EN ISO 5167, ASME MFC3
  • Lowest residual pressure loss of all DP elements
  • Only short inlet/outlet runs required
  • From basic to special wet gas applications and high pressure conditions

Venturi tube


A Venturi tube is an engineered primary flow element for the most efficient and accurate differential pressure (DP) flow measurement. The typical Venturi shape with limited cone angles enable a pressure recovery of up to 95% of the generated DP. Together with optional annular chambers to balance deviation in the flow profile. With low maintenance requirements and a long life the Venturi tube offers a low total cost of ownership. A special Venturi tube that enables online measurement of additional process parameters such as steam wetness can also be provided.

Product highlights

  • Typical uncalibrated uncertainty up to ±1.5%
  • Optional accredited wet calibration at operating Reynolds numbers for uncertainties up to ±0.2%
  • Typical pressure loss down to 5% of the generated differential pressure
  • Low requirements for straight inlet and outlet runs
  • Best option for large sizes and low pressure applications
  • With weld ends or flange connections
  • With optional annular chambers and multiple pressure taps
  • Size: 2…48" (50…1200 mm) per standard, larger sizes upon request
  • Low maintenance and long life with low total cost of ownership (TCO)

Typical applications

Power generation and other industries

  • Steam and gas applications with high flow rates
  • DP flow application with high accuracy requirements
  • Performance testing
  • Large line size applications
  • Geothermal steam measurement

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