Product Summary

The Venturi Tube, also known as Venturi, is a Differential Pressure device that performs flow measurement based on the pressure variation that occurs as the fluid passes between the wider section and the throat of the tube. This phenomenon is grounded in the principles of Bernoulli and the continuity equation, which play a crucial role in the accuracy of this measurement.

Main Features:

  • Low Permanent Pressure Loss: Minimizes flow resistance, maintaining system efficiency.
  • Minimal Maintenance: Requires little intervention to keep the instrument in operation.
  • Low Pressure Drop for Measurement: Provides precise measurement with minimal pressure drop.

Operation: The Venturi Tube consists of a closed tube with a precisely calculated conical section. This design allows the increase in fluid velocity in the tube's throat to be converted into a pressure decrease. This pressure drop is proportional to the fluid flow, according to Bernoulli's Theorem. The instrument is equipped with pressure taps that convert this pressure variation into a flow reading through differential pressure transducers.

Main Applications:
  • Water and Sanitation Treatment
  • Oil and Gas Industry
  • Oil Refineries
  • Chemical and Pharmaceutical Industry
  • Food and Beverage Industry
  • Mining and Energy
  • Pulp and Paper Industry
  • Steel Industry

Technical Specification:

  • Uncertainty: +/- 1.0%, with the possibility of reducing to 0.25% through fluid calibration.
  • Repeatability: 0.1% (dependent on the transmitter).
  • Rangeability: 10:1.
  • Standard Beta Ratios: Cast: 0.3 to 0.75; Machined: 0.4 to 0.75; Rolled: 0.4 to 0.7.
  • Pressure Loss: Dependent on β and ΔP.
  • Straight Run Requirement (minimum internal diameter D lengths): Refer to technical specifications for precise information ([email protected]).

Construction Material:• Stainless Steel 316, 304, Carbon Steel, special materials available upon request. Line Diameters:

  • Cast: From 4" to 32"
  • Machined: From 2" to 10"
  • Rolled: From 8" to 48" (larger diameters also available).


  • Flanged
  • Beveled for welding

Pressure Taps:

  • Piezometric Chamber
  • Single Taps

Connections on Taps:

  • ½" NPT, ½" SW, ¾" NPT, ¾" SW, 1 NPT, 1 SW, with pressure classes of 3000#, 6000#, and 9000#.

Approvals (Certifications):

  • ISO 5167

Venturi Tube is a reliable and efficient choice for flow measurement in various industrial applications. Its ability to maintain low pressure losses and provide accurate measurements makes it a valuable instrument for process optimization across a wide range of sectors. Contact us to learn more about how the Venturi Tube can meet your flow measurement needs.

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