Venturi tube flow meter - Flow measurement with primary element

The venturi tube is a method of measuring fluid flow using a cylindrical depressurizer with a constriction. As a fluid flows through the tube, its flow rate increases due to the restriction. The pressure difference between upstream and downstream is proportional to the flow rate.

Applicable Standards
  • ANSI/ASME MFC-3M

    Measurement of Fluid Flow in Pipes Using Orifice, Nozzle, and Venturi

  • ISO 5167-1

    Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements

  • ISO 5167-4

    Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 4: Venturi tubes

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