Venturi Tubes

Perfect Engineering Services proudly presents the Venturi Tube, a versatile differential pressure device engineered for precise flow rate measurement within closed conduits while ensuring minimal permanent pressure loss.


The Venturi Tube finds its applications in critical sectors such as Oil & Gas, Petrochemical Industries, and Power Stations. It boasts a flexible range of types and construction options, including bar stock, welded plate, and even forging for larger sizes and high wall thickness requirements. The Venturi Tube offers customization in divergent angles and connection types, accommodating various process and instrument connections.


Material flexibility is a hallmark of the Venturi Tube, allowing adaptation to customer preferences and stringent material specifications, with references to ASTM-ASME Codes.


In operation, the Venturi Tube creates a differential pressure by strategically constricting the flow path. This pressure drop is proportional to the flow rate, enabling accurate measurement. The Venturi Tube’s robust construction and versatility make it an ideal choice for industries where precise flow measurement and minimal pressure loss are of paramount importance.


  • Venturi by bar stock: 2″ to 10″
  • Venturi by welded plate: up to 48″ (and above, where acceptable by the Customer)
  • Venturi by forging: All dimensions


Beta Ratio:

  • Venturi by bar Stock: 0.4 to 0.75
  • Venturi by welded plate: 0.4 to 0.7
  • Venturi By Forging: 0.3 to 0.75


Reynolds Number Range:

  • Venturi by bar Stock: 200000+1000000
  • Venturi by welded plate: 200000+200000
  • Venturi by forging: 200000+2000000



  • Accuracy (referred to the discharge coefficient): as per ISO Code
  • Rangeability: 1 to 3
  • Repeatability: + 0.1%
  • Max PPL (5-15%) of full scale differential pressure
  • Straight Lengths Requirements: as per ISO 5167 International Code



  • Accuracy (referred to the discharge coefficient) after calibration in an
    accredited laboratory +0.5% of FS



  • Flow Meters can be manufactured according to client specifications
  • Flow Meter can be supplied complete with all suitable accessories (valves / manifold / condensing pot / transmitter / fitting / tubing)