Technology Solutions

CVT Series Venturi Tube

Accurately measures flow

The classical style Venturi tube was first developed as a differential pressure producing device for flow measurement by Clemens Herschel in 1887. Since that time it has been universally accepted as the most efficient primary element available. No other type of Venturi or flow tube design has been more thoroughly researched, tested and proven than the classical style.

The classical style Venturi tube consists of (1) a straight inlet section of the same diameter as the pipe and in which the high pressure tap is located; (2) a converging conical inlet section in which the cross section of the stream decreases and the velocity increases with a consequent decrease of pressure head; (3) a cylindrical throat which provides for the low pressure tap location of this decreased pressure; and (4) a divergent recovery cone in which velocity decreases and the decreased velocity head is recovered as a pressure head.

The classical Venturi tube is designed to have an uncalibrated inaccuracy of ± 1 - 2% of actual flow. Accuracy of ± 0.25% can be obtained when the Venturi tube is calibrated at a recognized hydraulics laboratory.

To find information about suitable differential pressure transmitters follow the links: EDGE•P FCX-AII V5 FKC Differential Pressure Transmitter or EDGE•P FCX-AII VG FKC Differential Pressure Transmitter with Safety Function

  • For pipes with a diameter from 1” to 96” (DN25 to DN2400)
  • Process connection: flange or weld-in
  • Pressure ratings: unrated, ANSI 150#,300#, 600#, 900#, 1500# or 2500#
  • Accuracy: ±0.25% of flow
  • Materials: carbon steel, SS304, SS316, fiberglass reinforced plastic, high temperature fiberglass reinforced plastic