Venturi flow meter

differential pressurevolumefor liquids

• Venturi Nozzles • Calculation, Design and Manufacture to BS EN ISO 5167:1 • Fabricated from Plate or Machined from Bar/Forgings • Range of Material Grades • Pipe Sizes from 50 mm to 1200 mm • Calibration Service on Request There are two common types of Venturi tube - the Venturi Nozzle, and the Classical (Herschel) Venturi. Both feature a convergent inlet section and a divergent outlet section. The classical Venturi convergent section is a simple truncated cone, whereas for the Venturi nozzle, the inlet contour matches that of the ISA 1932 flow nozzle. The major advantage of the Venturi over orifice plates and flow nozzles is in the area of pressure recovery. Typically, unrecovered pressure is in the region of 10 - 30% of measured DP as opposed to 40 - 90% for an orifice plate (depending on beta ratio). Although the cost of a Venturi can be comparatively high, where pumping costs are important the initial outlay can be warranted.