Venturi Tube
Differential pressure type flow sensing device named after Italian physicist Giovani Battista Venturi.
Venturi Tubes are low-pressure-drop metering devices designed with a tapered inlet that creates a drop in pressure with a constricted middle section and restores pressure through a tapered outlet. This element provides low susceptibility to erosion, high-pressure recovery and installation at any angle with virtually maintenance-free operation.
The name of this product is derived from the Venturi effect which states that, the fluid pressure is reduced when the fluid passes through the constricted section of pipe.
Venturi tube can be divided into 4 sections namely
All these sections when connected together, forms Venturi flow meter.
Venturi tubes gives accurate measurement of non-viscous fluids in clean as-well-as dirty fluids, manufactured strictly in accordance with ISO-5167, BS-1042 etc. The unique geometry of Venturi provides a smooth entry as well as smooth exit for the fluid. This causes a less pressure drop across the Venturi i.e. the differential pressure is less. Low DP means low permanent pressure loss. Venturi can be used for a wide variety of gaseous applications. Since divergent cone is provided at outlet of Venturi, the pressure recovery is very good.
Typically the convergent angle is fixed to 21°. Divergent angle can be varied between 7°- 15° without any effect on the pressure loss and discharge coefficient.
