Preso® differential pressure flow meters type Venturi model VISSL
Classic design for fluids, gas and steam
The Preso® Venturi offers reduced operating costs, proven accuracy, and greater rangeability. Low permanent pressure loss characteristics, due to the Venturi's "low-loss" unique design, reduced energy costs and result in the lowest operating cost.
Preso® Venturi can be installed in any position. The Venturi is suitable for a wide range of conditions in water/wastewater, industrial, institutional, HVAC applications and the food and process industry.
|Application||Fluids, gas, steam|
Diff. pressure flow meters/Venturi tubes
Due to the conical design of the venturi tubes, the flow of a fluid (gas, water, air) at the narrowest point of the low-pressure (p2 = dynamic pressure) results in the accumulation of the medium and at the outlet of the constriction the highest pressure is forming (p1 = static pressure). The pressure difference (incompressible, without friction) for liquids generated by the Bernoulli equation.
Pitot tubes also work on the basics of the Bernoulli equation. In contrast to the venturi tube, work is done with the help of a second tube which is oriented parallel to the flow of the medium, such that the flow impinging on a front pipe opening. In front of the tube is formed the dynamic pressure, behind the tube, the static pressure. This remains constant.
By different shaped pipe openings, measurement results can be affected. By the elliptical shape of the shaft, lowest permanent pressure loss (type Ellipse®) is achieved. In contrast trapezoidal pipe openings create strong vortex shedding in the measuring body and thus impede the flow, resulting in a very high flow resistance. All devices can be used both vertically and horizontally.