• Preso® differential pressure flow meters type Ventur V-Serie

Preso® differential pressure flow meters type Ventur V-Serie

Low loss design (short form) for fluids, gas and steam


Chemical/Petrochemical media, Oil, Pharmaceutical media, Gas, Water, Others
max. flow:
from 1 up to 500 l/min
from 0 up to 120 °C
max. pressure:
from 0 up to 27 bar
Chemical industry, Oil industry, Gas industry, General industry, Water & waste water industry


General information

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.    


Technical data

Application Industrial applications
Material Stainless steel, polycarbonate, brass

Measuring principle

Diff. pressure flow meters/Venturi tubes

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.