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Venturi nozzle type differential pressure flowmeters

Best differential pressure flow measurement method, in terms of pressure loss.

The Venturi Nozzle is an attractive solution for measurements with high accuracy and low residual pressure loss requirements.
This Nozzle has the same features as the ISA 1932 Nozzle except the residual pressure loss is lower.

Working principle venturi nozzle flowmeters

The profile of the Venturi Nozzle is axisymmetric. It consists of a convergent section, with a rounded profile, a cylindrical throat and a divergent section.
A venturi nozzle can be achieved as truncated alternative. The divergent portion may be truncated up to 35% of its length.
At large sizes there is the possibility to go for a sheet metal downstream cone.

Tappings for temperature and pressure sensors

The upstream tap has to be a corner tap and the throat pressure taps should comprise at least four channels leading into an annular chamber.
Depending on the measurement requirements, the tappings are typical 1/2 inch or 3/4 inch. The tappings have a butt or socket weld, screw thread or flange connection. Tappings maybe equipped with condensate chambers and shut-off valves.

Materials and production

Available in wide variety of materials ( SA105, SS316, F12, F22, F91,…)
The flow calculation is performed according to the ISO 5167- Part3.
The typical uncertainty of uncalibrated Long Radius Nozzles is +/- 1,5%.
When the divergent angle is not greater than 15° the relative value of the pressure loss can be accepted as being generally between 5% and 20%.
The Venturi Nozzle is the best solution if short upstream lengths and lower costs are required in comparison to a Venturi Tube.

PVDF coupling

Aluminium coupling

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