Products 
Venturi nozzles
The Venturi nozzle is designed as a combination of the ISA 1932 nozzle and the Venturi tube. Tapered part of the Venturi nozzle is the same as round inlet of the ISA 1932 and it enters into cylindrical orifice with conical Venturi similar to the one in the Venturi tube. Venturi makes the difference only in permanent loss in pressure deduced from the Venturi nozzle, vertex angle is 30°C or lower. These have also smaller measures of measured flows than orifice plates.
Main advantages of the Venturi nozzle:
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It is a source of a very small loss in pressure. The Venturi nozzles have the lowest losses in pressure of all primary elements.
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For high velocity flowing fluids the Venturi nozzles are elements, on which wear of measuring areas is minimal.
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There are elements enabling measurement on suction from open space, i.e. without necessity of using tapering lengths in front of the meter.
Diagram of Venturi nozzle
flow direction
Long radius nozzles
These nozzles have lower losses in pressure than orifice plates. In comparison with orifice plates these also have lower range of measured flow. The nozzles have different shapes and positions of pressure tappings.
Use: Measurement within foreign standards
Eliptic nozzles
These are very specialised products with high requirements on accuracy of measurement both concerning calculations and the product itself. Tappings of pressure differential are placed in the throat of nozzle.
