Fan-spray nozzle
with elliptic hole
The fan nozzles with elliptic hole are more common and are usually assembled on spraying booms. They are considered as being more suitable for pesticide distribution both in pre-planting treatments and in pre-emergency treatments: as the distribution is more even and less sensitive to wind action.
By modification of the pressure and by producing droplets of adequate dimensions these nozzles may be used for fungicide and insecticide treatments.
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The nozzle jets in order not to interfere with each other must be positioned at an angle of 8° in relation to the vertical level between the axis of the boom.
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Fan-spray nozzle
with rectangular hole
These fan-spray nozzles have a limited use and are employed principally in strips thereby making it possible to undertake treatment between one row and the next without affecting the crop.
In fact, thanks to the nozzle design, the jet is homogeneous because the quantity of product delivered at the centre is the same and differs little from that delivered at the exterior.
Depending on the different shape of the hole it is possible to vary the jet angle, normally of between 65°-80° and 110°, that affects the working width of the nozzle itself. Therefore the height of the boom from the ground or crop will change according to the angle, the spacing and the percentage overlap.
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| Correct positioning height of fan-spray nozzles from the target |
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| Classification of drops produced by a single nozzle on the basis of BCPC and ASABE parameters |
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