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unigreen 19
To prevent the excessive heating of the oil we recommend supplying the
distributor of the sprayer only when the cylinders are being used.
We recommend having qualified personnel do any adjustments.
Pay attention to the integrity and efficiency of the hydraulic components and in
particular to the pipes to prevent the risk of bursting.
Do a full check on the pipes and components at least once a year, we
recommend replacing hydraulic pipes every 3-4 years.
6 SPRAYING
6.1 DESCRIPTION OF TYPE OF JETS
Various types of jets are fitted; with a single or double head.
Generally they have a non-drip diaphragm and are made out of brass, suitable
for pressures up to 40 bar, some models are nickel plated.
The jets can be equipped with different types of nozzles, changing the locking
ringnuts. The jets used normally have high volume, Ø18, ceramic plates and
low volume conical nozzles (Albuz ATR or Teejet TXB). The jets for cannons
have a jet holder with adjustable delivery and spray that has high volume,
ceramic plates, Ø15 instead of 18.
All the jets normally used have three positions (FIG. 26):
a) spray - if the nozzle is pointing outwards, away from the blower group,
parallel with the non-drip valve
b) closed - if the nozzle is at 90° with respect to the non-drip valve or, for the
single jet if it is facing inwards towards the blower group
c) nozzle second spray - when these are pointing towards the outside of the
blower group parallel with the non-drip valve.
6.2 DESCRIPTION OF TYPE OF NOZZLES
The nozzles are extremely important to obtain a correct distribution on the
vegetation to be treated. Poor quality or worn nozzles have a tendency to
create unevenly treated strips.
The nozzles are produced in various sizes, to work with a precise pressure
range, to create certain types of larger or smaller drops; using nozzles for a
purpose they are not envisaged for prejudices the precision and duration of the
nozzles.
6.2.1 NORMAL VOLUME CONICAL NOZZLES (OVER 500L/HA)
Generally made of ceramics, these nozzles consist of various parts; the actual
nozzle, the stainless steel slinger and a series of seals. They are particularly
resistant to wear and are designed to work also at high-pressure (25-45 bar)
producing drops of an average size with strong turbulence. This turbulence
makes them suitable for penetrating luxuriant vegetation and so they are
suitable for fungicides and insecticides. There are various sizes and the
capacities are indicated in table N° 1, page 33.
6.2.2 LOW VOLUME CONICAL NOZZLES (150-500L/HA)
Made of two ceramic pieces with colour-coded plastic inserts, they are
available in various sizes identified by the colour (see tables 2 and 3 page
33).
They have been specifically designed to obtain a large number of small drops
with strong turbulence even at low pressures (2-3 bar). This turbulence makes
them suitable for penetrating luxuriant vegetation and so they are suitable for
fungicides and insecticides. The nozzles of the TR Lechler and TXA Teejet
series are in this category.
6.2.3 ANTI-DRIFT NOZZLES
Specific anti-drift nozzles are available from Unigreen. The main characteristic
of these nozzles is that they eliminate the fog effect caused by the presence
of drops that are too small and are particularly sensitive to drifting. For further
information please contact Unigreen for the relevant instruction handbook.
FIG. 26