Linkage Sprayers Product Information (13176 Kb) - Fatcow

hollow cone
air induction
hollow cone
air induction
HORTICULTURAL NOZZLES
Cone Nozzles
The most commonly used nozzle types in horticulture
are cone nozzles. Cone nozzles can be divided into
hollow cone and solid cones nozzles. They have three OPTIMAL
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principal parts:
• the Core or swirl plate. The swirl plate has angled
slots that force the liquid into a centrifugal spin
• the following Swirl Chamber allows the liquid to
settle into spin
• the Disc, or orifice, that meters the final cone pattern
when droplets are emerging.
Cone nozzles can come as a fully
assembled single nozzle body, e.g. ALBUZ
ATR, or in separate parts that need to be
assembled into a nozzle body, commonly
referred to as Cones and Discs. Pressure
used by operators is generally high (5–20 bar).
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Hollow Cone Air-Induction Nozzles
Drift avoidance becomes an ever increasing problem
in horticultural tree and vine applications. Hollow
cone air-induction nozzles, such as the ALBUZ TVI,
utilise the well proven venturi principle to produce
coarser droplets. Drift is reduced but so is coverage.
The final verdict is still to come. Initial results indicate
that air-induction nozzles provide good coverage
when spraying dilute volumes. To make them work in
concentrate spraying it is probably essential to have a
very efficient sprayer (Quantum Mist) and to increase
the spread of droplets with adjuvant technology
(Du-Wett). In New Zealand the kiwi industry uses airinduction
nozzles at certain applications as standard,
but only in combination with well spreading adjuvants.
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Hollow Cone Nozzles
Hollow cone nozzles produce generally a FINE
to VERY FINE spray quality with a narrow droplet
spectrum. The Disc has no hole in the centre and all
the liquid is forced to spin. Their droplets emerge with
a low kinetic energy and may not reach 2m if no airassist
is provided. The small, consistent droplet size and
the low energy levels favour deposition and coverage
and make them to the preferred nozzle type in airassisted
vine and tree spraying. The FINE droplets are
prone to drift.
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See page 66
Solid Cone Nozzles
In contrast to a hollow cone set up, the cores of solid
cones nozzles have an extra hole in the centre that
allows part of the liquid to pass straight to the disc
and fill the inner cone pattern. Those droplets travel
straight with the airstream, have more kinetic energy
and may reach as far as 4m without air-assist. The
uniformity of droplet size is decreased with the centre
hole producing coarser droplets. Distance is improved
but the potential for deposition and coverage on short
distance is reduced. Striping may occur if the canopy
target is to close. Solid cones are generally used to
achieve better coverage on distanced targets such as
the top of a tree.
See page 66
Solid Stream Jet
In solid cone nozzles, the bigger the hole in the middle
of the disc the more centred becomes the output. In a
solid stream jet design the complete core is removed,
leaving the nozzle only with a single orifice in the disc.
All liquid travels in direction of the airstream, has high
kinetic energy and may reach as far as 6m without
air-assist. Spray quality is even coarser and short range
deposition is further compromised. Because it is very
difficult to achieve liquid breakup into droplets with this
set-up it is paramount to use high pressures around 20
bar or above. Solid stream jets are used to cover even
further distanced targets such as tops of tall trees.
Photos are for illustrative purposes only. Prices and specifications are subject to change
without notice. Prices effective January 2013. For indicative freight prices, see page 103. 61
Optima BUYERS’ GUIDE – JANUARY 2013