Agriculture Reference
In-Depth Information
The nozzle body holds the strainer and tip in proper position. Several
types of tips that produce a variety of spray patterns may be interchanged on a
single nozzle body made by the same manufacturer.
The cap is used to secure the strainer and the tip to the body. The cap
should not be overtightened.
The nozzle strainer is placed in the nozzle body to screen out debris which
may clog the nozzle opening. The type of nozzle strainer needed depends on
the size of the nozzle opening and the type of chemical being sprayed.
Special nozzle screens fitted with a check valve help prevent nozzle drip-
ping. Check valves should be used in situations where a sprayer must be
stopped and started frequently, such as in small target areas, near sensitive
crops or areas, indoors, or for right-of-way treatments. The operator must
check these spring-loaded ball valves frequently to assure proper operation.
Nozzle tips break the liquid pesticide into droplets. They also distribute
the spray in a predetermined pattern and are the principal element that controls
the rate of application. Nozzle performance depends on:
nozzle design or type
operating pressure
size of the opening
discharge angle
distance of nozzle from the target.
a.
Nozzle Patterns
Nozzle patterns are of three basic types: solid stream, fan, and cone.
Some special-purpose nozzle tips or devices produce special patterns. These
include "raindrops," "flooding," and others that produce wide angle fan or
cone-shaped patterns.
Solid stream nozzles—These nozzles are used in handgun sprayers to
spray a distant or specific target such as livestock, nursery, or tree pests, and
for crack and crevice treatment in and around buildings. They also may be
attached to booms to apply pesticides in a narrow band or inject them into the
soil.
Fan pattern nozzles—At least three types of nozzle tips have fan patterns.
They are used mostly for uniform spray coverage of surfaces, for example,
applying herbicides or fertilizers to soil.
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