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Lechler's Principal Facts of Spray Nozzle Technology
Spray Tip Materials:
Most agricultural spray nozzles are made of plastic
(POM), stainless steel, ceramic, and in some cases,
brass. All these materials are resistant to known plant
protection chemicals, and all with the exception of
brass are resistant to liquid fertilizers.
- Plastic is conspicuous for high precision, resistance
to wear and very good price-performance ratios.
- Stainless steel is the material of choice for high
mechanical loads.
- Ceramic nozzles are the most wear-resistant of all
and therefore recommended for their extremely long service
lives and high area specific performance.
Nozzle Wear
- Even properly used nozzles wear down in time and
eventually have to be replaced.
- The rate of wear depends on such factors as spray
pressure, abrasiveness of the sprayed liquid, and the
material of which the nozzle is made.
- Improper cleaning and handling can damage the nozzle
tips and therefore must be avoided.
- If the flow rate through a used nozzle is found
to exceed that of a new spray tip by more than 10%,
it should be replaced.
The wear resistance of the nozzle material increases
in the following order:
- Brass
- Plastic
- Stainless Steel
- Ceramic
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