There are many nozzles on the market and definitely not limited to the information below nor the manufacturers. However as a general guide and for what most people need the information is a great starting point and probably will give you the desired result. If you are looking for something a little bit more niche we do have other products which will help ensure you get the correct application - just give us a call.
For conventional hydraulic nozzles, spray quality varies according to nozzle size (defined by nozzle flow in l/min) and with pressure, larger sizes and lower pressures produce larger droplets.
Spray quality is defined by Volume Median Diameter (VMD) which is the mid droplet size where half of the volume of spray is in larger and half in smaller droplets. The BCPC International Spray Classification System, groups nozzles into five
categories: VERY FINE, FINE, MEDIUM, COARSE AND VERY COARSE, each category covering a range of VMDs.
It is important to note that drift potential varies according to spraying pressure, boom height and wind speed.
Hypro Nozzle Chart
Teejet Nozzle Chart
Have a look below or go straight to the HYPRO spraying guide : http://www.hypro-eu.com/fileattachments/Hypro-eu/en-gb/2016-English-Pocket-Guide-web.pdf
If you have a mobile - this Teejet app comes in pretty hand - http://www.teejet.com/tools/spray-nozzle_selection.shtml
Nozzle Code Understanding: At the end of a lot of nozzles you will see two letters - these mean:
VP - Variable Plastic
VS - Variable Stainless
VK - Variable Ceramic
VB - Variable Brass
SS - Stainless Steel
Choosing and maintaining the correct nozzles has an enormous impact on the accuracy and efficiency of agrochemical application. To select the correct nozzle for the job, follow the steps below:
(a) Follow the advice given on the product label (check whether there are any local environmental restrictions or requirements, such as LERAP in the UK).
(b) Check which type of spraying technique you will be using.
(c) Select your application rate – Lower rates will increase work rates in arable crops.
(d) Check your forward speed – high speeds over 12Km/h will increase your work rate and slower speeds of 8-
(e) Check your pressure – Finer droplets are produced at higher pressures -
(f) Select the spray quality that you require. See below.
(g) Select the nozzle style for the required spray pattern.
(h) Make sure that you have fulfilled all criteria before you reduce buffer zone widths with LERAP rated equipment.
(i) Check that all constraints have been accounted for e.g. output of your sprayer pump.
The most important performance characteristic of an agricultural spray nozzle is the size and the variation of droplets or spray quality that it produces. Conventional nozzles are classified by the droplet size that they produce at a given pressure according to the BCPC International Spray Classification System (e.g. coarse, medium, fine). Different air-
Flat fan pattern:-
Sprayers provide filtration at all stages of the spraying system starting with a coarse basket, foot or suction filter at tank filling, medium filtration in front of the pump and finer pressure line filters between the pump and the pressure regulator or between boom sections. It is also possible to fit fine filters behind the nozzle, perhaps where no pressure line filters are fitted or for very low volume applications.
However, in practice it may be easier to replace a blocked nozzle rather than replace the filter and it is always advisable to carry replacement nozzles. Mesh size is important for nozzle filters and recommendations vary with nozzle size; 100 mesh (green) for nozzle sizes 01 and 03, 50 mesh (blue) for 04 to 08 and 30 mesh (red) for 10 to 20. Filter mesh recommendations are available on all Hypro nozzle charts. Nozzle filters may be cylindrical which provide the largest screening area, cup filters are an alternative where nozzle holder design dictates and ball check filters provide some anti drip control where there is no DCV or airstop on the holder.
Care of nozzles
The rate at which nozzles wear depends on the abrasiveness of the liquid, the pressure used and the material that the nozzle is made of. A worn nozzle means that spray quality and spray pattern will both be compromised. Even with the most sophisticated flow rate governed sprayer this means that the operator loses control of these two most important spraying parameters.
Polyacetal:- Provides good resistance to most chemicals and superior resistance to wear with most agricultural chemistry. Susceptible to strong mineral acids and a few organic solvents. Resistance to most alkalis is excellent. Organic solvents usually cause slight swelling without any other harmful effect.
Stainless steel : -
CARE OF NOZZLES
Spraying nozzles are precision-
Care of filters
Check filters regularly, cleaning out any debris under running water. Replace filters which are damaged to prevent blocked nozzles.
If you want more information - give us a call or fill in the box below. Sometimes depending on the conditions and what you want to do there may be a better solution then what is mentioned here ans as specialists we have the knowledge to point you in the right direction.