Moulded nozzles and roll-over bodies
So, you've been considering switching from disc-core nozzles to single-piece moulded nozzles. Good for you! You won't regret it. Now the question is will they fit on your sprayer? You will need to take a close look at your nozzle bodies.
For Turbomist® sprayers, there are no roll-over nozzle bodies. Their technique is to mount twice as many nozzle bodies as are necessary to carry two sets of nozzles on the same boom. Arranged in an alternating A-B pattern, you can turn on all the A's or all the B's. Generally, there is no problem fitting moulded tips with the possible exception of the caps, which we'll get to later on.
If your sprayer has roll-over bodies already, you'll want to check the diameter of the body outlet (where the nozzles rests) and the outlet cap. For example, if you have an older FMC®or a European import like a GB®, your existing body may not work and you'll have to consider replacing them. Check to see if your sprayer uses proprietary white ceramic FMC®discs-cores (see Figure 1), or if it has large diameter pink ceramic disc-cores (see Figure 2 and Figure 3). Moulded nozzles won't fit in those bodies, so you'll need to replace them.
Figure 1 - FMC nozzle bodies removed from sprayer
Figure 2 - European nozzle bodies removed from sprayer
Figure 3 - Note the larger diameters of the gasket and ceramic disc compared to the shoulder of the moulded nozzle
TeeJet® sells brass roll-over nozzle bodies, but the options and potential compatibility issues might surprise you:
- There are four inlet thread types NPT, BSPT, NPS and BSPP (see Figures 4 through 7). The inlet thread sizes are 1/4" female, 1/4" male and 3/8" male. 1/4" female is not available on the NPS or BSPP inlet thread types.
- The roll-over feature allows you to turn off the nozzle, but it also allows you to reposition the tip +/- 15° from centre. Be aware that moulded nozzles protrude and may hit the edge of the sprayer duct when they are turned. Check to see that they'll clear everything.
- Make sure the bodies you get have diaphragm check valves. They are an option well worth having (see Figures 4 through 7 again).
- Nozzle bodies have either single or double outlets. The doubles are very convenient because they allow you to switch between two nozzles very quickly.
Figure 4 - NPT single outlet roll-over nozzle body with shallow cap
Figure 5 - NPS single outlet roll-over nozzle body with deep cap
Figure 6 - BSPT single outlet roll-over nozzle body
Figure 7 - BSPP single outlet roll-over nozzle body
Nozzle bodies DO NOT come with the caps - you have to order them separately. I found this out the hard way. The standard caps are brass hex nut-style but you can also get nylon wing-style caps so you don't need a wrench to get them off. Caps should only ever be finger-tight, anyway. What isn't obvious is that there are two depths of cap (see Figures 4 and 5 again).
The reason is because growers may be using an optional gasket between the cap and the tip, and hopefully are using strainers between the tip and the body. Those take up room, so a deeper cap may be required. Another reason is because of the nozzle shoulder. You'll note in the TeeJet catalogue that they sell an A and a B option for each moulded hollow cone tip (see Figure 8). The B style has a thick shoulder, similar to European Albuz®-brand moulded nozzles. If you have tips with thick shoulders, shallow caps may not thread onto the body outlet. Alternately, if you have a deep cap and a nozzle with an A style (thin) shoulder, the cap will be completely tightened but will not compress the shoulder against the body outlet to form a seal - the spray will escape around the loose nozzle.
Figure 8 - Moulded hollow cone nozzles with the A-style (thin) and B-style (thick) shoulders
Don't let all this erode your resolve to switch to moulded tips. Examine your sprayer and determine which tips, which nozzle bodies and which caps will get the job done.
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|Author:||Dr. Jason S.T. Deveau - Application Technology Specialist/OMAF and MRA|
|Creation Date:||15 February 2014|
|Last Reviewed:||15 February 2014|