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| A few things to consider.
There is a few good articles on Sprayers101 that gives conceptual layouts and such that might help you figure stuff out. (https://sprayers101.com/recirculating-boom-options/) There are other articles/pages on the site as well.
Just to name the benefits you are looking at:
1. Boom Priming - This is priming the boom with full-concentration chem before you start spraying. So, this is ONLY if you are recirculating the spray volume at a lower pressure than your check valves will open at. If you have ExactApply/PWM with individual nozzle control, you can recirc and prime the boom at any pressure.
2. Flush Valves - Simply enough, this is just getting rid of the last nozzle body position and having a dump valve there so you aren't spraying out any rinsate. Some valve options out there could allow you to sent the flush valve contents back to the tank or a secondary container (e.g. a tote) for leftover chem.
3. Recirc - This is effectively having each boom section linked back in on the backside and going back to tank. Again, same function of boom priming to much of the extent.
Challenges:
1. Without PWM, you are limited to operating <8 PSI with your recirc. Some recirc systems like PP Reclaim use a 'no-pressure building' method to skirt the need for a PWM system or individual nozzle shutoff (without check valves). This would be effectively having each of your sections with a recirc line going back to tank with no dead ends, BUT you'd increase the hose size as your sections are joined to make sure you aren't building pressure in your boom. (As if you do, your nozzle bodies will be spraying at 8-12PSI with a 10PSI check valve).
2. Extra water for flushing/winterizing - This is a small one, but worth being aware of, with the extra hoses/tubing on the sprayer with the recirc routing, there will be more water required for flushing. I know some 120' machines that were sitting with like 27 gallons of product in the sprayer plumbing/tubes/etc jumped up over 60 gallons with recirc. So, make sure you are flushing with more antifreeze come winter time and don't skimp as you have a lot more hose/tubing to consider. When you were talking about having smaller hoses and such, this might work against your setup, as you'd be building pressure more easily, but during recirc you wouldn't want to build pressure.
3. Without PWM or individual on/off valves on each nozzle body, it is a challenge, as you have to maintain sectional control still (so all of your sections are still turning ON or OFF when you need), but still have the ability to have flow-through check valves/back-flow valves that still allow your sections to be turned on without the backflow charging a section that should be off.
So, it is some work cut out for you. Some folks will opt to just add a flush valve on each boom section, and just time the pump running (with the flush valves open) and flush out the semi-concentrated rinsate out before you get going. There is the option to catch the rinsate and toss it back in the tank if you were so inclined.
I'm not sure about the 4920, but a lot of those JD booms had lots of sections and small sections, with center-fed tees (e.g. each section was like 6 nozzles total, split with a tee), so it is kinda gross to think about the effort and cost of adding that much hose and fittings to the sprayers, but it'd be do-able.
Anyways, I'd say check out the few articles on Sprayers 101 first and there might be other posts on the forum here or elsewhere on how to go about it. | |
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JD 4920 Sprayer Boom return
