The 700 series trailed sprayers can be fitted with the ring line circulation system. This continuous circulation system ensures continuous agitation of the spraying liquid up to the section valves, also when not spraying. Therefore the risk of chemical sedimentation is heavily reduced (less risk of blocked nozzles). The system further provides that after filling the sprayer with chemicals, the sprayer is immediately charged with chemicals (up to the boom section valves) and the right concentration of chemicals is rapidly available.

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The ring line system is activated automatically when the master valve is closed. When the master valve is opened, valve (E) is closed automatically. The spraying liquid from the spray pressure regulator flows via (G) towards the delivery manifold and flows to different boom section valves (B). If the boom section valves are opened, the liquid flows via feed line (C) towards the spray lines.

When the master valve on the control box is closed, valve (E) is opened automatically. In the meantime, all the section valves (B) are closed. The liquid will flow through all the section valves (B) into ring line (D) which is connected to the valve (E). From valve (E) the liquid will flow back into the tank.

Separate function diagrams of the sprayers with ring line circulation system can be found in "Function Diagram" (section "Operation of the Machine").

A-Feed line from delivery manifold to electrical section valves
B-Electrical boom section valves in boom
C-Feed line towards spray line
D-Ring line
E-Main valve of circulation system
F-Return line to tank
G-Feed line from pressure regulator to delivery manifold
H-Suction valve
I-Pressure selection valve

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The position of the arrow on the handle of the 4-way ball valve indicates the direction from which the liquid is sucked (see illustration).

When the master valve is closed and the 4-way ball valve is set in position (C), the spraying liquid will be drawn into the pump and will also be fed into the ring line sytem.

When the master valve is closed and the 4-way ball valve is set in position (B), rinse water will be drawn from the rinse water tank into the pump and will also be fed into the ring line system.

A-Suction closed
B-Suction of clean water
C-Suction of spraying liquid
D-Suction from external source

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1-Solution tank
2-Rinse tank
3-Suction valve
4-Suction filter
5-Pump

6-Pressure selection valve
7-Primary pressure regulator
8-Electric spray pressure regulator

9-Pressure line filter
10-Boom section valves
11-Electric main shut-off valve (circulation line)

12-Circulation valve
13-Suction
14-Pressureles return
15-Pressure

The circulation system automatically works whenever the pump (5) is running and the Master switch on the

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When the Master valve is closed, the electrically operated 2-way valve (11) is opened to allow circulation.

The manually operated suction 4-way ball valve (3) determines from where the liquid is coming. The spraying liquid is drawn by the pump, flows through the pipes into the ring line circulation system and returns into the solution tank (1).

During agitation and spraying, the 4-way suction valve (3) needs to be in position 2. As soon as the pump (5) is running and the main shut-off valve (11) is opened (Master switch closed), the spraying liquid will start circulating.

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1-Solution tank
2-Rinse tank
3-Suction valve (recirculation)
4-Suction filter

5-Pump
6-Pressure selection valve
7-Primary pressure regulator
8-Electric spray pressure regulator

9-Pressure line filter
10-Boom section valves
11-Electric main shut-off valve (circulation line)

12-Circulation valve
13-Suction
14-Pressure
15-Pressureles return

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As soon as the Master switch on the control box is opened, the circulation system is automatically switched off. The electric 2-way valve (11) will be closed and the circulation stops. With the Master switch at the control box activated and boom section

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1-Solution tank
2-Rinse tank
3-Suction valve (recirculation)
4-Suction filter

5-Pump
6-Pressure selection valve
7-Primary pressure regulator
8-Electric spray pressure regulator

9-Pressure line filter
10-Boom section valves
11-Electric main shut-off valve (circulation line)

12-Circulation valve
13-Suction
14-Pressure
15-Pressureles return

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CAUTION: The rinse tank must always be filled with clean water.

NOTE: Please refer to recommendation on label of chemical product used for cleaning and operator safety.

With the ring line circulation system, it is possible to rinse the spray boom (except spray lines and nozzles) without having to spray. In this way all the undiluted remaining liquid can be flushed back into the solution tank (1) where they can be diluted with clean water, except the small quantity remaining in the spray lines.

Rinse water from the rinse tank (2) can be circulated through the whole machine up to the section valves (integrated in the boom), when the 4-way suction valve (3) is set on "suction from rinse tank". With the Master switch on the control box closed and the pump (5) running, clean water will then be drawn from the rinse tank (2) through the ring line sytem into the solution tank (1).

After rinsing the ring line circulation system, the Master switch on the control box and boom section valves (10) should be opened to clean the spray lines, nozzle holders and nozzles too.

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The following procedure for dilution of the residual spraying liquid and cleaning of the complete sprayer provides important information about:

• Steps which need to be followed to rinse all the different hoses and spray lines properly
• Most effective way to dilute and spray out the residual spray liquid
• Most efficient use of available water of the rinse tank to clean the sprayer

IMPORTANT:

 

Pay attention to the following points:

• Crop protection chemicals and spray solutions which adhere intensely to the tank walls, hoses and spray lines need to be cleaned more intensively with cleaning agents and require longer rinsing.

• Cleaning agents can be added to the rinse tank at the beginning of the cleaning procedure below. (Also see "Cleaning the Machine" in section "Working with the Machine").

• The more rinse water is used, the better the residual spray liquids will be diluted.

• It is recommended to perform the cleaning procedure twice if the machine is strongly polluted (also check the instructions of the chemical products whether any specific cleaning method needs to be considered).

To clean the sprayer thoroughly, the following conditions must be met:

• Crop protection chemicals were completely diluted in the solution tank before spraying was started (i.e. the residual spray liquid has a normal concentration)
• Chemical inductor has been already rinsed and cleaned during the filling of chemicals
• Tank agitation was continuously switched on during spraying

A-4-way pressure selection ball valve
B-4-way suction ball valve
C-Circulation valve
D-Master switch on EL-4 control box
E-Boom section valve switches
F-Electric valve ring line circulation system
G-Return flow from ring line system to tank

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• Solution tank has been sprayed empty as far as possible; at nearly empty tank level, the circulation valve (C) has been set to recirculation (return to suction side of the pump) and, if possible with the chemicals used, the agitation has been switched off with valve (A)
• Suction valve (B) is still set to "suction from solution tank"
• PTO can remain engaged during the complete cleaning procedure

NOTE: Please refer to recommendation on label of chemical product used for cleaning and operator safety.

Follow steps 1-19 to completely clean the sprayer.

Dilution of residual spray liquids:

1.

Close the master valve via the control box (D).

2.

Set circulation valve (C) to circulation (return to suction side of pump).

3.

Set pressure selection valve (A) to tank rinsing nozzles.

4.

Set suction valve of pump (B) to "suction from rinse tank" (switch on PTO at low speed).

5.

Set pressure selection valve (A) during 10 seconds to agitation (and afterwards set it back to tank rinsing nozzles).

6.

Set circulation valve (C) during +/- 30 seconds to return to the tank (and afterwards set it back to circulation).

7.

The spray boom will also be rinsed with clean water (up to the section valves) circulating through the boom supply lines and ring line back into the solution tank.

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8.

Set pressure selection valve (A) to closed position (chemical inductor) to switch off tank rinsing nozzles when 100 liters of rinse water have been used to clean the tank (can be read at level indicator of solution tank).

Spraying out diluted residual spray liquid:

9.

Set the suction valve of pump (B) to "suction from solution tank".

10.

Set the circulation valve (C) to circulation (return to suction side of pump).

11.

Spray the solution tank with diluted residual spray liquid empty by opening the master valve (D) and all section valves (E) via the control box. Operate all boom section valves and optional edge nozzles a couple of times in order to clean the valves as well.

It is recommended to spray the liquid out at a higher speed on the field to minimize overdosages.

Tank cleaning:

12.

Close the master valve and all section valves via the control box.

13.

Set the pressure selection valve (A) to tank rinsing nozzles and set the suction valve of the sprayer pump (B) to "suction from rinse tank".

14.

Suck about 50 liters from the rinse tank to clean the tank.

15.

Set the pressure selection valve (A) to a closed position (chemical inductor) to switch off the tank rinsing nozzles and set the suction valve (B) of the sprayer pump back to "suction from the solution tank".

16.

Spray the solution tank empty by opening the master valve (D) and all section valves (E) via the control box.

Rinse and clean machine:

17.

Set suction valve of sprayer pump (B) to "suction from rinse tank".

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18.

Spray the rinse tank completely empty by opening the master valve and boom section valves.

19.

Finally, set all valves back to spraying position: Agitation must be switched on, circulation valve (C) must be set to "return to tank".

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