A L P H A 2 5 0 0
S P R AY I N G S TAG E S
CHAPTER
4- 2
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01/02
Semi-continuous circulation is generally suitable for delivery lower than 200 l/ha. Because of a cir-
culation rate two or three time greater than that in normal circulation, there is no sedimentation of
the products in the piping and therefore no blocking of nozzles.
However, circulation of the fluid in the boom section is not carried out when spray stops.
In semi-continuous circulation, the pump delivery is distributed between :
- The spray boom equipped with nozzles.
- Return to the tank via the calibrated nozzles (CN).
- Return to the tank via the regulating valve DG4 operated by the Regulor.
When spray stops, the remote valves are closed. All the delivery from the pump returns directly to
the tank through the regulating valve.
Semi-continuous circulation is generally suitable for delivery lower than 200 l/ha. Because of a cir-
culation rate two or three time greater than that in normal circulation, there is no sedimentation of
the products in the piping and therefore no blocking of nozzles.
Circulation of the fluid is carried out in the spray piping when spray stops.
1
Tank
2
Type DG4 regulating valve
3
Type Heliflux Flowmeter
4
Boom manifold
2
3
4
5
6
7
5
Type TVI remote valve
6
Spray pump
7
Boom section
1
8
Manual valve
9
Calibrated nozzles
8
9
4-
1
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2
SEMI-CONTINUOUS CIRCULATION
4-
1
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2
CONTINUOUS CIRCULATION (OPTION)
