ARAG Electriccontrol unit for crop-spraing application 871 - Manual (Page 29)

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7 TECHNICAL DATA
The units described in this manual can use two different systems of distribution depending on the
parts that they are composed of:
• Constant pressure distribution:
in these units have no proportional valve therefore the adjustment function is carried out by the
maximum pressure valve located on the main control valve.
After the operating pressure has been adjusted, the unit’s flow rate remains constant, therefore the
vehicle progress speed must also remain constant in order to have uniform distribution per surface
unit (litres / hectare or GPA).
• Distribution in proportion with engine revs:
the proportional valve installed on these units safeguards uniform distribution of spraying over the
surface unit (litres/ hectare or GPA), even with variations of + 20% in the progress speed provided
the same gear is maintained.
7.1 Correspondence between valve parts and maximum valve pressure
TIPO DI VALVOLA
TERMINAL
STRIP CO-
LOR
PRESSURE
REMARKS
BAR PSI
MAIN
871-864 SERIES
Black 10 145
--
Green 20 290
Blue 30 435
MAXIMUM PRESSURE
863-865 SERIES
Black 10 145
Green 20 290
Blue 30 435
Orange 40 580
Red 50 725
PROPORTIONAL
863 SERIES
Yellow 40 580 Open / close time 14 sec.
Gray 40 580 Open / close time 7 sec.
873 SERIES
Yellow 20 290 Open / close time 14 sec.
Gray 20 290 Open / close time 7 sec.
BOOM SECTION
863 SERIES Blue
10 145
Hose tail
Ø 19 - 25 mm
Hose tail
Ø 3/4" - 1" inches
20 290
Hose tail
Ø 10 - 13 - 16 mm
Hose tail
Ø 3/8" - 1/2" - 5/8" inches
40 580 Brass 1/2” fitting
873 SERIES Blue 20 290
Hose tail
Ø 19 - 32 mm
Hose tail
Ø 3/4” - 1” 1/4 inches