Download Manual - Silvan Australia

Description of Fluid Flow
The schematic diagram on the previous page
shows the fluid flow and filtration system of the
RowKING 2500 litre sprayer. A typical four section
spray boom is shown but the operating principles
are the same for booms with three sections.
Tanker Circuit
The tanks can be filled either through the top or
bottom but the usual method is through the bottom
fill connection, which is more convenient and
prevents chemicals from frothing.
The bottom fill incorporates a cam-lever hose
coupling and a high volume filter. It can be used to
fill either the main tank or the two flushing tanks by
turning the handle of the bottom fill valve, below
the filling control panel, to the appropriate position.
During filling, the suction valve must be set to
‘Main Tank’ at the pressure control panel. After
filling, the bottom fill valve is turned to the closed
position and the suction valve is switched to either
‘Main Tank’ or ‘Flush Tank’ to enable fluid to flow
from the selected tank to the pump.
If the top lids are used for filling, a basket strainer
is provided in the fillers of the main and flushing
tanks to prevent entry of foreign material.
The level of liquid in the main tank is shown by a
sightline at the RH front of the sprayer and for
rapid emptying a large diameter outlet discharges
through a manual drain valve under the LH side of
the sprayer. An optional digital fill meter can be
fitted to measure the amount of fluid entering both
the main tank and the flushing tanks.
The hand wash tank is filled by attaching a hose to
its connector.
The liquid to be sprayed is drawn from the
underside of the tank through the suction line to
the inlet side of the pump. A filter in the suction
line ensures that no foreign material enters the
pump. The suction valve on the control panel
should be closed to allow the element to be
removed for cleaning while there is liquid in the
tank. Depending upon the sprayer model, the
pump is directly driven either by the tractor PTO or
by a hydraulic motor connected to the tractor
hydraulics.
Fluid is discharged from the pump to a pressure
relief valve mounted on the pressure control panel.
This valve is manually operated to set the
maximum pressure within the system. The required
spraying pressure can then be regulated from the
control unit in the tractor cab, up to the maximum
set at the manual valve. The gauge on the
pressure control panel shows the system
maximum pressure.
From the relief valve, fluid is directed to the spray
boom at system pressure through a high pressure
filter under the control panel. This filter can be
purged by means of a knob at the filter that opens
a valve connected to a return line to the tank.
Surplus capacity from the pump is by-passed at
the main relief valve. If the boom valves are
closed, or if the pump is producing more volume
than required at the boom, the outlet pressure will
rise until the relief valve opens and the excess is
by-passed to the bottom of the tank, thus keeping
the contents well mixed.
Selecting the agitator valve on the pressure control
panel opens the agitator valve and provides
additional mixing of the main tank contents by
directing pressurised fluid to the venturi jet in the
rear of the tank.
To flush the system with clean water from the
flushing tank, the suction valve on the pressure
control panel is switched to ‘Flush Tank’. To wash
the interior of the main tank the ‘Tank Rinse’ valve
can be opened on the pressure control panel. This
pumps pressurised water to the rotating rinse jet in
the top of the tank and also rinses the main tank
sightline.
Spraying Controls
Fluid from the high pressure filter is directed to the
boom sections via electrically operated on/off
valves in the valve block mounted at the rear of the
sprayer. The valves are operated from the cabin
using the control unit and can be opened or closed
independently by selecting the required section
switches or, once a pattern is selected, as a group
by operating the Master switch that controls the
main on/off valve.
If a spray computer is fitted, the valve block
incorporates a flow meter that is electrically
connected to the spray computer. Once the
spraying pressure and application rate are set they
are monitored by the flow meter and maintained by
the by-pass or throttling action of the pressure
regulator in the valve block.
All Silvan booms are fitted with interchangeable fan
jet nozzles at 50 cm intervals in non-drip bayonet
holders that incorporate a strainer for final filtration.
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