6
2.2
Functions of components
1
Maximum pressure valve
Eliminates the excess liquid when the set pressure level is reached.
Can be adjusted manually using the appropriate knob; the knob has a different colour according to
the maximum pressure for the valve (refer to par. 7.1 - Correspondence between valve parts and
maximum valve pressure).
2a / 2b
Proportional electric valve / proporzional valve
When adjusted with the knob or switch on the unit control (e.g. control box or computer), the unit
controls the spraying pressure: when the vehicle progress speed changes during spraying, the
volume of the liquid distributed per surface unit (litres/ hectare) remains stable.
The increase or reduction in delivery is proportional to the number of revs of the engine with a
tolerance of +- 20%.
3
Discharge valve
It controls product flow through the system.
Gearmotor is operated via a suitable switch installed on the control device of the unit (e.g.: control
box or computer).
• Discharge valve open
= liquid sent to the tank;
the suction system, if present, starts functioning.
• Discharge valve closed
= liquid sent directly to the circuit for application;
4
Filter
Protects nozzles from dirt, which would eventually reduce their performance.
If the filter is not of the recirculating type, the filter cartridge need not be washed as frequently.
5
Boom section electric valves
Open/close the corresponding section; for valves with metered by-passes, the valve closed position
is the same as the discharge position for the respective metered by-pass.
6
Metered by-passes
These are adjusted so the level of spraying pressure remains steady when one or more sections
of the boom are closed.
7
Pressure gauge adapter or pressure transducer connection (supplied on request)
Connector to which the pressure gauge or pressure transducer mounts, for monitoring the operating
pressure when the discharge valve is closed.
Details of operation will follow: about how to adjust single components, please read
cap. 4 - Setting before use and cap. 5 - Use; for information on suitable control devi
-
ces, please read par. 3.4 - Connection to control devices.
