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unigreen 13
Pressure regulators with a volumetric valve (GCP ELETTRICO)
Adjusting the maximum pressure valve
= put main control A in the drain position (“OFF”).
= loosen the hand wheel of maximum pressure valve B completely
(anticlockwise).
= open volumetric valve E completely.
= start the pump by activating the power-takeoff of the tractor at 540rpm
= open main control A (position “ON”), the manometer will be activated
= open the drain tap on filter F slightly (only GCP ELETTRICO).
= close volumetric valve E completely. If the pressure rises over the
maximum limit of the system, make sure maximum pressure valve B is open
(see previous indications)
= open all of the section valves C (position “ON”)
= adjust maximum pressure valve B to a value over that of the working
pressure (generally 10-14 bar) and in any case lower than the safe maximum
pressure that the system can reach.
Adjusting the volumetric pressure.
= with the volumetric pressure valve E adjust the pressure to the value the
treatment will be done at (the pressure is indicated on the nozzles tables on
the basis of the tractor speed and litres/hectare to spray)
Warning! The working pressure must be adjusted with the volumetric
valve and not with the maximum pressure valve. In the case the
working pressure is too near to the calibrated pressure of the
maximum pressure valve, the proportional valve may not be able to
compensate the speed variations correctly.
Adjusting the compensated returns
= close only one tap of section C (position “OFF”).
= adjust the corresponding compensator G until you return to the pressure
set previously (displayed on the manometer).
= open and close the tap of section C and check that the pressure remains
constant.
= repeat the above operations for all the section taps.
If the types of nozzles aren’t changed the regulations carried out will guarantee
a constant spraying of the liquid also per treatments that are done at different
working pressures.
NB: if the type of nozzle is changed then the calibrating will have to be done
again.
4.9 DELIVERY FILTERS (ONLY EQUIPPED MODELS)
This is particularly useful when using small nozzles (low volume), they are
normally mounted on the jet booms and have a filter cartridge with a 40-gauge
mesh (the equivalent of a 0.4 mm hole).
In the RV version, the standard cartridge has a 86-gauge mesh (the equivalent
of a 0.25mm hole) and another manometer is mounted after the cartridge to
make fault-finding easier.
At the end of each treatment cycle you should clean the cartridge: turn the
jets to the closed position, put the command under pressure and open the tap
under the filter to drain the tank for a few minutes.
You should clean the cartridge by hand periodically, on the basis of the
product used. Stop the pump to clean. Wear rubber gloves and the other
personal protective equipment when cleaning.
FIG. 9
40 mesh RV 86 mesh
+ filter