16
SYMBOLS
e symbol:
CAUTION
marking some parts of the text highlights the possible occurrence of damages to people in case the relevant
prescriptions and indications are not complied with.
e symbol:
WARNING
marking some parts of the text highlights the possibility of damages to the control unit, in case the relevant
instructions are not complied with.
TECHNICAL FEATURES AND DATA
e products described in this manual are mainly intended to be applied, together with the alternative positive-
displacement (diaphragm or piston) pumps, onto machines for protective treatments of agricultural crops or
onto water and water solution pumping systems (also refer to paragraph
“INTENDED USE”
).
e
pump control unit
is the unit made up of a pressure unloader/regulation valve and shut-o/distribution
devices of the pumped liquid (e.g. taps).
A
pressure unloader/regulation valve
is a device allowing to regulate the working pressure and the pumped
uid to ow back towards the by-pass duct of the pump, so preventing dangerous pressures to arise, when
the delivery is closed or when pressure values are set which are higher than the maximum permitted values.
In this manual, for sake of simplicity, the
pressure unloader/regulation valve
will be referred to as
unloader
valve
and the
pump control unit as control unit.
A
constant-pressure regulation valve
keeps the set-up pressure substantially unchanged when the rotation
speed of the pump to which it is connected varies. As a consequence, the delivery of product depends on the
forward speed of the machine. e higher is the machine speed, less product will be delivered and vice versa.
A
(proportional)
positive-displacement
regulation valve
operates so as to vary the pressure proportionally to
the ow rate and therefore to the rotation speed of the pump it is connected to. is causes constant product
delivery, regardless of the forward speed of the machine, if the same gear ratio is used. is applies to pump
speed variations which are within ± 10% of their initial value.
e
anti-dripping eddy
is a device allowing to stop immediately the product delivery through an accessory,
thus avoiding useless dripping. It is recommended to use anti-dripping lters or anti-dripping diaphragm
nozzles to ensure a perfect working of the anti-dripping eddy.
CAUTION
• e values of maximum pressure and ow rate shown in the table below refer to high performance models.
Depending on the eld of use, models with dierent performance are also available.
Always check and never
exceed the values of maximum pressure and ow rate of the control unit shown on the identication
plate.
PERFORMANCE
MASS
MAXIMUM FLOW RATE MAXIMUM PRESSURE
VR 10
50 l/min - 13,2 US gpm 10 bar - 145 psi 0,3 kg - 0,7 lb
VR 15
50 l/min - 13,2 US gpm 15 bar - 218 psi 0,5 kg - 1,1 lb
Centralina 4V/6V
150 l/min - 39,7 US gpm 20 bar - 290 psi 2,0 kg - 4,4 lb
Hydra
50 l/min - 13,2 US gpm 25 bar - 362 psi 0,9 kg - 2,0 lb
Sirius
50 l/min - 13,2 US gpm 40 bar - 580 psi 0,9 kg - 2,0 lb
Polaris
50 l/min - 13,2 US gpm 40 bar - 580 psi 1,2 kg - 2,6 lb
Gemini
50 l/min - 13,2 US gpm 40 bar - 580 psi 0,9 kg - 2,0 lb
(continued on next page)