Control Unit - Croplands WEED-IT Quadro User Manual

The WEED-IT will work with any type of pump, as long as it provides the required amount of
liquid to feed all the nozzles along the boom. To maintain the pressure to all these nozzles,
the system needs a PAV / Ramsay valve (pressure accumulator, membrane valve) in the
spray line. It is controlled by a small air compressor. If the spraying system already has an
air compressor, this can also be used for the WEED-IT system. The PAV / Ramsay valve
equals the liquid pressure to the air pressure. To get the desired pressure, an air regulator is
installed between the air compressor and the PAV / Ramsay valve. The unused fluid flow
goes back into the tank via a return line (dump line).
Make sure that the primary valve (used to draw the liquid from the tank) and
all couplings are absolutely water tight. Even the smallest leak will cause
pressure variations or even pump failure. Leakage may also cause 'dripping'
from the nozzles, instead of spraying. For all valves and fittings use plastic,
stainless steel or chromed brass. Never use galvanized fittings, as the use of
herbicides will cause corrosion.
Figure 3-2 Flow in a standard WEED-IT installation

3.2 Control unit

Use the Control unit to control the WEED-IT system.
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