Micron Technology Turbofan - Manual (Page 17)

DRAFT
16
If a new sprayer is being designed or an original pump is to be replaced, it is suggested
that a diaphragm or centrifugal type is chosen. This should be able to provide a pressure
of about 1 – 3 bar (15 – 45 psi) and should be capable of delivering the maximum flow
rate of the sprayer plus the flow required for tank agitation (if a mechanical agitator is not
used). An output of 60 l/min is satisfactory for most low volume sprayers without
mechanical agitation.
A chemical on/off valve must be fitted in the main feed to the sprayheads. This may be
mechanically or solenoid operated. A multi-position valve can be used to select different
groups of sprayheads if required.
A filter must be incorporated in the chemical supply to the sprayheads. This should have
an 0.5 mm (50 mesh/inch) or finer mesh filter. The filter may be installed either in the
suction or pressure line of the pump but the filter must always be before the flow
restrictors and should preferably be before the pressure regulator. Fig 8 shows the
recommended chemical feed configuration for a typical sprayer.
Figure 8. Typical configuration of chemical feed to heads
SPRAY HEADS
FLOW
RESTRICTORS
PRESSURE
GAUGE
CHEMICAL
TANK
RETURN LINE TO AGITATOR
SUCTION STRAINER
CHEMICAL PUMP
ON/OFF AND
PRESSURE
CONTROL
VALVE