18
Pressure Gauges
Testing has shown that there is a pressure
loss between the pressure gauge on the
manual regulator and the pressure at the spray
nozzles, hence the second pressure gauge,
which is plumbed into the motorised valves at
the back of the sprayer.
When using the spray boom, please follow
the gauge labelled ‘spray pressure’, and when
using the hose reel, venturi probe etc, please
follow the ‘bypass pressure’ gauge.
Above:
Spray control station. All taps are
closed, and the dump valve is open providing
low pressure agitation when pump running.
Dump valve
A dump valve and manual pressure regulator
are fitted to the control station. The dump
valve enables all pump delivery to bypass
back to the tank under low pressure. The
dump valve should be opened to agitate the
tank when not spraying. It is also a good
practise when starting the sprayer to have the
dump valve open. To open the dump valve,
simply push the red handle back towards the
tank. To close the dump valve, pull the red
handle forwards bringing the handle out.
All sprayer functions including boom
operation, hose reel or suction probe will not
operate with the dump valve open to bypass
(picture 3 showing the dump valve open).
Pressure regulator
The manual pressure relief valve provides
pressure adjustment for the various sprayer
functions. To increase the pressure for hand
gun operation, or operating the venturi probe
for instance, turn the pressure regulator
clockwise, which will wind more pressure on
the spring inside the regulator.
Any adjustment to the pressure setting of the
relief valve will correspond with a change in
the pressure gauge reading fitted to the control
station.
It is advisable to set the pressure regulator
at around 7 bar pressure for boom spray
operation, and use the electric pressure toggle
switch on the control console to adjust the
pressure back down to the desired spraying
pressure.
Above:
Manual pressure regulator with
directional indicators.
