Hardi 674737-95/9 Manual De Instruccion página 9

Self-Cleaning Filter
GB
Description
The object of the self-cleaning filter is to continuously filter the impuri-
ties of the spray liquid so that these impurities are led back to the tank
through the hose mounted at the bottom of the self- cleaning filter.
The filter, being mounted on the pressure side of the pump between
the pump and operating unit, consists of a double filter screen which is
placed around a conical guide cone. The liquid is led in from the pump
at the wide part of the cone and when passing further on through the
narrow part of the cone the flow velocity increases.
The increased flow velocity within the filter scours the sediment from
the filter and feeds it back to the tank. The filtrate is passed into the
operating unit through the outlet at the side of the self-cleaning filter. If
the filter blocks, a safety valve begins to function when the pressure
reaches 12 bar. This is situated on the tank front wall.
In order to achieve an optimum cleaning effect the flow through the
filter should be as large as possible, relative to pump size and spray
pressure. Four sizes of restrictors in green, black, red, and white are
fitted, depending on pump used and flow required.
When the tank is emptied and to be refilled again it is important to rinse
the impurities which might be at the bottom of the tank through the
drain valve.
Mounting
For convenience the self-cleaning filter can be mounted most appropri-
I.
ately for instance on the tank base (see drawing ) or operating unit
bracket. The large variety of sprayer models as well as use of other op-
tional extras mean that the site will be individual from sprayer to
sprayer.
The spring-loaded safety valve which is mounted on the tank, can be
sited in a convenient place. It is important that the tank wall fitting is
located on a flat area so as to achieve a watertight seal. A 45 mm hole
II.
is bored. Mounting of the safety valve is shown on drawing
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