HD 1050 Unit function
5
4. High-pressure cleaning without
detergent
The water is pumped through the injector to the
3-way nozzle. The pressure at which the water
leaves the nozzle depends on the size of nozzle
bore, the larger the bore, the lower the pressure
and vice-versa.
5. Low-pressure cleaning with detergent
With the 3-way nozzle switched to low-pressure
(large nozzle bore), the water passes at high
speed through the injector and this results in a
reduction in pressure (vacuum) at the detergent
hose connection. Such a vacuum in only
generated if the bore of the nozzle is larger than
the bore of the injector.
The vacuum thus generated causes detergent
to be drawn through the detergent non-return
valve and detergent metering valve, to be mixed
with the water delivered by the pump.
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