HOW DOES A KNAPSACK SPRAYER WORK?
When operating the sprayer, liquid is drawn through the inlet valve into the pump chamber on the up stroke.
On the down stroke, liquid in the pump chamber is forced through the outlet valve into the pressure chamber.
The inlet valve between the tank and the pump is closed during this operation to prevent the return of liquid to the tank.
Air trapped in part of the pressure chamber and compressed as liquid is forced into the chamber.
The compressed air forces the liquid from the pressure chamber through the hose to the nozzle.
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A knapsack is a type of sprayer that disperses liquid through a hand-held nozzle and used to apply liquids such as fertilisers, herbicides and fungicides
