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The electrical operation group comprises a pressure regulator, main shut-off valve, boom section valves and a control box. The return liquid from the primary pressure regulator is displaced to the spray pressure regulator via a pressure hose. The pressure regulator deposits the superfluous spray liquid back into the
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solution tank, pressureless. On opening the main and boom section valves, the liquid is displaced from the pressure regulator via the pressure filter on the left front side of the machine to the spray nozzles, at the set spraying pressure.
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