The invention realizes an improved hydraulic circuit (1) for stoking, prewashing, preheating and atomizing the petroleum naphtha in a burner (2), including: a fuel pump (3) picking the petroleum naphtha contained in a tank; a pressure regulator (6); a preheater (7); a gasproof valve (8) and a valve unit (9) for the stoking of said burner (2) and the petroleum naphtha blow-by in said tank. Said valve unit (9) includes two stoking vales (91, 92) of said burner (2) with a solenoid control (191, 192, 193). Said stoking valves (91, 92) are connected in series to a blow-by valve (93).
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