Steinen 4.00GPH, 45S nozzle

This is an oil nozzle, type 4.00GPH, 45S, manufactured by Steinen. Parts of this class are precision consumables used in oil burners to atomise fuel into a fine spray cone, ensuring complete combustion. The nozzle is fitted on the burner’s blast tube and is fed by the oil pump; the pump solenoid controls fuel admission, and a preheater may be used for heavy oil. The spray pattern, flow rate and angle together determine how the flame sits in the combustion head. Selection for a specific burner must match all three parameters to the data plate: flow rate in GPH at the reference pressure, spray angle (typically 30–80 degrees), and pattern (hollow, solid or semi-solid). Using a nozzle with the correct rating but wrong pattern can cause sooting, pulsation or unstable ignition. The catalogue article is 908.892.063; the manufacturer code is 4.00GPH,45S, 908.892.063. When replacing an oil nozzle, verify that the GPH rating, angle and pattern correspond exactly to the burner manufacturer’s specification. The nozzle thread and pressure rating are also part of the selection, but those are not stated here; consult the burner manual or the part’s packaging for full details.