Steinen 2.50GPH, 60S nozzle

This is an oil nozzle from Steinen, catalogue article 908.892.050, manufacturer code 2.50GPH,60S. It belongs to the group of precision consumable parts that atomise fuel oil into a fine spray cone so it can mix with air and burn completely. Parts of this type are selected by three parameters: flow rate (given in GPH at the reference pressure), spray angle (typically 30 to 80 degrees), and spray pattern (hollow, solid, or semi-solid). The thread is also specified for compatibility with the burner's nozzle holder. Using a nozzle with the correct rating but a wrong pattern or angle can cause sooting, pulsating flame, or unstable ignition, so all three parameters must match the data on the burner plate. The nozzle is installed in the combustion head and receives fuel from the oil pump via the solenoid valve and, on some burners, a preheater. During the ignition sequence, the burner control energises the pump solenoid, pressurised oil reaches the nozzle, and the nozzle atomises the fuel into the air stream created by the fan. The resulting spray must be fully within the combustion head to avoid flame impingement and ensure clean burning. When replacing a nozzle of this type, confirm the GPH rating, spray angle, and pattern against the burner manufacturer's specification. Also check the thread type and the condition of the nozzle holder sealing surfaces.