Ugello Delavan 6.50GPH, 60W (7)

This is a Delavan oil nozzle, catalogue article 345.892.012, with manufacturer code 00650-60W7. The designation indicates a flow rating of 6.50 GPH and the code 60W (7). As with all nozzles of this type, it is a precision consumable that atomises fuel oil into a fine spray cone for complete combustion. The nozzle is the final component in the oil train, receiving pressurised oil from the pump via the solenoid valve and, where fitted, a preheater. Parts of this class are selected by three parameters: flow rate at the reference pressure, spray angle, and spray pattern (hollow, solid, or semi-solid cone). The flow rate determines fuel throughput; the angle and pattern together define how the flame sits relative to the combustion head and blast tube. The designation on this nozzle includes these parameters, but an engineer should verify that the actual spray angle and pattern match the burner data plate, not just the number. When replacing an oil nozzle, all three parameters must correspond to the burner setup. A nozzle with the correct throughput but the wrong pattern or angle can cause sooting, pulsation, or unstable ignition. The thread must also match the nozzle holder. No other compatibility information is available from the catalogue entry.