Steinen 6.50GPH, 45SS nozzle

The oil nozzle is the component that atomises fuel oil into a fine spray so that it burns completely in the combustion head. It is a precision consumable part: the nozzle’s flow rate, spray angle and spray pattern together define how the flame sits relative to the blast tube and the heat exchanger. In the oil train, the nozzle is fed by the pump via the solenoid valve; on burners with a preheater, the oil is warmed before reaching the nozzle. Correct atomisation is essential for stable ignition, clean combustion and efficient heat transfer. Parts of this type are selected by three parameters: flow rate (expressed in USGPH at the reference pressure, typically 100 psi or 7 bar), spray angle (commonly between 30° and 80°), and spray pattern (hollow, solid or semi-solid). The thread size must match the nozzle adapter in the burner head. If any of these parameters is changed without reference to the burner data plate, the flame shape shifts and can cause sooting, pulsation or ignition failure. A nozzle of the correct rating but wrong pattern will produce an unstable flame, so the whole set of values must always be verified against the burner manufacturer’s specification. The catalogue lists this article as a Steinen 6.50GPH, 45SS nozzle. As with any replacement, confirm that the flow rate, spray angle and pattern on the burner data plate match the values implied by the part designation. The nozzle gasket should be replaced at the same time, and the nozzle should be handled with clean hands and tools to avoid blocking the orifice.