Delavan 0.70GPH, 60B (1) nozzle

An oil nozzle is the component that atomises fuel oil into a fine spray so it can mix with combustion air and burn completely. It is a precision consumable: the flow rate, spray angle and spray pattern together determine how the flame sits in the combustion head. Nozzles of this type are selected by flow rate in GPH (or kg/h) at the reference pressure, by the spray angle (typically 30–80 degrees), and by the spray pattern – hollow, solid or semi-solid. All three parameters must match the burner data plate; a correct flow rate but wrong pattern can cause sooting, pulsation or unstable ignition. The nozzle thread must also be compatible with the burner’s nozzle adapter. This article is a Delavan oil nozzle with the designation 0.70GPH, 60B (1). The name indicates the nominal flow rate, spray angle and pattern, but these values must be verified against the burner manufacturer’s specification. When replacing a nozzle, check that the replacement carries the same combination of flow rate, angle and pattern as the original part. The nozzle is a wear item and should be changed at every annual service or whenever combustion readings drift.