Ugello Delavan 1.10 GPH, 80AR (1)

An oil nozzle is a precision consumable component that atomises the fuel oil into a fine spray cone, ensuring complete combustion. It is fitted at the end of the oil gun inside the combustion head. The nozzle's flow rate, spray angle, and spray pattern together determine how the flame sits in the combustion head and how it interacts with the air stream from the fan. Parts of this type are selected by matching three parameters: flow rating in GPH or kg/h at the reference pressure, spray angle (typically 30 to 80 degrees), and spray pattern—hollow, solid, or semi-solid. The thread size must also correspond to the burner's oil gun. Installing a nozzle with the correct rating but the wrong pattern can cause sooting, pulsation, or unstable ignition, so all three parameters must be verified against the burner data plate. This article is a Delavan nozzle with a rating of 1.10 GPH at reference pressure, an 80-degree spray angle, and an AR spray pattern (the specific pattern designation for Delavan). The manufacturer code is PA110-80R1, and the catalogue article is 345.892.299. When replacing a nozzle of this type, always confirm that the flow rate, angle, and pattern match the burner manufacturer's specification for the firing rate and combustion head design. Nozzles are wear items and should be replaced as part of annual burner service to maintain correct atomisation and clean combustion.