Delavan 4.50GPH, 60W (7) nozzle

This is a Delavan oil nozzle, listed under catalogue article 345.892.037 and manufacturer codes 00450-60W7 and 3042187. The product name is Delavan 4.50GPH, 60W (7) nozzle. It belongs to the category of oil nozzles, which are precision consumable parts used in oil-fired burners. An oil nozzle atomises the fuel into a fine spray cone so that it mixes with air and burns completely. The flame shape and stability depend on three parameters that must match the burner data plate: flow rate (expressed in US gallons per hour or kg/h at the reference pressure), spray angle (typically between 30° and 80°), and spray pattern (hollow, solid, or semi-solid). A nozzle with the correct flow but wrong pattern can cause sooting, pulsation, or ignition failure. The thread size must also be compatible with the burner adapter. When replacing an oil nozzle, always verify that all three parameters match the burner manufacturer’s specification. The nozzle is a wear item and should be changed at every annual service to maintain combustion efficiency. Handle it carefully, as any damage to the orifice alters the spray geometry.