Delavan 4.50GPH, 80W (7) nozzle

This is a Delavan oil nozzle, catalogue article 345.892.194, also referenced as 00450-80W7. It belongs to a range of precision consumable parts that atomise fuel oil into a fine spray cone for complete combustion. The nozzle’s flow rating, spray angle and spray pattern together determine how the flame sits in the combustion head. For this specific article, the rating is 4.50 GPH and the spray angle is 80 degrees, with a pattern code indicated by the designation. The (7) may refer to a specific pattern variant, but the exact meaning should be confirmed from the burner data plate or manufacturer documentation. When selecting a replacement nozzle of this type, all three parameters must match the burner specification. A nozzle with the correct flow rate but wrong pattern can cause sooting, pulsation or unstable ignition. The nozzle is fitted into the oil supply line between the pump and the combustion head; it works with the solenoid valve and preheater where applicable. Because it is a precision component subject to wear, it should be replaced periodically as part of routine burner maintenance. Verify thread type and dimensions against the existing nozzle before installation.