Delavan 6.00GPH, 45B (7) nozzle

This is a Delavan 6.00GPH, 45B (7) oil nozzle, listed under catalogue article 345.892.203 and manufacturer codes 00600-45B7, 3042211, and 345.892.203. It belongs to the category of oil nozzles, which are precision consumable components in oil-fired burners. An oil nozzle atomises the fuel into a fine spray cone so that it can mix with combustion air and burn completely. Parts of this type are selected by three parameters: flow rate (here 6.00 GPH at the reference pressure), spray angle (45 degrees), and spray pattern (indicated by the B designation, typically hollow, solid, or semi-solid). The thread size is standard for such burners. All three parameters must match the burner data plate; a nozzle with the correct flow rate but wrong pattern can cause sooting, pulsation, or unstable ignition. When replacing a nozzle, always verify the existing part number or the burner manual to ensure the rating, angle, and pattern are identical. Because the nozzle is a wear item, it should be inspected annually and replaced if the spray pattern is distorted or if the burner shows signs of poor combustion such as smoke or unburnt fuel.