Delavan 5.00GPH, 45W (7) nozzle

This article is a Delavan oil nozzle identified as 5.00GPH, 45W (7) and listed under catalogue article 345.892.067, with manufacturer codes 00500-45W7, 3042188 and 345.892.067. It belongs to the category of oil nozzles, which are precision consumable parts used in oil burners. Parts of this type atomise fuel oil into a fine spray so that it mixes with air and burns completely. The spray pattern, spray angle and flow rate together determine how the flame sits inside the combustion head. Burners of this class rely on the nozzle to deliver a consistent droplet size and shape; even a small deviation can affect ignition stability, flame shape and soot formation. When replacing such a nozzle, the flow rate (usually given in US gallons per hour or kilograms per hour at the reference pressure), the spray angle (typically between 30° and 80°) and the spray pattern (hollow cone, solid cone or semi-solid) must all match the burner data plate. Using the correct rating but the wrong pattern can cause pulsation, sooting or unstable ignition. The thread size also must fit the nozzle holder. All three spray parameters are critical for proper combustion.