Delavan 40.00GPH, 80B nozzle

An oil nozzle is the component that atomises fuel oil into a fine spray so that it mixes with combustion air and burns completely. It is a precision consumable part: the flow rating, spray angle and spray pattern together determine how the flame sits inside the combustion head. Nozzles of this type are selected by matching the flow rate (in gallons per hour or kilograms per hour at the reference pressure), the spray angle (typically between 30 and 80 degrees) and the spray pattern (hollow cone, solid cone or semi-solid). All three parameters must agree with the burner data plate. A nozzle with the correct flow but the wrong pattern can cause sooting, pulsation or unstable ignition. Replacement of an oil nozzle is straightforward but requires care to avoid damaging the precision orifice. The nozzle thread should be clean and the seating tightened to the specified torque. Because nozzles are consumable, they should be replaced at every annual service or sooner if the burner shows signs of poor combustion, such as a smoky flame or oil drip after shutdown. The manufacturer code and catalogue article are the unambiguous identifiers when ordering – always compare the existing nozzle’s markings with the part number on the burner data plate. The article listed here is a Delavan nozzle. Use the manufacturer code 04000-80B0 or catalogue article 345.892.240 when sourcing a replacement. Ensure the flow rating, spray angle and pattern match the burner specification before fitting.