Delavan 0.85GPH, 60W (5) nozzle

This is an oil nozzle from Delavan, a precision consumable component used in oil burners. The nozzle atomises fuel oil into a fine spray, enabling complete combustion within the combustion head. Parts of this type are selected by three parameters: flow rate (given in US gallons per hour – GPH – at a reference pressure), spray angle (typically between 30 and 80 degrees), and spray pattern (hollow, solid, or semi-solid). The combination of these three values determines how the flame sits relative to the blast tube and the combustion chamber. When replacing an oil nozzle, all three parameters must match the burner manufacturer’s specification. A nozzle with the correct flow rate but a wrong pattern or angle will cause sooting, unstable ignition, or pulsation. The nozzle is a wear item and should always be replaced as part of a burner service, never cleaned for reuse. Thread size must also match the nozzle adaptor on the burner; common threads are 1/8" BSP or NPT. The nozzle works in sequence with the oil pump, solenoid valve, and preheater (if fitted). It is located behind the blast tube, at the end of the nozzle line. No further specific data is available for this article beyond the name and codes listed. Always verify the GPH rating, spray angle, and pattern against the burner data plate before ordering.