Delavan 1.65GPH, 45W (1) nozzle

This is an oil nozzle from Delavan, a precision consumable part used in oil burners. The nozzle atomises fuel oil into a fine spray cone so that it can mix with combustion air and burn completely. Such nozzles are fitted into the combustion head of an oil burner, where they work together with the oil pump and the solenoid valve—the pump delivers oil at pressure, and the nozzle’s internal swirl chamber and orifice produce the required spray pattern and droplet size. In the burner system, the oil nozzle is the final point before the flame; therefore its condition directly affects combustion quality. Parts of this type are selected by three parameters: flow rate (given in gallons per hour, GPH, at a reference pressure), spray angle (typically between 30° and 80°), and spray pattern (hollow cone, solid cone, or semi-solid). All three must match the burner manufacturer’s specification as shown on the burner data plate. Using a nozzle with the correct flow rate but an incorrect spray pattern can lead to sooting, pulsation, or unstable ignition, and a mismatched angle may cause the flame to impinge on the combustion head or heat exchanger. When replacing an oil nozzle, it is good practice to also replace the gasket or O-ring on the nozzle adapter and to check that the electrode gaps and position relative to the nozzle remain within the burner manual. The manufacturer code for this unit is P0165-45W1 and it is listed under catalogue article 345.892.062.