Fluidics W1-125-45 nozzle

This Fluidics nozzle, listed under the catalogue article 480.892.087, is an oil nozzle of the type used in pressure-jet oil burners. Such nozzles are precision consumable parts: their function is to atomise the fuel oil into a fine spray cone so that it mixes with combustion air and burns completely. In a typical oil burner, the nozzle is mounted at the end of the blast tube, inside the combustion head, and receives pressurised oil from the pump via a solenoid valve or shut-off valve. The nozzle’s internal swirl chamber and orifice determine the flow rate, spray angle and spray pattern – all three parameters must be selected to match the burner design. For a replacement, the correct combination of flow rating (expressed in USgal/h or kg/h at a reference pressure, typically 7 bar or 10 bar), spray angle (commonly 30° to 80°) and pattern (hollow cone, solid cone or semi‑solid) must be read from the burner data plate. Using a nozzle with the correct flow but the wrong pattern can cause sooting, pulsating flame or unstable ignition. The thread size is also critical; most domestic nozzles use a 1/8" BSP thread, but some burners require different threads. When replacing a nozzle of this general class, always fit a new gasket or O-ring at the nozzle adapter and tighten to the recommended torque – overtightening can distort the orifice, while undertightening can cause leaks. After fitting, check the ignition and combustion settings with a flue gas analyser; a nozzle change may alter the air‑fuel ratio and require a damper adjustment. No further specifications such as exact flow rate, angle or pattern are stated for this particular article – these must be verified from the burner documentation or the original part marking.