Delavan Oil nozzle 30609-002

The Delavan 30609-002 is an oil nozzle, a precision consumable part that atomizes fuel oil into a fine spray cone for complete combustion. It is mounted at the end of the blast tube in an oil burner and fed by the oil pump via a solenoid valve. This nozzle determines three key flame characteristics: flow rate, spray angle, and spray pattern (hollow, solid, or semi-solid). These parameters must match the burner manufacturer's specification for stable ignition and combustion.

When selecting a replacement oil nozzle, verify the rating (flow rate at a stated reference pressure, usually given in USgph or kg/h) against the burner data plate. The spray angle typically ranges from 30 to 80 degrees; the correct angle ensures the flame does not impinge on the combustion chamber walls or the blast tube. The pattern (hollow, solid, or semi-solid) controls fuel droplet distribution across the flame front. Consider the nozzle thread size (most commonly 1/8 in. BSP or NPT) and the oil pump pressure rating, as flow is rated at a specific pressure (usually 100 psi or 7 bar for domestic burners). Always replace with a nozzle of identical rating, angle, and pattern.

A dirty or worn oil nozzle causes incomplete combustion, increased flue gas temperature, and carbon buildup on ignition electrodes. Symptoms include sooting, pulsation, hard ignition, or unstable flame holding. Inspect the nozzle screen (integral strainer) for blockages before installation. Mixing parameters risks burner lockout or damage to the heat exchanger.