Delavan 1/8 standard nozzle adapter

This Delavan item is a nozzle adapter for oil burners, identified by manufacturer codes 28737-001 and 345.106.003 (catalogue article 345.106.003). It carries the thread size designation 1/8 and is listed in the oil nozzles category. A nozzle adapter provides the threaded connection between the oil supply line and the oil nozzle itself. It holds the nozzle in place within the burner’s nozzle assembly and ensures a leak-free seal under fuel pressure. Oil nozzles are precision consumables that atomise fuel into a fine spray; the spray angle, pattern (hollow, solid, semi-solid) and flow rate (GPH or kg/h at reference pressure) must all match the burner data plate. The adapter, however, is a fitting that does not directly affect the spray characteristics. When replacing an adapter, the critical parameter is the thread size: both the nozzle thread and the burner-side thread must match. The 1/8 designation on this part indicates the thread size, but you should verify the thread standard (e.g. BSP, NPT) against the existing installation. Use this adapter with the corresponding oil nozzle and ensure the assembly is tightened to the manufacturer’s recommended torque. A loose or mismatched adapter can cause leakage or disrupt the oil supply, leading to poor atomisation or unstable ignition. Always check the condition of the sealing surfaces and replace the adapter if damaged or corroded.