De Dietrich 97580616 pilot burner nozzle FU L0.40

The De Dietrich 97580616 pilot burner nozzle (catalogue article 336.736.002) is a component for the pilot burner in a gas-fired boiler or burner system. A pilot burner maintains a small permanent or intermittent flame that ignites the main burner and provides a flame signal for the ionisation electrode. The nozzle meters the gas flow to the pilot burner, determining the size and stability of the pilot flame. Parts of this type are selected by their flow rate (often expressed as a fuel grade and capacity, such as FU L0.40), thread type, and the burner series for which they are intended. The nozzle must match the gas type and pressure supplied to the pilot burner to ensure reliable ignition and flame holding. When replacing a pilot burner nozzle, check the orifice size and thread compatibility with the existing pilot burner body. A nozzle that is too large may cause an unstable or lifted flame; one that is too small may fail to light the main burner or produce a weak flame signal. Also inspect the pilot burner’s electrode gap, ceramic insulation, and gas supply filter, as these affect flame quality. Typical failures include clogging from dirt or debris, erosion of the orifice from high gas velocity, and distortion from overheating. Always use the correct replacement from the same manufacturer to maintain the designed flame characteristics. This De Dietrich nozzle is identified by the manufacturer codes 97580616 and 336.736.002.