De Dietrich 85565629 nozzle 220B

This article is a gas nozzle, listed under the De Dietrich brand with manufacturer codes 85565629 and 336.736.004, and catalogue article 336.736.004. The part is identified as nozzle 220B, falling within the category of gas nozzles and injectors for industrial burners and boilers. Gas nozzles of this type are installed in the burner mixing head, where they meter and direct the gas flow into the combustion air stream. They work together with the gas valve train, the fan, and the combustion head geometry. The nozzle is typically located downstream of the gas valve and upstream of the burner head's mixing zone. In premix burners, the nozzle may be part of the gas/air mixing assembly; in nozzle-mix burners, it injects gas directly into the air stream. Selection of a replacement nozzle depends on the burner manufacturer’s specification for gas type (natural gas, LPG, biogas), burner output, and the required gas pressure at the nozzle inlet. The nozzle orifice size determines the flow rate at a given pressure, so it is critical to match the original part for correct combustion and emission compliance. When replacing, ensure the sealing surfaces are clean and that the nozzle is tightened to the correct torque to avoid leaks. Always verify compatibility with the burner control and gas pressure switch settings after installation.