De Dietrich S103172 burner sealing

This De Dietrich S103172 catalogue entry is for a burner sealing part, listed under boiler filters, gaskets and seals. Parts of this type are routine consumables replaced during a service visit. They maintain the airtight separation between the combustion chamber, the burner assembly, and the surrounding environment. On a typical burner, the sealing element sits at the flange joint where the burner head meets the boiler door, or around the blast tube where it passes through the door. Its function is to prevent flue gas leakage into the boiler room and to stop false air being drawn into the combustion zone, which would upset the air‑fuel ratio and reduce efficiency or cause safety lockouts. When selecting a replacement sealing of this class, the critical factors are the exact dimensions – outer diameter, inner diameter and thickness – and the material grade, which must match the operating temperature and the medium (usually flue gas or ambient air). Common materials for such applications are fibre, graphite or silicone. Unlike a repair kit, which is compiled for a specific valve or regulator series, a burner sealing is a single element; it is not interchangeable across different burner models. Before ordering, verify the physical fit against the existing part and confirm that the material is rated for the continuous temperature at the joint.