Delavan 0.85GPH, dysza typu „60W” ()

This is an oil nozzle from Delavan, part of the catalogue category for oil nozzles. Parts of this type serve to atomise fuel oil into a fine spray, enabling complete combustion in the burner. They are precision consumable items; the flow rating (in GPH or kg/h at a reference pressure), spray angle (typically 30–80 degrees), spray pattern (hollow, solid or semi-solid) and thread size together determine how the flame is shaped within the combustion head. Selecting a nozzle with the correct rating but an inappropriate pattern can lead to sooting, flame pulsation or unstable ignition, so all three parameters must match the burner’s data plate. In an oil-fired system, the nozzle is supplied by the oil pump through a solenoid valve and sometimes a preheater. The burner control energises the pump solenoid to admit fuel, and the nozzle delivers a metered cone into the air stream from the fan. A UV or IR flame detector verifies that ignition has occurred within the safety time. Because the nozzle is a wear item subject to coking and erosion, it should be replaced annually or according to the burner manufacturer’s service schedule. When sourcing a replacement, the engineer must confirm the flow rate, spray angle and pattern exactly as specified for the burner, not rely on the nozzle’s physical appearance alone. The manufacturer codes for this article are 00085-60W1 and 345.892.258.