Delavan 0.75GPH, 60W (1) nozzle

This Delavan nozzle is of the type that atomises fuel oil into a fine cone for complete combustion. It is a precision consumable part: the flow rate, spray angle and spray pattern together determine how the flame sits inside the combustion head. For this article the catalogue lists a rating of 0.75 GPH and the designation 60W, which refers to the spray angle and pattern as defined by the manufacturer. Such parts are selected strictly against the burner data plate – all three parameters (flow rate, angle, pattern) must match the burner specification. A nozzle of the same rating but wrong pattern can cause sooting, pulsation or unstable ignition. The thread size and type must also be confirmed when replacing. Because any change in atomisation alters the flame geometry, a nozzle that is not identical to the original risks off‑ratio combustion and poor heat transfer. When sourcing a replacement, the only reliable method is to read the markings on the existing nozzle or consult the burner manual, not assume compatibility based on GPH alone.