Delavan 55X70A Oil Burner Nozzle 0.55 Gph 70 Degree

Product Description

The DELAVAN 55X70A is a hollow-cone oil burner nozzle rated at 0.55 gallons per hour (GPH) with a 70-degree spray angle. It atomizes fuel oil into a wide, even hollow-cone pattern, supporting complete combustion and consistent ignition in residential and light-commercial oil-fired heating equipment. The body is constructed from brass with stainless-steel internal components, providing corrosion resistance and dimensional stability over extended service. The nozzle measures 1.625 inches in length with a 0.75-inch outer diameter and uses 9/16-24 UNEF threads for a standard OEM-compatible fit. Licensed oil burner technicians and HVAC service professionals install this nozzle as part of routine annual maintenance or combustion tune-up service.

This nozzle is suited for oil burners requiring a hollow-cone spray pattern, which promotes open fuel dispersion across the combustion head. The 0.55 GPH flow rate targets lower-firing-rate residential applications such as boilers, furnaces, and water heaters running on No. 1 or No. 2 fuel oil. The 70-degree angle is commonly specified for burners with tighter air-tube geometry where a wider cone improves air-fuel mixing without impinging on chamber walls.

Key Features

• Hollow-cone spray pattern for open, even fuel dispersion across the combustion head
• 0.55 GPH flow rate matched to lower-firing-rate residential heating systems
• 70-degree spray angle for wide fuel distribution in tighter air-tube configurations
• Brass body with stainless-steel internal parts for durability and corrosion resistance
• 9/16-24 UNEF thread standard for OEM-compatible installation
• 1.625-inch length and 0.75-inch OD for direct drop-in fitment in standard nozzle adapters

Compatibility

Designed as an OEM-style replacement nozzle for residential and light-commercial oil-fired burners specifying a 0.55 GPH hollow-cone nozzle with a 70-degree spray angle and 9/16-24 UNEF threads.

Installation Notes

Installation should be performed by a licensed oil burner technician or qualified HVAC professional. Shut down the burner and allow the combustion chamber to cool completely before replacing the nozzle. Use a proper nozzle wrench on the adapter hex to avoid damaging the nozzle body or adapter threads. After installation, verify combustion performance with a flue-gas analyzer to confirm CO2, smoke number, and stack temperature are within equipment specifications before returning the system to service.