Steinen 1.00GPH, 80S nozzle

An oil nozzle is a precision consumable part that atomises fuel oil into a fine spray cone so it can mix with air and burn completely. It is mounted at the end of the blast tube inside the combustion head, immediately downstream of the oil pump and solenoid valve. In a typical oil-fired burner, the pump delivers fuel at a set pressure to the nozzle; the nozzle’s internal swirl chamber and orifice create a rotating film that breaks into droplets as it leaves the opening. The shape and direction of the spray are defined by the nozzle’s three key parameters: flow rate (given in USGPH or kg/h at a reference pressure, usually 100 psi or 7 bar), spray angle (commonly 30° to 80°), and spray pattern (hollow cone, solid cone, or semi-solid). All three must match the burner manufacturer’s specification for the flame to sit correctly in the combustion head. A nozzle with the correct GPH rating but the wrong pattern can cause sooting, pulsation, unstable ignition, or incomplete combustion. Replacement therefore requires verifying the data plate on the burner for the exact nozzle type rather than relying solely on the old part, as markings can be worn. The thread is typically 1/8" BSP or NPT depending on the burner make. Because the nozzle operates under high pressure and at elevated temperature, the orifice can wear or become blocked by debris, so fitting a new nozzle as part of annual service is common practice. The Steinen 1.00GPH, 80S nozzle belongs to this class of oil nozzles and is selected according to the same criteria: flow rate, angle, and pattern must be confirmed against the burner specification.