Page 61

NORA Oilheat Technicians Manual

Chapter 4 Fuel Units and Oil Valves Chapter 4 Fuel Units and Oil Valves Figure 4-2: Cutaway of oil valve To Nozzle Chapter 4—Fuel Units and Oil Valves 4-3 Introduction Function of fuel units: These components lift the oil from the tank to the burner, deliver oil at a constant and regulated pressure to the nozzle, and provide clean cutoff of fuel. Component parts of the fuel unit • The fuel unit contains a set of machined gears, which provide both vacuum and pressure. The single stage fuel unit, Figure 4-1, contains one set of fuel pump gears. • The pressure-regulating valve controls the pressure of the oil discharged to the nozzle. A cutaway of this valve is shown in Figure 4-2. This assembly consists of a valve body and matching piston. In the closed position, the piston is held against the nozzle discharge port by a Figure 4-1: Single stage fuel unit No. Description 1 Vacuum Gauge Connection Port 2 Pressure Regulator Adjustment Screw 3 Pressure Gauge Connection Port and Bleeder 4 Pump Cover Screws 5 Return Fuel Line Port 6 By-pass Plug 7 Supply Fuel Line Port 8 Capillary Tube Connection Port 9 Oil Delivery Port 10 Pump Cover O-ring 11 Pump Cover Easy Flow Air Bleed Valve and Gauge Port Check Valve Assy. Special Piston Assy. Special Removeable Sleeve Standard Pressure Adjusting Spring Special


NORA Oilheat Technicians Manual
To see the actual publication please follow the link above