Danfoss 071N7173 BFP21 R5 oil pump

Danfoss 071N7173 BFP21R5 oil burner pumps used in small and medium-sized household burners with a fuel consumption of up to 42 l/h.

Danfoss 071N7173 BFP21R5 gear pump technical data:

• Viscosity range (in the suction line): 1.8-12.0 cSt(mm2/s)
• Filter area / cross-section: 11/200 cm2/microns
• Pressure range: 7-20 bar
• Factory settings: 10 ±1 bar
• Max. pressure in the suction/return line: 2 bar
• Shaft rotation speed: 1400-3450 min
• Max. starting torque: 0.12 Nm
• Ambient temperature: -20 to +70 °C
• Storage temperature: -25 to +120 °C
• Fuel temperature: 0 to +70 °C
• Coil protection degree: IP40
• Shaft: EN225

Danfoss BFP21R5 071N7173 oil pump adjustment:

From the suction line, through the filter, the fuel enters the gear mechanism, which increases its pressure. When voltage is applied to the NC valve (normally closed), it opens and fuel is supplied to the nozzle line. Thanks to the diaphragm of the regulator, the pressure is maintained constant and equal to the setting value. In 2-pipe mode, excess fuel is returned to the tank via the return line. In single-tube mode, the return line is closed and the screw is missing. Excess fuel is sent to the bypass line.