hp-Technik NVBGRGZ-D-4-20-BH1 oil pump

This oil pump from hp-Technik is a component designed for oil burners. Parts of this type draw fuel from the tank and deliver it to the nozzle at the pressure that determines the firing rate. An integral solenoid valve provides the sharp fuel cut-off that the burner control demands for clean shutdown. In the system, the oil pump works together with the nozzle, the filter, and, if fitted, a preheater for heavier oils. The burner control energises the pump solenoid to admit fuel during the ignition sequence and de-energises it to stop the flame. When selecting a replacement oil pump, the key parameters are rotation direction (clockwise or counter-clockwise viewed from the shaft end), single-pipe or two-pipe operation, capacity rating and pressure range, shaft diameter and mounting pattern, and the thread sizes of inlet, outlet, and return connections. Some pumps include an integrated filter; others require a separate line filter upstream. Preheaters are separate add-on modules for applications with viscous oil. Common failure modes include worn gears causing loss of pressure, a failing pressure regulator that produces unstable output, a leaking shaft seal that lets air into the system, or a solenoid coil that fails, preventing the burner from cutting off reliably. Regular inspection of the pump’s suction line for leaks and the filter for blockage helps avoid premature wear. This specific article carries the manufacturer code NVBGRGZ-D-4-20-BH1 and the catalogue number 543.526.027 from hp-Technik. It is listed under oil pumps in the catalogue.