hp-Technik NVBGRM-D-4-20 oil pump

This oil pump is a component of the oil supply line in a pressure-jet burner. It draws fuel from the tank and delivers it to the nozzle at a controlled pressure that determines the firing rate. An integral solenoid valve provides the sharp cut-off required by the burner control, ensuring that no after-drip occurs when the burner shuts down. Parts of this type are selected based on rotation direction (clockwise or counter-clockwise as viewed on the shaft), single-pipe or two-pipe operation (the latter returns surplus oil to the tank), capacity and pressure range, shaft dimensions and mounting pattern, and connection thread sizes. In applications using heavier oil grades, a preheater may be integrated to reduce viscosity for proper atomisation; a filter is typically fitted on the inlet side to protect the pump and nozzle from dirt. When replacing a pump of this class, common failure modes to verify before condemning the pump include worn gears that reduce delivery, a failing pressure regulation stage that causes unstable flame, a leaking shaft seal that draws air or leaks oil, and a solenoid coil that fails open, leaving the burner unable to cut off fuel cleanly. Always confirm the shaft rotation and pipe configuration of the existing installation to ensure the replacement matches the hydraulic circuit.