hp-Technik spring stage 3+4

This entry is a spring stage 3+4 from hp-Technik, listed under the oil filters, coils, tubes & hoses category. The catalogue article is 543.625.001, also referenced as 0840672. Parts of this type serve the fuel delivery, shut-off, and conditioning functions in oil burners. The oil pump draws fuel from the tank and delivers it to the nozzle at the pressure that sets the firing rate. Its integral solenoid valve provides the sharp cut‑off required by the burner control. Preheaters warm heavier oil so it atomises reliably, and filters protect both the pump and the nozzle from contamination. When selecting a component of this class, key parameters include rotation direction (clockwise or counter‑clockwise), single‑ or two‑pipe operation, capacity and pressure range, shaft and mounting pattern, and connection threads.