hp-Technik PON4-I-R-4-25 oil pump

An oil pump of this type is the component that draws fuel oil from the storage tank and delivers it under pressure to the nozzle in an oil burner. The delivery pressure determines the firing rate, and the pump’s integral solenoid valve provides the sharp cut‑off that the burner control requires for clean shutdown. In the fuel train the pump sits between the filter (or preheater on heavy oil) and the nozzle; the solenoid is wired directly to the burner control. The pump may also include a pressure regulator that bypasses excess oil back to the inlet or to the tank, depending on whether the system is arranged for single‑pipe or two‑pipe operation. When selecting a replacement pump of this class the engineer must confirm the rotation direction (clockwise or counter‑clockwise viewed on the shaft end), the connection thread sizes, the shaft type and mounting flange pattern. The pump’s rated capacity and working pressure range must match the burner’s output and the nozzle specification. Many oil pumps also offer an integrated preheater for heavy oil grades; a filter is essential to protect the pump gears and the nozzle from debris. Typical failure modes include worn gears that reduce pressure, a leaking shaft seal that causes external oil drips, a failing pressure regulator that lets pressure drift, and a stuck or burnt solenoid coil that leaves the burner unable to close the fuel line cleanly and may lead to post‑ignition dripping. The catalogue article 543.520.008 (manufacturer codes 4130612 and 543.520.008) is an hp‑Technik model PON4‑I‑R‑4‑25 oil pump. No further specifications for this particular unit are contained in the source data. Before ordering, verify the rotation direction, pipe configuration, capacity and pressure rating, shaft and mounting pattern, and thread connections against the original pump and the burner manufacturer’s requirements.