مضخة الوقود Delta VM4RL2-1/4بوصة"

This is a Delta fuel pump, catalogue article 354.529.005, also referenced under manufacturer code 1124.5050. It is listed under oil pumps in the spare parts catalogue. No further specifications for this specific article are provided beyond its name and identification numbers. An oil pump of this type draws fuel from the tank and delivers it to the nozzle at the pressure that sets the firing rate. The integral solenoid valve gives the sharp cut-off that the burner control demands. In an oil-fired system, the pump works with the nozzle, filter, and often a preheater. The burner control energises the solenoid to admit fuel; on de-energisation the valve closes abruptly, preventing after-drip. Selection of a replacement pump is based on rotation direction, single- or two-pipe operation, capacity and pressure range, shaft and mounting pattern, and connection threads. Where heavier oil is used, a separate preheater may be fitted upstream to ensure proper atomisation. A filter protects the pump and nozzle from contamination. Typical failures in such pumps include worn gears causing loss of pressure, weak pressure regulation, leaking shaft seal, and solenoid coil failure that leaves the burner unable to cut off cleanly. When replacing a pump, verify that the rotation direction matches the application and that the pipe system (one-pipe or two-pipe) is compatible.