صمام تجاوز الزيت hp-Technik B-P-E/4

The hp-Technik B-P-E/4 is a bypass oil valve, catalogue number 543.322.024 under manufacturer code B-P-E/4. Parts of this type are installed in the oil circuit of pressure-jet burners, typically between the oil pump and the return line. Their function is to divert excess oil flow back to the tank or pump inlet when the burner is not firing, maintaining a stable circulating pressure and preventing the pump from dead-heading. In two-pipe systems, this valve is essential to allow the pump to run without the nozzle open, as during pre-purge or post-purge cycles. When selecting a bypass oil valve, engineers match it to the pump’s capacity and the system’s pipework—single-pipe or two-pipe layout. The valve’s opening pressure must align with the pump’s working pressure range, and its port connections must fit the existing threads. On replacement, check that the valve’s internal spring setting is appropriate for the burner model; an incorrectly set bypass can cause erratic firing or poor cut-off. Typical failures include a stuck plunger from debris or a weakened spring that drifts pressure, leading to nozzle drip on shutdown. The valve itself has no electrical connection; it is a purely hydraulic component that reacts to pump discharge pressure.