hp-Technik B-GH-E/2 bypass oil valve

This is an hp-Technik bypass oil valve, listed under catalogue article 543.322.005 and manufacturer code B-GH-E/2. Parts of this type are installed in the oil circuit between the pump and the nozzle assembly. Their primary function is to regulate the return flow of oil in two-pipe systems, maintaining stable pressure at the nozzle and preventing the pump from deadheading when the solenoid valve closes. Bypass valves also assist in bleeding air from the system during commissioning. When selecting a replacement bypass valve, the key parameters are the connection thread size and type, the pressure regulation range, and whether the valve is designed for single‑pipe or two‑pipe operation. The valve must match the pump’s output capacity and the burner’s required operating pressure. In many burners, the bypass valve is integrated into the pump body, so a separate external valve like this one is typically used only where the pump lacks an internal bypass or where a fine adjustment is needed. During replacement, check the sealing surfaces and the condition of any O‑rings or gaskets. A leaking bypass valve can cause erratic pressure at the nozzle, leading to poor combustion or failure to ignite. Also verify that the valve’s adjustment screw, if present, is set to the pressure specified in the burner manual. Parts of this class are not universal – always confirm thread size and pressure range before installation.