Low pressure circuit for fuel injection system, particularly common rail injection system, comprises supply pump for supplying fuel from fuel tank by fuel lines of high pressure pump

摘要

The low pressure circuit comprises a supply pump (1) for supplying fuel from a fuel tank (2) by fuel lines (4) of a high pressure pump (3). A fuel filter (5) is arranged between the supply pump and the high-pressure pump. An overflow valve (8) has progressive opening characteristics. An opening cross-section is released with the stroke of an axially displaced valve unit.