Pressure relief valve and metering unit arrangement for high-pressure fuel pump of fuel injection system of diesel engine, has metering unit and pressure relief valve combined together to form modular unit that comprises valve housing

摘要

The arrangement has a fuel low pressure pump (2) connected with a cam chamber (5) of a high-pressure fuel pump (1), a metering unit (9) and a pressure relief valve (8). The metering unit and the pressure relief valve are combined with each other to form a modular unit (10), which comprises a common valve housing for the metering unit and the pressure relief valve. A throttle is associated with the pressure relief valve, and redirection cross-sectional areas (16a, 16b) comprise a rectangular geometry or trapezoidal geometry.