PRESSURE RELIEF VALVE COMPRISING A PISTON HAVING A VARIABLE CROSS-SECTION OF A HIGH-PRESSURE ACCUMULATOR FOR AN INJECTION SYSTEM

摘要

The invention relates to a pressure relief valve for a high-pressure accumulator of the fuel injection system of an internal combustion engine, comprising: a body having a pressure control passage comprising a piston (300) acted on by a rated spring, wherein the piston to the fuel tank opens when the pressure in the accumulator exceeds the target pressure. The piston (300) consists of a circular cylindrical front part (321), a truncated cone-shaped intermediate part (322) and a circular cylindrical back part (323). The smaller base of the intermediate part is directed forward, and the back part has a circular cross-section corresponding to the pressure control passage borehole.