| 摘要 |
Invention relates to a safety valve arrangement (22) for a common rail fuel injection system of an internal combustion engine (10) comprising a pressure accumulator system having a working volume and at least one fuel injector in connection thereto, which safety valve arrangement comprises a body (26) having a space (28) with an inlet (30) at its first end and an outlet (32) arranged to a wall of the body, and a piston unit (34) arranged into the space in a spring loaded manner urging the piston unit towards the inlet, and in which the inlet is arranged to be connected to the working volume (16') of the pressure accumulator system and the outlet is arranged to be connected to a low pressure fuel system (24) of the engine, and in which arrangement the piston unit is arranged to move in the space between a first position at which the piston unit closes the inlet (30) and a second position at which the piston unit opens the outlet (32). An annular cross sectional area is formed by the outer periphery of the piston unit (34) and the inner surface of the space (28), which annular cross section is equal or greater than the cross sectional area of the inlet (30) at least when the piston unit is at its said second position. |
