High pressure pump for fuel injection device in internal combustion engine having valve which when open releases first, then second through-flow cross sections in flow direction and lastly third cross-section larger than preceding two

摘要

Pump has pump element having a piston driven in a lifting motion which demarcates pump's working space into which fuel is sucked via an inlet valve and forced out of an outlet valve (32) into a high pressure area. Inlet and/or outlet valves have a roughly conical valve member (40) which works with the sealing surface of valve seat (43b). Valve member when open releases a first through-flow cross-section (50) and forms a second such cross-section (52) in direction of flow after first. In flow direction between first and second cross-sections a third (54) through-flow cross-section forms which is larger than the other two.