Piston pump e.g. fuel pump for fuel system of internal combustion engine, has fluid space connected to low-pressure region through communicating passages having openings towards non-return valves in fluid space and low-pressure region

摘要

The piston pump (24) has an inlet-side low-pressure region, a piston (46) and a workspace (25) bounded by the piston. The piston is arranged in a fluid space facing away from the workspace. The fluid space is temporarily connected to the low-pressure region through the communicating passages. The communicating passages are provided with openings towards the non-return valves in the fluid space and low-pressure region.