Piston pump for a vehicle brake system

A piston pump for a vehicle brake system, comprising:

• a housing portion;
• a piston that is guided displaceably in the housing portion;
• and
• an inlet valve having a sealing valve seat embodied on the piston and having a spherical valve body, the sealing valve seat being configured as a circular sealing edge against which the spherical valve body provides sealing,
• wherein the piston defines a fluid passage for brake fluid and is configured in two parts, wherein one part of the piston is a piston rod portion oriented toward an eccentric drive, and the second part of the piston is a piston disk portion which forms the circular sealing edge,
• wherein the piston rod portion defines a longitudinally oriented first supply conduit portion of the fluid passage, said first supply conduit portion extending axially along a length of said piston rod portion and having a radial portion extending radially in direct fluid communication outside said piston rod portion,
• wherein the piston disk portion defines a second supply conduit portion of the fluid passage adjoining the first supply conduit portion in a flow direction, said second supply conduit portion extending axially from said first supply conduit and forming said sealing edge at a face of said piston disk portion opposite said first supply conduit, and
• further wherein said piston disk portion overlaps said piston rod portion and a portion of the radial portion of said first supply conduit radially outside said piston rod portion.