Patent ID: 8172161

Claim:
A valve body comprising a cartridge with a recess that forms an injection nozzle on one end and a needle that is arranged in the recess and closes the injection nozzle if a seat area of the needle rests on a needle seat of the cartridge, wherein an area of the cartridge adjacent to the needle seat has an inner diameter contour and a cylindrically-shaped outer diameter contour, and the needle has a cylindrically-shaped area adjacent to the seat area, wherein the cylindrically-shaped outer diameter contour of the cartridge adjacent to the needle seat and the cylindrically-shaped area of the needle have the same outer diameter, wherein a cross-section the inner diameter contour of the cartridge adjacent the needle seat is curved such that an inner diameter of the cartridge gradually increases in a downstream direction, wherein a cross-section an outer diameter contour of the needle upstream of the cylindrically-shaped area of the needle is curved such that an outer diameter of the cartridge gradually increases in the downstream direction, and wherein in a closed position, the seat area of the needle rests directly on the needle seat of the cartridge.