Swirl seat nozzle

An injector, comprising:

• a valve seat including a body having an upper surface, a lower surface, and a needle opening formed into the upper surface, the needle opening having at least one liquid passage and a needle bore sized to permit movement of a valve needle between a lowered position, wherein a lower end of the valve needle forms a seal with a seating surface in valve seat to prevent liquid from flowing out of the at least one liquid passage, and a raised position, wherein the lower end of the valve needle is spaced apart from the seating surface to permit liquid to flow out of the at least one liquid passage;
• and
• a nozzle plate including a body having an upper surface, a lower surface, and a metering orifice extending between the nozzle body upper surface and the nozzle body lower surface;
• wherein the valve seat body includes a plurality of drillings that extend at an angle relative to a longitudinal axis extending through the valve seat and the nozzle plate, the plurality of drillings having openings formed in the seating surface and being in flow communication with inlet portions of a plurality of swirl channels, the plurality of swirl channels being configured to deliver fluid from the plurality of drillings to a central swirl chamber in flow communication with the metering orifice, which delivers the fluid from the injector in the form of a spray.