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A reagent injector with a cartridge design has a body with a reagent inlet, outlet, and a swirl chamber, which has an exit orifice that may be covered and uncovered by a solid, movable pintle. Reagent flows through the injector when the exit orifice is covered and uncovered to cool the injector. An

A reagent injector with a cartridge design has a body with a reagent inlet, outlet, and a swirl chamber, which has an exit orifice that may be covered and uncovered by a solid, movable pintle. Reagent flows through the injector when the exit orifice is covered and uncovered to cool the injector. An insulator may be disposed between the injector body and a mounting flange connectable to an exhaust system. A flow path ensures cooling of an electromagnetic actuator. Reagent may bypass an orifice swirl chamber when the pintle blocks the exit orifice. Fluid may flow between an outside diameter of a pole piece and an inside diameter of an electromagnetic actuator, through an orifice chamber and return through a central bore housing a solid pintle, around which fluid may flow. Different inner injector body passages may direct fluid into an orifice distribution chamber and out to the solid pintle.

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1. A method of directing reagent through an injector, the method comprising: receiving a reagent at a reagent inlet;directing the reagent to a pole piece passage defined between an outside diameter of a pole piece and an inside diameter of a bobbin;directing the reagent from the pole piece passage t

1. A method of directing reagent through an injector, the method comprising: receiving a reagent at a reagent inlet;directing the reagent to a pole piece passage defined between an outside diameter of a pole piece and an inside diameter of a bobbin;directing the reagent from the pole piece passage to a collar passage defined between an outside diameter of a collar of an inner lower body and the inside diameter of the bobbin, the outside diameter of the pole piece being received within a volume of the collar of the inner lower body such that the collar circumferentially surrounds the outside diameter of the pole piece;directing the reagent from the collar passage to a lower body passage defined between an outside diameter of the inner lower body and an inside diameter of a lower section of the injector;directing the reagent into a distribution passage formed as a bore extending through the inner lower body, the distribution passage fluidly linking the lower body passage to a distribution chamber defined by the inner lower body and an orifice plate;directing a first partial volume of the reagent to an orifice in the orifice plate; anddirecting a second partial volume of the reagent to a reagent outlet. 2. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a first partial volume of the reagent to an orifice in the orifice plate further comprises: directing the first partial volume of the reagent through a plurality of slots in the orifice plate. 3. The method of directing reagent through an injector according to claim 1, wherein directing a first partial volume of the reagent to an orifice in the orifice plate further comprises: moving a pintle and unblocking the orifice in the orifice plate; anddirecting the first partial volume of the reagent through a plurality of slots in the orifice plate and through the orifice. 4. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a first partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent to a central bore defined by the inner lower body. 5. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent through through holes defined in a guide plate through which a pintle passes. 6. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent through through holes of a pintle head, the pintle head attaching to and surrounding an end of a pintle. 7. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent through an interior of a bobbin of a magnetic coil. 8. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent through a central bore of a pole piece. 9. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent from the distribution chamber to at least one return passage defined by the inner lower body, wherein the return passage fluidly links the distribution chamber and a central bore defined by the inner lower body. 10. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent around an outside diameter of a solid pintle residing within a central bore defined by the inner lower body. 11. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a first partial volume of the reagent to an orifice in the orifice plate further comprises: directing the first partial volume of the reagent through a plurality of slots defined in an orifice plate holder. 12. The method of directing reagent through an atomizing injector according to claim 11, wherein the orifice plate holder and orifice plate are physically separate pieces. 13. The method of directing reagent through an atomizing injector according to claim 1, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent from the distribution chamber to at least one return passage defined by an orifice plate holder, wherein the return passage fluidly links the distribution chamber and a central bore defined by the inner lower body. 14. A method of directing reagent through an injector, the method comprising: pumping a reagent from a reagent tank to an injector reagent inlet;directing the reagent to a pole piece passage defined between an outside diameter of a pole piece and an inside diameter of an upper section of the injector;directing the reagent from the pole piece passage to a bobbin passage located between an outside diameter of the pole piece and an inside diameter of an electromagnetic coil bobbin;directing the reagent from the pole piece passage to a collar passage located between an outside diameter of a collar of an inner lower body and an inside diameter of the electromagnetic coil bobbin, the outside diameter of the pole piece being received within a volume of the collar of the inner lower body such that the collar circumferentially surrounds the outside diameter of the pole piece;directing the reagent from the collar passage to a lower body passage located between an outside diameter of the inner lower body and an inside diameter of a lower section of the injector;directing the reagent into a distribution passage formed as a bore extending through the inner lower body, the distribution passage fluidly linking the lower body passage and a distribution chamber defined by the inner lower body and an orifice plate;dividing the reagent into a first partial volume and a second partial volume;directing the first partial volume and second partial volume of the reagent into the distribution chamber;directing the first partial volume into curved slots defined in the orifice plate;lifting a pintle from the orifice plate, the pintle extending through a central bore formed in the inner lower body, the pintle have a pintle head being disposed with the volume of the collar of the inner lower body; anddirecting the first partial volume of the reagent around an orifice in the orifice plate. 15. The method of directing reagent through an injector according to claim 14, the method further comprising: directing the first partial volume of the reagent from around the orifice in the orifice plate and into an exhaust tube. 16. The method of directing reagent through an injector according to claim 14, the method further comprising: directing the second partial volume of the reagent to a reagent outlet. 17. The method of directing reagent through an injector according to claim 16, the method further comprising: directing the second partial volume of the reagent from the reagent outlet and to the reagent tank. 18. The method of directing reagent through an injector according to claim 16, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent to a return passage defined in the inner lower body, the return passage directing the second partial volume from the distribution chamber to the central bore defined by the inner lower body. 19. The method of directing reagent through an atomizing injector according to claim 16, wherein directing the second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume around an outside diameter of the pintle residing within the central bore. 20. The method of directing reagent through an atomizing injector according to claim 16, wherein directing the second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent through through holes of a guide plate through which the pintle passes; anddirecting the second partial volume of the reagent through through holes of the pintle head to which the pintle is attached. 21. The method of directing reagent through an atomizing injector according to claim 16, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent through the inside diameter of the ectromagnetic coil bobbin. 22. The method of directing reagent through an atomizing injector according to claim 16, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing the second partial volume of the reagent through a central bore of a pole piece, wherein the pole piece is located through inside diameter of the electromagnetic coil bobbin. 23. The method of directing reagent through an atomizing injector according to claim 16, wherein directing a second partial volume of the reagent to a reagent outlet further comprises: directing a partial volume of the reagent through a spring residing within a central bore of a pole piece.