Pressure swirl flow injector with reduced flow variability and return flow

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;
• and
• directing the first partial volume of the reagent around an orifice in the orifice plate.