Patent ID: 9683472
Date: 2017-06-20
CPC Classifications: F01N,Y02T,Y10T

Claim:
1. An injector for injecting a reagent, the injector comprising: a housing; an axially translatable valve member positioned within the housing; an electromagnet positioned within the housing and including a coil of wire circumscribing at least a portion of the valve member, wherein the valve member moves between a seated position and an unseated position in response to energizing the electromagnet; a flux frame surrounding the coil, the frame including first and second radially extending portions axially spaced apart from one another, extending along substantially parallel planes positioned on opposite sides of the coil; a flux sleeve including two magnetic portions interconnected by a magnetic bridge portion, each of the two magnetic portions being intersected by one of the planes in which the radially extending flux frame portions lie to define flux bridges, the flux bridge portion being surrounded by the coil and axially positioned between the parallel planes; and a tubular pole piece disposed within the housing, wherein the pole piece defines a return passageway for reagent to flow when the valve member is at at least one of the seated position and the unseated position.