Fuel injector electromagnetic metering valve

A fuel injector metering valve comprising an electromagnet including a one-piece magnetic core, said core including inner and outer coaxial pole pieces defining a seat therebetween, a coil in said seat coaxial with said pole pieces, said inner pole piece including a portion extending beyond the outer pole piece and said coil, a ring encircling said portion and contacting said outer pole piece, said ring and outer pole piece having an at least substantially common outer diameter, said ring and inner pole piece having surfaces facing away from said coil, said surfaces being in at least substantially coplanar relation, an armature displaceable between a position in engagement with said surfaces and positions spaced therefrom, a stem on said armature in coaxial relation with said pole pieces and displaceable with said armature, closure means on said stem, resilient means on said stem and normally urging said stem in a direction so that said armature is separated from said surfaces, means defining an opening adapted for being obturated by said closure means responsive to the position of said stem, a body defining a cavity coupled to said opening, a rod in said cavity adapted for being displaced by fuel passing into said cavity, a pin, nozzle means supporting said pin on said body in position for engagement by said rod and defining an orifice adapted for being selectively opened and closed by said pin, and a source of fuel, said nozzle means and body defining conduits coupled to said source for the supply of fuel to said opening and orifice from said source.