Abstract: A plunger valve nozzle for mounting vertically in an engine cylinder head between two closely spaced vertical poppet valves in said head, said nozzle having a small diameter body at its lower end, said body having a bore extending vertically therethrough, a plunger valve slidably fitting said bore, a plunger valve retracting rod extending above and connected at its lower end to said plunger valve, a coil spring connected to the upper end of said rod, and an elongated annular housing supporting said body and spring, said housing having a tubular like lower portion enclosing said rod and a larger diameter upper portion enclosing said spring the outside diameter of said lower housing portion being substantially the same as that of said body.

Abstract: A plunger valve nozzle has a nozzle body with a constant diameter bore extending therethrough, one end of which is open to receive fluid under pressure and has a hollow plunger extending thereinto with a direct acting piston portion slidably fitting the bore and exposed to the fluid pressure through the open end of the bore, there being orifices connecting the interior of the plunger to the periphery of the piston portion which are uncovered by the bore when the fluid pressure is sufficient to move the plunger further inwardly of the bore a predetermined distance, which movement is opposed by a spring connected to the plunger and reacting against the nozzle body.

Abstract: An orifice plunger valve fuel injector is provided with a nozzle body having a bore extending from one end thereof, a plunger valve being slidably mounted and closely fitted within the bore of the nozzle body, the end of the plunger valve adjacent said one end of said nozzle body being provided with radially extending spray tip holes therein which are supplied with pressurized fuel through an axial passage in the plunger valve in communication at one end with the spray tip holes and at its other end, intermediate the ends of the plunger valve, with at least one radial passage in communication with an inlet fuel passage means in the nozzle body supplied with fuel under pressure through a one-way valve from a source of fuel under pressure, a retractor spring being positioned in the nozzle body and operatively connected with the plunger valve to normally bias the plunger valve into a retracted position within the bore of the nozzle body whereby the spray tip holes are closed off by the bore wall of the nozzle bo