Abstract: A check and flow metering cartridge valve having two flow restriction zones, each zone being disposed adjacent a respective end of a valve chamber containing a check valve member, the zones being serially encountered by flow through the valve, the restriction of the restriction zones together being a majority of the total flow restriction in the valve, each restriction zone producing at least 26% of a total restriction to flow through the valve, the restriction zones maintaining back pressure in the valve chamber when the check valve member is unseated thereby providing damping of the check valve member.

Abstract: In an electronically operated fuel control valve for a diesel engine, a poppet valve with a stem having a guide surface length portion in a guide bore exposed to a large axial fuel pressure gradient during a fuel injection event, the radial space between the guide surface length portion and the bore being different proximal to a head of the poppet valve than the radial space between such elements distal from the head.

Abstract: A stator assembly for a fuel valve comprising a magnetic E-core of stacked E-shaped laminations, a plastic bobbin proportioned to surround a central leg of the core, a magnetic wire coil on the bobbin, a non-magnetic metal plate having an O-shaped profile adjacent an end of the bobbin and distal ends of central and outer legs of the E-core, the core, bobbin, coil and plate encapsulated in a block, the block having a pair of vent channels overlying portions of the plate disposed between the outer core legs and the central core leg, the plate being proportioned to pre-stress the outer core legs outwardly prior to encapsulation whereby cyclic strain on the block due to hydraulic forces imposed by high pressure fuel pulses tending to spread the outer core legs is reduced and resistance of the block to cracking due to said fuel pressure pulses is increased.

Abstract: A stator assembly for a fuel valve comprising a magnetic E-core of stacked E-shaped laminations, a plastic bobbin proportioned to surround a central leg of the core, a magnetic wire coil on the bobbin, a non-magnetic metal plate having an O-shaped profile adjacent an end of the bobbin and distal ends of central and outer legs of the E-core, the core, bobbin, coil and plate encapsulated in a block, the block having a pair of vent channels overlying portions of the plate disposed between the outer core legs and the central core leg, the plate being proportioned to pre-stress the outer core legs outwardly prior to encapsulation whereby cyclic strain on the block due to hydraulic forces imposed by high pressure fuel pulses tending to spread the outer core legs is reduced and resistance of the block to cracking due to said fuel pressure pulses is increased.

Abstract: A poppet valve for controlling fuel in an electronically actuated valve assembly for diesel engine fuel injection systems comprising along a common axis a stem with a cylindrical guide and a neck, and a circular head, the neck being smaller in cross section than the guide, and the head being larger than the guide, the head having a conical surface facing the guide, the conical surface having an annular primary sealing area and a receding surface area radially outward of the primary sealing area, the primary sealing area having an inside diameter less than a diameter of the guide, an outside diameter greater than the guide and oriented obtusely to the axis, the receding surface area merging with the primary sealing area at an outside diameter of the primary sealing area, the receding surface area being oriented more obtusely to the axis than the orientation of the primary sealing area.

Abstract: An electronic unit injector for a diesel engine that has a check valve for maintaining a pressure greater than vapor pressure and being located as close as practical to a plunger chamber to minimize fluid hammer effects on the check valve and has a fuel capture volume below the check valve that is proportioned to store sufficient static energy in compression of the captured fuel to reclose the check valve if opened by fluid hammer action.

Abstract: An electronic unit injector comprising a spray tip including a valve seat, a needle valve arranged to close on the seat to prevent discharge of fuel from the spray tip or to open off the seat to dispense fuel from the spray tip, a spring biasing the needle valve to a closed position, a spring seat between the spring and the needle valve, the needle valve overcoming the biasing force when the pressure reaches a predetermined level, the spring and seat being disposed in a cage having port areas circumferentially arranged about said spring and spring seat to supply low pressure fuel to the area occupied by said spring and spring seat to reduce the risk of cavitation in said spring cage.

Abstract: An electronic unit injector comprising a spray tip including a valve seat, a needle valve arranged to close on the seat to prevent discharge of fuel from the spray tip or to open off the seat to dispense fuel from the spray tip, a spring biasing the needle valve to a closed position, a spring seat between the spring and the needle valve, the needle valve overcoming the biasing force when the pressure reaches a predetermined level, the spring and seat being disposed in a cage having port areas circumferentially arranged about said spring and spring seat to supply low pressure fuel to the area occupied by said spring and spring seat to reduce the risk of cavitation in said spring cage.