Oil activated fuel injector control valve

A control valve body for use with a fuel injector, comprising:

• an oil inlet area;
• at least one port in fluid communication with the oil inlet area, the at least one port transporting oil between the oil inlet area and an intensifier chamber of the fuel injector;
• an aperture having at least one communication port positioned about a surface of the aperture, the at least one communication port providing a flow path for the oil between the at least one port and the oil inlet area;
• a spool positioned within the aperture and slideable between a first position and a second position, the spool including at least one communication port which is in alignment with the at least one communication port of the aperture when the spool is in the first position;
• and
• at least one vent port for venting the oil from the control valve body when the spool is in the second position, the at least one vent port being positioned above a level of the oil and preventing air from entering the at least one communication port of the spool.

An oil activated fuel injector, comprising:

• a control valve body, the control body including:
• an inlet area;
• at least one working port in fluid communication with the inlet area;
• at least one communication port positioned between and in fluid communication with the inlet area and the at least one working port;
• a spool having at least one fluid path which is alignable with the at least one communication port;
• at least one vent hole in fluid communication with the at least one working port, the at least one vent hole being positioned above the at least one working port to reduce captured air in the at least one working port;
• an intensifier body mounted to the control valve body, the intensifier body including a centrally located bore and a shoulder;
• a piston slidably positioned within centrally located bore of the intensifier body;
• a plunger contacting the piston, the plunger having a first end, a second end and a shaft;
• an intensifier spring surrounding the shaft of the plunger and further positioned between the piston and the shoulder of the intensifier body, the intensifier spring urging the piston and the plunger in a first position proximate to the valve control body;
• a high pressure fuel chamber formed at the second end of the plunger;
• a nozzle having a fuel bore in fluid communication with the high pressure chamber;
• a needle positioned within the nozzle;
• and
• a fuel chamber surrounding the needle and in fluid communication with the fuel bore.