UNIT FUEL INJECTOR HAVING CHECK VALVE BODY AND SPRING CAGE FORMING A REVERSE FLOW CHECK CAVITY

摘要

A proximal end face of a proximal end wall (82) of a spring cage (42) in a unit fuel injector (30) and a distal end face of a check valve body (44) cooperatively define a reverse flow check cavity (124) within which a reverse flow check (122) is disposed for selectively opening and substantially closing an exit through-passage (112) in the check valve body (44). The reverse flow check opens the exit through-passage during high-pressure injection and substantially closes the exit through-passage when injection ceases.