Valve seat assembly for fuel injector

摘要

A solenoid actuated fuel injector (10) includes a valve body (14) having a longitudinal axis (A). A valve seat subassembly (20) is mounted in one end (22) of the valve body. The valve seat subassembly (20) includes a valve seat (24) having a seating surface (26) and a circumferential sealing surface (27) surrounding the seating surface. The valve seat subassembly also includes a lower needle guide (44) and swirl disk (50) laser welded to the valve seat. The subassembly includes a radially extending flange (47) that axially positions the subassembly in the nose of the injector and eliminates the tolerances associated with the stack up height of conventional valve seat subassembly components.