Fuel injector nozzle assembly with improved needle check valve stop mechanism

摘要: In some fuel injectors having VOP (valve opening pressure) type needle checks, the check return spring cavity also functions as a portion of supply passage. A is compressed within between an end wall and one check. Instead utilizing pin stop to limit movement in prior art, present invention utilizes shoulder surface which comes into contact with when valve fully open. This elimination art believed eliminate or reduce cavitation damage spring, chipping problems, beat problems due cocking tipping cavity, other wear functionality caused by free floating stop.