Fuel injector for diesel engine has fuel return line coupled to injection jet provided with high pressure region coupled to low pressure region via venting valve

摘要

The fuel injector has a control valve (8) with a control piston (9) switched between 2 end positions and a fuel injection jet (2) with a spring-loaded jet needle (3), coupled to a high pressure fuel feed line and a fuel return line (18) via the control valve. The fuel return line has a high pressure region (22), communicating with a low pressure region (19) via a venting valve.