Patent ID: 8881709

Claim:
A fuel injector comprising: an injector body defining a high pressure inlet, a nozzle supply passage, a check control chamber, a check control line, a low pressure drain and at least one nozzle outlet; a check speed control device fixedly positioned within the check control chamber and having an upper bowl, a lower bowl and at least one orifice through the lower bowl; a control valve assembly having a valve member configured to selectively allow fluid communication from the upper bowl and check control line to the low pressure drain; and a check needle movable within the injector body between a first position at which the check needle blocks the at least one nozzle outlet and a second position at which the check needle at least partially opens the at least one nozzle outlet, the check needle including at least one opening hydraulic surface exposed to a fluid pressure of the nozzle supply passage and at least one closing hydraulic surface exposed to a fluid pressure of the first check control chamber.