Fuel injector with balanced metering servovalve, for an...

Details Fuel injector with balanced metering servovalve, for an... Fuel injector with balanced metering servovalve, for an...

2011-06-07

2011-06-07

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Electrically actuated valve

Including solenoid

C239S585100

Reexamination Certificate

active

07954787

ABSTRACT:
The injector comprises a balanced metering servovalve to control a rod for the opening/closing of a nozzle. La servovalve has a valve body with a control chamber radially delimited by a tubular portion and fitted with an outlet passage that is opened/closed by an axially movable shutter. The servovalve is also integral with an axial stem, provided with a lateral surface, through which the outlet channel exits. The shutter is coupled to the stem in an axially sliding manner and, when it closes the outlet passage, it is subjected to substantially null axial fuel pressure. The outlet passage has a calibrated segment distanced from the shutter and close to a bottom wall of the control chamber. The calibrated segment is carried by an element fixed to the valve body in correspondence to an axial segment of the outlet passage.

REFERENCES:
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patent: 1 612 403 (2004-06-01), None
patent: 1 621 764 (2005-05-01), None
patent: 1 731 752 (2006-05-01), None

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