Control valve for a fuel injector comprising a pressure...

Details Control valve for a fuel injector comprising a pressure... Control valve for a fuel injector comprising a pressure...

2007-05-15

2007-05-15

Nguyen, Dinh Q. (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

C239S089000, C239S091000, C239S124000, C239S533100, C123S467000, C123S446000, C123S496000

Reexamination Certificate

active

10566247

ABSTRACT:
A servo-valve for a fuel injector equipped with a pressure booster whose working chamber is separated from a differential pressure chamber by a booster piston in which an actuator can connect a control chamber to a first low-pressure return and the differential pressure chamber can be connected to a second low-pressure return or to a return system in which the returns are connected to each other. A first servo-valve piston has a first sealing seat, and a second piston, embodied as a sealing sleeve, is accommodated on the first servo-valve piston and, together with a valve housing, constitutes a second sealing seat. When the pressure in the control chamber is relieved, this second sealing seat is closed with a shorter stroke, sooner than the first sealing seat. When the control chamber is subjected to pressure, the second sealing seat opens only after the first sealing seat is closed.

REFERENCES:
patent: 4219154 (1980-08-01), Luscomb
patent: 6085719 (2000-07-01), Heinz et al.
patent: 6364282 (2002-04-01), Ausman et al.
patent: 6453875 (2002-09-01), Mahr et al.
patent: 6880527 (2005-04-01), Magel
patent: 2004/0025843 (2004-02-01), Magel
patent: 102 18 904 (2002-12-01), None

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