Liquid control valve assembly with local damping and hydraulical

Details Liquid control valve assembly with local damping and hydraulical Liquid control valve assembly with local damping and hydraulical

1999-08-23

2000-11-14

Kaufman, Joseph A.

Valves and valve actuation

Fluid actuated or retarded

Dashpot or fluid controlled retarder or timer

251 51, 251 54, F16K 3100

Patent

active

061458058

ABSTRACT:
A hydraulically actuated fuel injector comprises a valve body and a stepped valve member. The valve body has a wide bore portion and a narrow bore portion. The stepped valve member has a wide member section and a narrow member section. The wide member section is slidably disposed in the wide bore portion and defines a first diametrical clearance therebetween. The narrow member section and the wide bore portion define a damping chamber therebetween that is wider than the first diametrical clearance. The stepped valve member is slidable between a first position at which the damping chamber is substantially fluidly open to a low pressure hydraulic fluid reservoir, and a second position at which a fractional portion of the narrow member section is slidably disposed within a portion of the narrow bore portion defining a second diametrical clearance therebetween that is less wide than the damping chamber and substantially restricts fluid communication between the damping chamber and the reservoir.

REFERENCES:
patent: 4462426 (1984-07-01), Rexer
patent: 4552172 (1985-11-01), Krieger et al.
patent: 4583567 (1986-04-01), Arav
patent: 5048790 (1991-09-01), Wells
patent: 5288025 (1994-02-01), Cerny
patent: 5839661 (1998-11-01), Iwanaga

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