Dual self level valve

Details Dual self level valve Dual self level valve

1997-01-29

1998-08-25

Nguyen, Hoang

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91520, 91532, 60424, F15B 1100, F15B 1300

Patent

active

057973105

ABSTRACT:
A self-leveling system controlling a boom (13) and a bucket (15) by double acting cylinders (17, 19). The system includes a self leveling valve assembly (27) including a first valve section (27a) including a flow divider spool (41) whereby flow from the rod end of the boom cylinder (17) is divided, one portion flowing to the head end of the bucket cylinder (19). The valve assembly also includes a second valve section (27b) including a flow dividing spool (61), whereby flow from the head end of the boom cylinder (17) is divided, a portion flowing to the rod end of the bucket cylinder, as the boom (13) is lowered. The self leveling valve assembly (27) includes capability whereby, even when the bucket cylinder (19) is fully extended or fully retracted, it is still possible to operate the boom cylinder (17).

REFERENCES:
patent: 4034649 (1977-07-01), Harvey et al.
patent: 4337959 (1982-07-01), Bettin et al.
patent: 4510849 (1985-04-01), Khramtsov et al.
patent: 4709618 (1987-12-01), Zongker
patent: 4923362 (1990-05-01), Fryk

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