Hydraulic circuit device of hydraulic working machine

Details Hydraulic circuit device of hydraulic working machine Hydraulic circuit device of hydraulic working machine

2002-11-01

2009-02-10

Beach, Thomas A (Department: 3671)

Excavating

Ditcher

Condition responsive

C037S414000, C414S699000, C701S050000

Reexamination Certificate

active

07487609

ABSTRACT:
To permit smooth performance of both of an operation requiring a high pressure and an operation desired to produce a pressure at a suppressed level, a shuttle block positioned between pilot operating units and flow control valves and pump regulators is arranged in association with shuttle valves, which select maximum pressures of groups of operation signal pressures produced by the pilot operating units, respectively, and at least one of the plural groups of operation signals, and is constructed to include hydraulic selector valves and a boom-lowering, hydraulic selector valve that are operable in particular ways.

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