Flow control apparatus for construction heavy equipment

Details Flow control apparatus for construction heavy equipment Flow control apparatus for construction heavy equipment

2006-03-28

2006-03-28

Look, Edward K. (Department: 3745)

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Single valve for relatively movable working members

C091S445000

Reexamination Certificate

active

07017470

ABSTRACT:
Disclosed is a flow control apparatus for construction heavy equipment capable of maintaining constant set flow rate regardless of changes in load pressure and pump pressure. The flow control apparatus is composed of a control valve, a flow control valve, and a load check valve. The control valve has a parallel passage, a housing provided with a first load passage and a second load passage, and a control spool provided to be movable in the housing. The flow control valve having a logic check valve provided to be openable between the first load passage and the parallel passage, and a logic control valve controlling a flow rate supplied to a back pressure chamber of the logic check valve. The load check valve is provided between the second load passage and the parallel passage to restrict backflow from the second hydraulic cylinder.

REFERENCES:
patent: 2954011 (1960-09-01), Krehbiel
patent: 3313316 (1967-04-01), Thomas
patent: 5006033 (1991-04-01), McConnell
patent: 2003/0115878 (2003-06-01), Joung

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