Method and system for improving stability of hydraulic...

Details Method and system for improving stability of hydraulic... Method and system for improving stability of hydraulic...

2007-08-28

2007-08-28

Kershteyn, Igor (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

To provide unequal inlet and exhaust flow rates to single...

C060S461000

Reexamination Certificate

active

11222583

ABSTRACT:
A hydraulic circuit is disclosed that can include a flow control element, a pressure compensator connected via a pair of load sense lines to an inlet line and an outlet line, respectively, of a flow control element to provide a constant pressure drop across the flow control element, and a load sense line control valve installed in a load sense line to provide controllable resistance in a flow passage in opposite flow directions, the resistance in each flow direction being different. The load sense line control valve can include a restrictive orifice followed by a spring-loaded check valve in a first flow direction and at least one other restrictive orifice and a check valve in a second flow direction, the second flow direction opposing the first flow direction.

REFERENCES:
patent: 4993921 (1991-02-01), Taplin et al.
patent: 5048561 (1991-09-01), Taplin et al.
patent: 5927072 (1999-07-01), Vannette
patent: 6089248 (2000-07-01), Rost
patent: 6260467 (2001-07-01), Mickelson et al.
patent: 6966329 (2005-11-01), Liberfarb
Hydraforce, Inc., Lincolnshire, Illinois, catalog pages of pressure compensator EC42-M43, available prior to Sep. 9, 2005, pp. 5.516.1 and 5.516.2.

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