Saturation-proof hydraulic control device that is composed...

Details Saturation-proof hydraulic control device that is composed... Saturation-proof hydraulic control device that is composed...

2007-05-22

2007-05-22

Lazo, Thomas E. (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

C091S518000

Reexamination Certificate

active

11156702

ABSTRACT:
The invention refers to the field of hydraulic control devices and refers to a saturation-proof hydraulic control device with two or more elements; each element is composed of a six-way, two-position spool (4) of the proportional type, a pressure compensator (3), also of the proportional type, notches on the spool for a correct operation and pressure selector members (MS) equipped with spring (M7) that connect the various elements so that the work function at higher pressure sends the pressure to the spring side of its own pressure compensator (3), making it operate as check valve, and sending the pressure existing between spool (4) and pressure compensator (3) to the spring side of the compensators (3) of the other elements and to the pump (P). The spring (M7) must generate a minimum load that is slightly greater than the pressure drop of the maximum flow-rate through the local pressure compensator (3).

REFERENCES:
patent: 3976097 (1976-08-01), Brakel
patent: 4719753 (1988-01-01), Kropp
patent: 4986071 (1991-01-01), Voss et al.
patent: 5715865 (1998-02-01), Wilke
patent: 5806312 (1998-09-01), Kauss
patent: 5890362 (1999-04-01), Wilke
patent: 6895852 (2005-05-01), Pieper
patent: 2003/0121256 (2003-07-01), Mather
patent: WO 98/13604 (1998-04-01), None

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