Directional control valve comprising an internal pressure...

Details Directional control valve comprising an internal pressure... Directional control valve comprising an internal pressure...

2005-03-01

2005-03-01

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Systems

Supply and exhaust

C091S446000, C137S625680

Reexamination Certificate

active

06860291

ABSTRACT:
A directional control valve includes a pressure regulator piston configured as a hollow slide with a radial passage positioned in such a way that a connection from the internal chamber of the pressure regulator piston to a pump pressure annular channel (P) can be regulated by the radial passage and a second radial passage of a directional control valve piston. The second radial passage constitutes a control edge, which is used to regulate the connection from the internal chamber to a load sensing annular channel (LS). An annular groove, which in the neutral position forms a connection from the internal chamber to the load sensing annular channel (LS), is joined to the second radial passage. The pressure regulator is impervious to different flow forces caused by different mass fluxes and ensures that the hydraulic consumer is prevented from moving in the neutral position.

REFERENCES:
patent: 4719753 (1988-01-01), Kropp
patent: 5446979 (1995-09-01), Sugiyama et al.
patent: 6516614 (2003-02-01), Knoll
patent: 198 36 564 (2000-02-01), None

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