Patent ID: 6860291

Claim:
A directional valve with internal pressure regulator, said valve comprising: a valve housing having a longitudinal bore in which a plurality of coaxial annular ducts are recessed, said annular ducts comprising a pump-pressure duct, a load sensing duct, and an annular tank connection duct; a directional valve piston which is axially displaceable in said longitudinal bore, said directional valve having an axial bore with a first radial perforation, a second radial perforation which axially spaced from said first radial perforation, an annular groove adjoining said second radial perforation, and a closed end, said second radial perforation communicating with said pump pressure duct or, via said annular groove in a neutral position of said directional valve piston, with said load sensing duct; a pressure regulator piston which is axially displaceable in said axial bore, said pressure regulator piston having a control edge, a closed end wall, an inner space with an inside diameter, and at least one radial perforation which permanently connects said inner space to said second radial perforation in said directional valve piston; a pressure regulator spring space between said closed end wall of said pressure regulator piston and said closed end of said directional valve piston, said space containing a spring which loads said closed end wall away from said closed end; and means permanently connecting said pressure regulator spring space to said load sensing duct.