Patent ID: 7100639
Filing Date: 2006-09-05
Classification: F15B,Y10T

Abstract:
1. A directional valve for controlling the pressure and flow of hydraulic oil to and from a consumer, said valve comprising: first and second working connections for connecting to said consumer; a slide bore having an axis of symmetry; a slide piston movable in said slide bore; a drive for actuating said piston; and a plurality of annular ducts surrounding said slide bore and communicating with said slide bore, said annular ducts comprising: an annular tank connection duct on said axis of symmetry; first and second annular working ducts arranged symmetrically to said axis of symmetry and connected to respective first and second working connections; first and second annular pump pressure ducts arranged symmetrically to said axis of symmetry, outside of said working ducts, and connected to each other by a pump pressure duct connection; first and second annular load sensing ducts arranged symmetrically to said axis of symmetry, outside of said pump pressure ducts, and connected to each other by a load-sensing connecting line; and first and second annular end space ducts arranged symmetrically to said axis of symmetry, outside of said annular load sensing ducts, and connectable to other said annular ducts.