Patent ID: 7503115

Claim:
A method for producing an electromagnetic hydraulic valve, the method comprising: forming a cylindrical valve housing ( 4 ) having an axial bore ( 5 ) with a piston valve ( 6 ) and a compression spring ( 7 ) located therein, the piston valve ( 6 ) being axially movable in the axial bore ( 5 ) of the valve housing ( 4 ) against a restoring force of the compression spring ( 7 ); forming a plurality of annular grooves ( 8 , 9 , 10 ) on a periphery of the valve housing ( 4 ) spaced apart axially from each other; and forming at least one radial opening ( 11 , 12 , 13 ) in each of the plurality of annular grooves which opens into the axial bore ( 5 ) of the valve housing ( 4 ), the radial openings each having a generally quadrangular cross section window; wherein forming the radial openings ( 11 , 12 , 13 ) includes turning the valve housing on a lathe spindle of a turning machine on an axis generally parallel to the axial bore ( 5 ) and engaging a rotating milling head with the valve housing ( 4 ), the milling head including axially spaced cutters having quadrangular cutting geometries for forming the radial openings ( 11 , 12 , 13 ).