a hydraulic directional valve having an electromagnetic actuating unit and a valve section , an essentially cylindrical , blind hole - like receptacle being formed on one component of the actuating unit , a flange section of a valve housing of the valve section engaging in the receptacle , the flange section being provided with an angular groove which extends in a circumferential direction , and an essentially hollow cylindrical wall of the receptacle in the region of the annular groove engaging in said annular groove in such a way that it bears on the groove base of the annular groove , along the entire circumference of said annular groove . the torsional rigidity between the flange section and the wall is increased . in this context , particular emphasis is placed on processing reliability and economic viability of the connecting process .