Patent ID: 6994116

Claim:
A directional control valve for control, in particular load-independent control, of a hydraulic load in terms of direction and speed, comprising a control piston ( 22 ) which is displaceable axially in opposite directions from a central position in a piston bore ( 21 ) of a valve housing ( 20 ), with which pressure medium paths are controlable between a feed chamber ( 27 ), to which pressure medium is feedable from a pressure medium source, a discharge chamber ( 32 , 33 ), via which pressure medium is leadable away to a tank, and two load chambers ( 28 , 29 ), which has first fine control grooves ( 55 ) for opening a connection between a load chamber ( 28 , 29 ) and the feed chamber ( 27 ) under control, and second fine control grooves ( 56 ) for opening a connection between a load chamber ( 28 , 29 ) and the discharge chamber ( 32 , 33 ) under control, and via which, in the central position, there is a restricted relief connection from a load chamber ( 28 , 29 ) to the discharge chamber ( 32 , 33 ), wherein the relief connection exists via a recess ( 60 , 61 , 70 , 71 ) in the control piston ( 22 ), independently of the second fine control grooves ( 56 ), and in event of displacement of the control piston ( 22 ) with the effect of connecting the load chamber ( 28 , 29 ) to the discharge chamber ( 32 , 33 ), the relief connection is interrupted before the second fine control grooves ( 56 ) open a flow cross section, and wherein in event of displacement of the control piston ( 22 ) with effect of connecting a load chamber ( 28 , 29 ) to the feed chamber ( 27 ), the recess ( 60 , 61 ) remains open to the load chamber ( 28 , 29 ), and the recess ( 60 , 61 ) lies in a fluid path serving to feed back a load pressure.