The invention relates to an improved hitch valve for hydraulic system of agricultural tractors, the hitch valve comprising a plurality of first valve element and second valve element housed in a common or individual housings with oil feed passages to direct hydraulic oil into a single acting ram cylinder which lifting an implement of the agricultural tractor, the implement upon retraction of the ram cylinder lowered by self-weight, the first valve element constituting an unloading valve having at least a body, a bush, a spool assembly, a compression spring, a valve seat, a spring seat, and at least two covers, the second valve (CV) element constituting a control valve comprising a valve body having an undercut and accommodating a bush, at least two covers, the bush having at least one each pressure port and return port for hydraulic oil, both the valve elements are connected through a set of mechanical linkages, the improvement is characterized in that the spool assembly of the first vaive element (UV) is constructed with at least three separate members, a first member (6B) in the form of a spool with a flat bottom socket constructed of a hardened and ground member (6A), and a third member (6c) in the form of a hardened and ground ball (6) sitting within an internal conical surface of the valve seat (5) with an included angle of 60°, the valve seat of the spool and having an undercut corresponding to that of the bush and fitted with an "O" Ring seal (4) positioned close to the first cover (1) allowing a radial play； the length of sliding segment of the spool is increased with a clearance in the middle to reduce spool jamming by attaining a ratio of contact length to diameter upto 1.5, and a second "O" Ring seal (9) having identical size of the first "O"Ring seal (4) is provided between a spring seat (8) inserted through the bush bore (2) to the second cover (10)； and a pattern of holes in the return segment (R) of the bush (2) is configured to have a first row of tw
