Hydraulic valve comprising a valve block made in a single piece and provided with cavities to define ducts and openings for the passage of a liquid under pressure, said valve block comprising: - a first side which has a first opening; - a second side which is opposite to said first side; - a third side which is arranged between said first side and said second side and which has a second opening and a third opening; - a fourth side which is opposite to said third side and which has a fourth opening; - a fifth side which is opposite to said third side and which is arranged so that a distance of said fifth side from said third side is greater than a distance of said fourth side from said third side; - a sixth side which is opposite to said first side and is arranged between said fourth side and said fifth side; - two further sides opposite each other and between which said first, second, third, fourth, fifth and sixth sides are arranged; - a first duct which connects said first opening and said second opening to each other; - a second duct which connects said third opening and said fourth opening to each other; - a proximal duct which connects said first duct and said second duct to each other and which is arranged at a distance from said third side which is less than a distance from said fourth side; - a distal duct which connects said first duct and said second duct to each other and which is arranged at a distance from said third side which is greater than a distance between said third side and said proximal duct; characterized in that said distal duct extends with a longitudinal axis that is inclined relative to an orthogonal line between the axis of the first duct and the axis of the second duct, so as to approach said third side proceeding from said first duct to said second duct and in that said distal duct has a passage section which decreases proceeding from said first duct to said second duct, whereby, considering passage sections taken on planes of cross-section parallel to said first side, at least one passage section closer to said first duct, or more distant from said second duct, has a greater area than at least one passage section more distant from said first duct, or closer to said second duct. - a first side which has a first opening; - a second side which is opposite to said first side; - a third side which is arranged between said first side and said second side and which has a second opening and a third opening; - a fourth side which is opposite to said third side and which has a fourth opening; - a fifth side which is opposite to said third side and which is arranged so that a distance of said fifth side from said third side is greater than a distance of said fourth side from said third side; - a sixth side which is opposite to said first side and is arranged between said fourth side and said fifth side; - two further sides opposite each other and between which said first, second, third, fourth, fifth and sixth sides are arranged; - a first duct which connects said first opening and said second opening to each other; - a second duct which connects said third opening and said fourth opening to each other; - a proximal duct which connects said first duct and said second duct to each other and which is arranged at a distance from said third side which is less than a distance from said fourth side; - a distal duct which connects said first duct and said second duct to each other and which is arranged at a distance from said third side which is greater than a distance between said third side and said proximal duct;