An inlet section for use in a hydraulic distributor, comprising: a valve body; a slider, with a first area and a second area having substantially the same size and being located at two opposite ends of said slider, said slider being longitudinally slidable within the valve body between a first position in which it prevents the passage of fluid from a high pressure line to a low pressure line, and a second position in which it enables said passage of fluid, said first area being subjected to the action of a first pressure fed by the high pressure line and acting in a direction such as to push the slider towards the second position, said second area being subjected to a second pressure fed by a line for detecting the highest load pressure required by uses (A1, A2, B1, B2) placed downstream of the distributor, said second pressure acting in the opposite direction to said first pressure and such as to push the slider towards the first position, a main spring active on the second area of the slider in a direction consistent with the action of the second pressure; a control device of the slider comprising a mechanical thrust means selectively active on the slider in a direction consistent with the action of the first pressure on the first area of the slider so as to force the slider in the second position, said mechanical thrust means comprising a third area and a fourth area being located at two opposite ends, said third area facing the first area of the slider and also subject to the first pressure, said control device further comprising a control spring active on the fourth area opposed to the main spring, a spring chamber being defined inside said valve body, in which the fourth area of the mechanical thrust means and an end of the control spring are located, said control device being configurable in a thrust condition, in which the third area acts on the first area of the slider together with the first pressure to force it into the second position thereof, and in a deactivating condition, in which the third area is distanced and retracted from the first area of the slider, characterized in that it comprises a three-way two-position device, acting on the spring chamber to selectively actuate the connection with the low pressure line or with the detection line of the highest load pressure required by the uses (A1, A2, B1, B2). a valve body; a slider, with a first area and a second area having substantially the same size and being located at two opposite ends of said slider, said slider being longitudinally slidable within the valve body between a first position in which it prevents the passage of fluid from a high pressure line to a low pressure line, and a second position in which it enables said passage of fluid, said first area being subjected to the action of a first pressure fed by the high pressure line and acting in a direction such as to push the slider towards the second position, said second area being subjected to a second pressure fed by a line for detecting the highest load pressure required by uses (A1, A2, B1, B2) placed downstream of the distributor, said second pressure acting in the opposite direction to said first pressure and such as to push the slider towards the first position, a main spring active on the second area of the slider in a direction consistent with the action of the second pressure; a control device of the slider comprising a mechanical thrust means selectively active on the slider in a direction consistent with the action of the first pressure on the first area of the slider so as to force the slider in the second position, said mechanical thrust means comprising a third area and a fourth area being located at two opposite ends, said third area facing the first area of the slider and also subject to the first pressure, said control device further comprising a control spring active on the fourth area opposed to the main spring, a spring chamber being defined inside said valve body, in which the fourth area of the mechanical thrust means and an end of the control spring are located, said control device being configurable in a thrust condition, in which the third area acts on the first area of the slider together with the first pressure to force it into the second position thereof, and in a deactivating condition, in which the third area is distanced and retracted from the first area of the slider, characterized in that it comprises a three-way two-position device, acting on the spring chamber to selectively actuate the connection with the low pressure line or with the detection line of the highest load pressure required by the uses (A1, A2, B1, B2).