A valve group (10) is housed in a duct (40) of a support body (4) of an oil filtering assembly provided with a valve body (11) fixed to the support body (4). An obturator (15) is fitted in an axially movable manner on the valve body (11) and includes an obturator positioner and mover (18). The obturator (15) is movable by the obturator positioner and mover (18) as a function of the oil temperature values respectively in a first, a second and a third operating configuration, in which the oil is cooled, heated, for example by a heat exchanger, or sent directly to the filtering device. Moreover, the obturator (15) is movable by the obturator positioner and mover (18) as a function of the oil pressure values directly to the filtering device, preventing oil access to the heat exchanger.