A valve group (10) which housable 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) fitted, axially movable, on the valve body (11) and obturator positioning and movement means (18). The obturator (15) is movable by the obturator positioning and movement means (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 means of a heat exchanger, or sent directly to the filtering device. Moreover, the obturator (15) is movable by the obturator positioning and movement means (18) as a function of the oil pressure values directly to the filtering device, preventing oil access to the heat exchanger.
