A valve group suitable to be placed in a duct of a pressurised oil circuit of a vehicle, in which the valve group extends in length along an axis (X-X) and is insertable and removable as a cartridge in said duct, wherein the valve group comprises: i) a valve body of a hollow shape, defining a central cavity, through which the oil flows, wherein the valve body extends in length along the axis (X-X) and is insertable in the duct in a fixed axial position along the axis (X-X), wherein the valve body comprises: - at least one inlet opening, preferably radial, through which the oil enters the central cavity; - at least one axial outlet opening through which the oil is suitable to flow in a direction substantially parallel to the axis (X-X) located at a head end of the valve body; - at least one radial outlet opening through which the oil is suitable to flow in a substantially radial direction to the axis (X-X), towards an outlet duct fluidically connected to the duct; ii) a control device housed in the central cavity comprising: • an obturator element which extends along the axis (X-X) comprising at a head end a closing element, wherein the obturator element is axially movable between an obstruction position in which the closing element cooperates with the valve body closing the axial outlet and an open position in which the closing element is axially spaced from the axial outlet opening; • movement means suitable to move the obturator element axially, comprising a thrust element and a counter-thrust element acting on the obturator element in opposite directions, wherein the thrust element is in a heat-sensitive material varying its thrust action depending on the temperature of the oil; wherein the valve body comprises an anchor element, which extends circumferentially and defines centrally a hole inside which the obturator element is housed; and the valve body presents laterally, parallel to the axis (X-X), at least one insertion window through which the control device is insertable in the valve body in the central cavity. i) a valve body of a hollow shape, defining a central cavity, through which the oil flows, wherein the valve body extends in length along the axis (X-X) and is insertable in the duct in a fixed axial position along the axis (X-X), wherein the valve body comprises: - at least one inlet opening, preferably radial, through which the oil enters the central cavity; - at least one axial outlet opening through which the oil is suitable to flow in a direction substantially parallel to the axis (X-X) located at a head end of the valve body; - at least one radial outlet opening through which the oil is suitable to flow in a substantially radial direction to the axis (X-X), towards an outlet duct fluidically connected to the duct; - at least one inlet opening, preferably radial, through which the oil enters the central cavity; - at least one axial outlet opening through which the oil is suitable to flow in a direction substantially parallel to the axis (X-X) located at a head end of the valve body; - at least one radial outlet opening through which the oil is suitable to flow in a substantially radial direction to the axis (X-X), towards an outlet duct fluidically connected to the duct; ii) a control device housed in the central cavity comprising: • an obturator element which extends along the axis (X-X) comprising at a head end a closing element, wherein the obturator element is axially movable between an obstruction position in which the closing element cooperates with the valve body closing the axial outlet and an open position in which the closing element is axially spaced from the axial outlet opening; • movement means suitable to move the obturator element axially, comprising a thrust element and a counter-thrust element acting on the obturator element in opposite directions, wherein the thrust element is in a heat-sensitive material varying its thrust action depending on the temperature of the oil; • an obturator element which extends along the axis (X-X) comprising at a head end a closing element, wherein the obturator element is axially movable between an obstruction position in which the closing element cooperates with the valve body closing the axial outlet and an open position in which the closing element is axially spaced from the axial outlet opening; • movement means suitable to move the obturator element axially, comprising a thrust element and a counter-thrust element acting on the obturator element in opposite directions, wherein the thrust element is in a heat-sensitive material varying its thrust action depending on the temperature of the oil;