Valve group with elements in shape-memory alloys

摘要

A valve group (10) is housed in a duct (40) of a pressurized oil circuit of a vehicle. The valve group (1) extends along an axis (X-X) including a valve body (11) axially fixed to the conduit (40) and an obturator (15) fitted axially movably, on the valve body (11). The obturator (15) has an exchanger aperture (153) through which oil flows to a heat exchanger (3) in the circuit and an auxiliary aperture (152) through which the oil flows to an auxiliary component of the circuit. The valve group (10) includes a pair of elastically yieldable elements (180) of a material selected from among the shape-memory alloys, operatively connected between the valve body (11) and obturator (15), and suitable, as a function of the oil temperature and/or the oil pressure, to axially move and to maintain the obturator (15) in a predefined axial position.