Buoyancy compensator device and related overpressure or relief valve

An overpressure relief valve (30) for a buoyancy compensator device (10) for underwater use of the type comprising an expandable bag (12) internally provided with at least one air chamber, the valve (30) comprising at least one first mobile shutter element (32) configured to occlude at least one corresponding hole (62) formed on an abutment plate (46) that is configured to be applied on a wall of said air chamber, said first mobile shutter element (32) being operatively connected to a first end of a first elastic element (34), whereas a second end of said first elastic element (34) is in turn operatively connected to an actuator element (36), the valve (30) being characterized in that said actuator element (36) is an electric actuator element, actuated by an electrical current and configured to counteract, in certain operating conditions of the valve (30), the elastic force of said first elastic element (34), so as to perform the selective opening and closing of the first mobile shutter element (32) and, consequently, respectively allow or prevent air from said hole (62), and then from the inside of said air chamber, from passing towards one or more through holes (58) formed on the outer body (60) of the valve (30) and vice versa.