The invention concerns a device comprising a regulating valve (6) and a safety valve (7) connected in series in a fluid channel of the body of the device (1). A regulating valve (14) is driven by a mobile magnetic core (18) with a longitudinal displacement capacity by the sliding of an axial tube (24) in an axial housing (26) of an axial core (16) integral with the regulating valve (14). A safety valve (8) is connected to a blind axial tube (9) wherein slides the mobile magnetic core (18). The blind axial tube (9) slides in the tube of a field coil (20), and the mobile magnetic core (18) is located opposite a driving magnetic core (19) biased by a linear actuator (21). The powering of the field coil (20) couples the magnetic cores (18, 19) to move the valves through the linear actuator (21). The interruption of the power supply to the field coil (20) disconnects the magnetic cores (18, 19), and the valves (8, 14) are closed independently of each other under the action of return springs (13, 17).