A portable control device (10) for regulating a continuous oxygen flow to a user from an oxygen source (50), comprising an inlet (11) to which the oxygen source may be fluidly connected, an outlet (12) to which a breathing device (40) may be fluidly connected, a valve arrangement (20) fluidly connected to said inlet and to said outlet, said valve arrangement being adjustable between a maximum flow state corresponding to a maximum continuous flow of oxygen (F max ), and a minimum flow state corresponding to a minimum continuous flow of oxygen (F min ), and an actuator (13) movable between a maximum and a minimum position and being mechanically connected to the valve arrangement so that when said actuator is in the maximum position said valve arrangement is in the maximum flow state and when said actuator is in said minimum position said valve arrangement is in said minimum flow state.
