Control valve for gaseous fluid, intended to be mounted in a gaseous fluid circulation line, said valve comprising a hollow body forming a housing, which is configured to be passed through by an authorized stream of gaseous fluid circulating between an inlet opening and an outlet opening of said housing and in which are mounted a mobile shutter with a shut-off member and elastic means (6, 7) acting on said shutter, said shutter and the elastic means (6, 7) being arranged and configured in such a way that the shutter opens up the inlet opening in the event that an authorized gas stream is present and shuts off said inlet opening in the event that a gas stream that tends to circulate in the opposite direction is present, this being by movement of its shut-off member respectively between a position at a distance from the region of the housing that has said inlet opening and a position close to, or even in contact with, this region, the elastic means (6, 7) consisting of two springs acting in a mutually opposing manner on the shutter with a view to its movement, a first spring urging the shutter away from the inlet opening and the second spring urging said shutter towards said inlet opening, wherein the force of the second spring is, on the one hand, at least equal to the force of the first spring and, on the other hand, less than the sum of the force of the first spring and the pressure force of the authorized gas stream on the shut-off member of the shutter, wherein said shutter is, in the absence of any gas stream, moved and held by the first spring in a detachment position, preferentially just corresponding to an absence of contact between the shut-off member and the inlet opening and/or the region of the latter, the valve being characterized in that it also comprises an arrangement and force transmission piece, which is mounted so as to be able to move with guidance in the hollow body, is subjected to the action of the second spring, which urges it in the direction of the region of the inlet opening, cooperates with the shutter and defines the detachment position of the latter. the elastic means (6, 7) consisting of two springs acting in a mutually opposing manner on the shutter with a view to its movement, a first spring urging the shutter away from the inlet opening and the second spring urging said shutter towards said inlet opening, wherein the force of the second spring is, on the one hand, at least equal to the force of the first spring and, on the other hand, less than the sum of the force of the first spring and the pressure force of the authorized gas stream on the shut-off member of the shutter, wherein said shutter is, in the absence of any gas stream, moved and held by the first spring in a detachment position, preferentially just corresponding to an absence of contact between the shut-off member and the inlet opening and/or the region of the latter, the valve being characterized in that it also comprises an arrangement and force transmission piece, which is mounted so as to be able to move with guidance in the hollow body, is subjected to the action of the second spring, which urges it in the direction of the region of the inlet opening, cooperates with the shutter and defines the detachment position of the latter.