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1. A valve assembly for pressurized containers, the valve assembly comprising a main structure, a rotary control element which is rotatably connected to the main structure and which is configured so as to allow a gas flow through the valve assembly in accordance with an angular position (a) of said rotary control element about a main rotation axis, a detection device which includes an angular position sensor and a movable member including a gear, the angular position sensor being configured to detect the angular position of the gear about an auxiliary rotation axis, wherein the gear is rotatably supported on the main structure and the angular position sensor is fixed to the main structure, wherein the main structure comprises a support arm which projects radially with respect to the main rotation axis and which defines a housing configured to support the angular position sensor and to rotatably support the gear, the gear of the movable member comprising a magnet, wherein the valve assembly further comprises a movement conversion mechanism which is configured so as to convert the movement of the rotary control element about the main axis into a corresponding rotational movement of the gear about the auxiliary axis, the auxiliary axis being parallel and not-aligned with respect to the main rotation axis, wherein the movement conversion mechanism comprises a first toothed portion which is fixedly joined to the control element in terms of rotation and a second toothed portion formed by the gear of the movable member, the magnet being joined to the gear such that rotation of the control element determines a corresponding rotation of the magnet about the auxiliary rotation axis via the movement conversion mechanism, wherein the first toothed portion of the control element directly meshes with the gear.
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