Abstract: A movable shutter for a fluid conduit including two half-bodies consisting of a tube that forms a conduit, to the ends of which are affixed a flange and a plate having a bearing surface; a gate with a body defined by two longitudinal surfaces located opposite the bearing surfaces, which gate is mounted movably between the bearing surfaces, between a closed position and an open position; and a locking mechanism suitable for keeping the plates in a position in which they are either separated or close together, wherein at least one protruding element is provided on at least one of the bearing surfaces or on at least one of the longitudinal surfaces, such that if the gate is not properly positioned, the protruding element forms an obstacle that prevents the locking mechanism from keeping the plates in the position in which they are close together.

Abstract: A movable shutter for a fluid conduit including two half-bodies consisting of a tube that forms a conduit, to the ends of which are affixed a flange and a plate having a bearing surface; a gate with a body defined by two longitudinal surfaces located opposite the bearing surfaces, which gate is mounted movably between the bearing surfaces, between a closed position and an open position; and a locking mechanism suitable for keeping the plates in a position in which they are either separated or close together, wherein at least one protruding element is provided on at least one of the bearing surfaces or on at least one of the longitudinal surfaces, such that if the gate is not properly positioned, the protruding element forms an obstacle that prevents the locking mechanism from keeping the plates in the position in which they are close together.