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1. A valve device of the normally closed type, suitable to selectively obstruct a flexible tube and comprising a first body and a second body operatively associated with each other, wherein said first and second bodies define a passage gap between them delimited on the entire perimeter and configured to be passed through by said flexible tube, and are mobile with respect to each other along a sliding axis, thus configuring an open operating position and a closed operating position, wherein said valve device comprises elastic means operatively associated with at least one of either said first or second body, said elastic means being configured to maintain said valve device in said closed operating position, and an actuation portion, integral with the first body, drivable to axially move said first body toward said open operating position, wherein said second body comprises an interference element which in said closed operating position is disposed protruding in said passage gap and in said open operating position is positioned outside said passage gap, and wherein said second body has a flat portion provided with through holes in which there are inserted longitudinal segments present in said first body, said first body in turn including a U-shaped housing portion having a transverse segment delimiting said passage gap.
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