A device for controlling fluid delivery comprises a hollow body (2) closed by opposed end walls (3, 4) having at least one inlet (5) and one outlet (6) respectively for a pressurized fluid and with a first variable-volume chamber (7) therein, between the inlet (5) and the outlet (6) for containing a first volume (Vj) of pressurized fluid, an obturating member (9) interacting with the downstream end wall (4) of the hollow body (2) for selectively closing the outlet (6), a guide member (8) associated with said obturating member (9) for guiding it between a first end closing position and a second end opening position of said outlet (6); and operating means (11) which are adapted to act upon the closure member (9) to promote sliding thereof in the hollow body (2) between the first and second positions. The obturating member (9) and the guide member (8) are movable relative to each other, the obturating member (9) being internally hollow to enclose the first chamber (7) and the guide member (8) has a passage (14) for allowing fluid communication between the inlet (5) and the first chamber (7). An air weapon incorporating the device.