The invention relates to a device for interrupting the ejection of air so as to save it without loss of efficiency or to allow successive shots at close intervals. The device fits in the configuration of the conventional air gun, with the tank (2), the body (1), the triggering device (3), the accelerated exhaust (4), the main piston (5) with its return spring (9) and the outlet port with its piston seat (8). The secondary piston (6) with its return spring (10) and the reserve chamber (7) also serving as a jacket of the pistons (5) and (6) are the additional components characterizing the invention. The device according to the invention is particularly intended for industries in which bulk material transfer operations, silted or air-free and industrial processes requiring the removal of crusts in high-temperature exchangers are involved. these uses are not restrictive.
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