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A high-speed valve has been designed for opening a deLaval nozzle in times less than 10-3 sec. IN connection with current experimental studies on the recombination rates of atoms in deLaval nozzles, it became necessary to develop a valve for opening •the nozzle in times less than about 10-3 sec. The material had to be chosen in such a way that the valve could withstand temperatures up to 100°C. The construction of the valve is shown in Fig. 1. In order to shut the nozzle-exit area (1), the plug-valve (2) is located at the bottom of a movable differential piston (3).

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