High-pressure air is delivered along pipe 1 and through nozzle 2 into chamber a of the reducer. As the pressure increases, membrane 4 bends upward, overcoming the resistance of spring 5. As a result, spring 6 lifts shackle 3, and the input nozzle is closed by rubber disk 7 (as shown). When the pressure drops, membrane 4 is bent downward by spring 5, so that shackle 3 opens nozzle 2 slightly. At this, the pressure in chamber a increases to the required value.
$4083$EHP,M$