Suspended in housing 1 is bellows 2 filled with air. The space in housing 1 is connected through passage a to a high-pressure chamber. Linked to bellows 2 is valve spool 3. When the pressure in housing 1 exceeds the design value, bellows 2 is compressed and spool 3 is shifted upward. This connects cylinder 4 to channel 5 which leads to the low-pressure mains and the crankcase. Then piston 6 is moved to the left by spring 7 and gear rack 8, attached to piston 6 and meshing with segment gear 9, turns the gear about fixed axis A. Throttle valve 10, rigidly attached to gear 9, turns and reduces the air pressure at the carburettor output. When the air pressure drops in housing 1, bellows 2 stretches and shifts valve spool 3 downward. At this, the left end of cylinder 4 is connected to the high- pressure fluid mains. The fluid moves piston 6 to the right, compressing spring 7 and turning throttle valve 10 in the direction of a larger opening, thereby increasing the air pressure at the carburettor output. The required pressure at the carburettor output is set by adjusting nut 11.
$4106$EHP,Rg$