A pneumatic differentiator comprises a damper, summing lever, outlet linkage and input rod. The damper is made as a body with two baffles with bases and rod separated by intermediate flange and pressed to the body by cover with formation of two cavities connected through at least one opening with adjustable choke, wherein the opening is arranged in the baffles, bases and flange. Along the summing lever a flat spring is additionally arranged, one end of the lever is connected to the baffle rod, second end is connected to the output linkage, and middle part through the flat spring is connected to the input rod.
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