Transducer of an electrical input signal into pneumatic output signals

A pneumatic actuator system, comprising:

• a pneumatic actuator having two inputs;
• two pneumatic amplifiers;
• an electro-pneumatic transducer, said transducer comprising
• a single rotating flapper,
• a pressure input connected to a source of pressure and two pneumatic outputs each having a respective pneumatic output signal,
• a setting unit comprising said single rotating flapper setting the pneumatic output signals by use of and proportional to at least one electrical input signal,
• the setting unit being designed to generate the two pneumatic output signals separately and reciprocal to each other as a function of the at least one electrical input signal by use of the single flapper,
• each of the two pneumatic output signals being connected as a respective pneumatic input signal to a respective input of the respective pneumatic amplifier whose respective output is connected to one of the respective inputs of said pneumatic actuator, the two pneumatic amplifiers being separate from each other;
• and
• said pneumatic actuator comprising a rotating actuator shaft and first and second pneumatic working chambers, each separate from the other, the output of one of the separate pneumatic amplifiers connecting to the first working chamber and the output of the other separate pneumatic amplifier connecting to the second pneumatic working chamber.