Patent ID: 7406910

Claim:
Device for controlling the position of a pneumatic actuator comprising: a pneumatically adjustable actuating element ( 5 ); a pneumatic actuating drive ( 6 ) for adjusting the actuating element ( 5 ); an electro-pneumatic position controller ( 1 ) for pneumatically driving the actuating drive ( 6 ) as a function of a position controller set point and a controlled variable; and at least one main pneumatic power amplifier ( 10 ) with bypass throttle for amplifying the power output of the position controller ( 1 ) and for pneumatically driving the actuating drive ( 6 ), characterized in that a pilot control pneumatic power amplifier ( 9 ) with a bypass throttle for preamplifying the pneumatic power output of the position controller ( 1 ) is installed between the position controller ( 1 ) and the main power amplifier ( 10 ).