Device and method for controlling the position of a pneumatic actuator

Process for controlling the position of a pneumatic actuator, which comprises 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).

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) without 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).