Owner manual

16
Function
7. FUNCTION
7.1. Function diagram
Diagram illustrating single-acting actuator
* Control system
1: Aeration valve
2: Bleed valve
Compressed-air
supply
Position
sensor
Position
controller
Control
system*
1
2
Position set-
point value
Exhaust air
Positioner Type 8791
Control valve with
single-acting actuator
Actual position
Figure 2: Function diagram, positioner type 8791
The remote design has the position sensor situated outside the positioner directly on the proportional
valve and is connected to the latter by a cable.
english
Type 8791