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15
System description
5.4.3.
function diagram of the positioner with single-acting
actuator
The illustrated function diagram describes the function of the positioner (Type 8694).
Control system
1
2
Position
controller
Control system
1: Aeration valve
2: Bleed valve
Pressure
supply
Exhaust air
Position
measuring
system
Actual
position
external
position
set-point value
Positioner
Pneumatic actuator
(single-acting)
Valve
(actuator)
Figure 3:
Function diagram
English
Type 8694
Summary of Contents for 8694
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