Function Diagram Of The Positioner With Single-Acting Actuator - Alfa Laval TopControl Basic Manuel D'utilisation

Type 8694
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).
external
position
set-point value
Positioner
Pneumatic actuator
(single-acting)
Figure 3: Function diagram
Position
controller
Actual
position
Control system
Position
measuring
system
Valve
(actuator)
Control system
1: Aeration valve
2: Bleed valve
1
Pressure
supply
2
Exhaust air
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