Function - Burkert 8630 Operating Instructions Manual

3.2

Function

The figure 3.4 shows the functional diagram of the positioner in combination with a single acting piston valve.
Process
setpoint
external
position
setpoint
Top Control
Pneumatic actuator
(single acting)
Control valve
(Control output)
Fig. 3.4: Functional diagram of the positioner in combination with a single acting piston valve
Top Control Positioner
Process value
Position
Process
setpoint
controller
Position
controler
Position
feedback
Actuator
Displacement
measurement
system
Actuator
1: Air inlet valve
2: Air exhaust valve
Pressure air inlet
Air exhaust
Sensor
Process value
(Flow, pressure, level,
temperature, ...)
77