Fisher 3560 Valve Positioner Manual Pdf
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Producers typically install valve positioners on the yolk or top casing of a pneumatic actuator for linear control valves. On rotary control valves, the valve positioner is installed in line with the valve and actuator stems on top of the actuator or on the side of the actuator. Installation depends on what type of actuator one uses.
Affixing the positioner to the actuators allows the positioner to measure the stem travel (linear valves) or degree of rotation (rotary valves). This also changes the position of the valve as required based on the input signal from the instrument controller.
When the process variable differs from the desired set point, the instrument controller sends an electrical or pneumatic signal to the positioner. This varies its pneumatic output to the actuator to move the valve open or closed accordingly. This occurs until the process variable reaches the desired set point.
The Siemens PS2 is one example of a digital valve positioner. The PS2 can remotely monitor and control any pneumatic valve. We offer it with many different communication protocols and enclosure options to meet customer needs. 2b1af7f3a8