Locate the mechanism (usually a shiftable flapper or thumb screw along the feedback lever).
As the bellows moves, it shifts a beam and flapper. This changes the pressure in the relay, which then sends air to the actuator to move the valve. Fisher 3560 Valve Positioner Manual Pdf
: Emerson Fisher 3560 Valve Positioner Instruction Manual Locate the mechanism (usually a shiftable flapper or
Increase the input signal to its maximum value (e.g., 15 psig). Observe the full stroke of the valve stem. Fisher 3560 Valve Positioner Manual Pdf