As a common control valve accessory, the valve
positioner delivers pressurized air to the valve actuator so that the
position of the valve stem or shaft corresponds to the set point from
the control system. Valve positioners are typically pneumatic or analog
I/P and are used when a valve requires throttling action. They require
position feedback from the valve stem or shaft and deliver pneumatic
pressure to the actuator to open and close the valve.
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