Positioners
Meet specific parameters with accurate, robust, and reliable Fisher positioners.
Meet specific parameters with accurate, robust, and reliable Fisher positioners.
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
Legacy processing units may use pneumatic pressure signaling as the control set point to the control valves. In a common pneumatic positioner design, a pneumatic input signal is received from a control device and modulates the supply pressure to the control valve actuator, providing an accurate valve stem or shaft position that is proportional to the pneumatic input signal.
Most modern processing units use a 4 to 20 mA DC signal to modulate control valves. This introduces electronics into the positioner design and requires that the positioner convert the electronic current signal into a pneumatic pressure signal (current-to-pneumatic or I/P). In a typical analog I/P positioner, the converter receives a DC input signal and provides a proportional pneumatic output signal through a nozzle/flapper arrangement. The pneumatic output signal provides the input signal to the pneumatic positioner.
Learn how to mount a Fisher 3582 Positioner on a Fisher valve and actuator assembly.
Learn about proper calibration and beam alignment procedures for the 3582 positioner.
Learn about proper calibration procedures, including zero and span, for the 3582 positioner.
Learn how to mount a Fisher 3582 Positioner on a Fisher valve and actuator assembly.
Learn about proper calibration and beam alignment procedures for the 3582 positioner.
Learn about proper calibration procedures, including zero and span, for the 3582 positioner.
