Fisher 3582/3581i Positioner - 582i Converter

Fisher 3582 pneumatic valve positioners and 3582i electro-pneumatic valve positioners,are used with diaphragm-actuated, sliding-stem control valve assemblies. The pneumatic valve positioners receive a pneumatic input signal from a control device and modulate the supply pressure to the control valve actuator, providing an accurate valve stem position that is proportional to the pneumatic input signal.

Features include

• 3582NS positioners are designed for nuclear power applications. The 3582NS construction includes materials that provide superior performance at elevated temperature and radiation levels. The O-rings are EPDM (ethylene propylene) and the diaphragms are EPDM/meta-aramid. EPDM demonstrates superior temperature capability and shelf life over nitrile.
• The meta-aramid diaphragm fabric demonstrates improved strength retention at elevated temperature and radiation conditions.
• The 3582i electro-pneumatic valve positioner consists of a Fisher 582i electro-pneumatic converter installed on a 3582 pneumatic valve positioner. The 3582i provides an accurate valve stem position that is proportional to a DC current input signal.
• The 582i electro-pneumatic converter is a modular unit that can be installed at the factory or in the field.
• The converter receives a DC current 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, eliminating the need for a remote mounted transducer.

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