The change in nozzle pressure controls the pneumatic relay, which changes the output pressure sent directly to the valve actuator.
The Fisher 3582 is a robust pneumatic valve positioner, while the Fisher 3582i is an electro-pneumatic version. Both are used with diaphragm-actuated, sliding-stem control valve assemblies. The following table highlights their primary distinctions: Fisher 3560 Valve Positioner Manual Pdf
Fisher publishes safety integrity level (SIL) data in their manuals. If your plant requires SIL compliance, you must follow the installation and proof-test procedures from the official PDF. The change in nozzle pressure controls the pneumatic
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