Emerson Fisher 3582 Electro Pneumatic Single-Acting Valve Positioner with ASCO Solenoid Valves

The Fisher 3582 is a high-performance pneumatic valve positioner engineered for accurate positioning of diaphragm-actuated sliding-stem control valves. It converts a pneumatic input signal into a proportional actuator pressure, ensuring the valve stem position matches the control demand. Available in multiple configurations (3582, 3582A, 3582C, 3582D, 3582G, 3582NS), it offers bypass capability and gauge options for maximum flexibility.

• Beam alignment and calibration procedures ensure precise zero and span adjustment
• Characterized cams (B & C) allow modification of inherent valve flow characteristics (equal percentage or linear)
• Low air consumption and high open-loop gain (typically 100 for 0.2–1.0 bar range)
• EPDM elastomers available for elevated temperature and radiation resistance (3582NS)
• Diagnostic connections available for advanced valve signature testing

Widely used in severe-service process plants, power generation (including nuclear), and any application requiring precise pneumatic control of sliding-stem valves under varying supply pressures or environmental conditions.

1. Q: How often should beam alignment be performed?
2. A: Only when replacing the beam pivot pin, bellows assembly, range spring, or converting to split-range operation.
3. Q: What is the minimum stem travel possible with the travel pin?
4. A: As low as 11 mm (0.4375 in) when the travel pin is set to equal valve travel and input signal span is minimized.
5. Q: Can natural gas be used as supply medium?
6. A: Yes for 3582 pneumatic models (with proper venting); not approved for 3582i.

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