Fisher 3590 Valve Positioner Manual [new] May 2026

The Fisher Type 3590 series (including S and ST variants) consists of electro-pneumatic valve positioners that are now classified as obsolete/discontinued by Emerson. They were designed to convert a DC input signal (typically 4–20 mA) into a proportional pneumatic output pressure to precisely position a control valve stem.  Technical Specifications 

Input Signal: Standard 4–20 mA DC, 10–50 mA, or split-range options. Internal Resistance: Approximately 300 ohms.

Supply Pressure: Maximum of 50 psi (approx. 3.4 bar); generally requires pressure 5 psi higher than the upper range limit of the input signal.

Valve Plug Travel: Supports travel ranging from 7/16 to 4 1/8 inches.

Action: Field-reversible for either direct or reverse action.

Ambient Temperature: Rated for operation between -40°F and 150°F (-40°C to 65°C).  Safety & Maintenance 

The Fisher 3590 Supplemental Safety Instructions emphasize that maintenance should only be performed by qualified personnel.  Calibrating a Fisher™ 3582 Positioner - Zero and Span

Fisher 3590 series of electro-pneumatic valve positioners is an obsolete product line formerly manufactured by Fisher Controls (now part of Emerson)

. Because it is discontinued, the "full paper" or instruction manual is no longer hosted on the main Emerson product pages, but documentation remains available through historical archives and technical resource libraries. Manual Availability

The primary instruction manual for this series is typically found under historical Fisher documentation. Archival Access: You can view or download the manual on the Scribd Archive for Fisher 3590 Alternative Support:

For official legacy support, it is recommended to contact an Emerson Sales Office

directly, as they maintain the "Fishweb" database for obsolete product manuals Key Specifications (3590 / 3590ST)

The 3590ST model was a common variant in this series. Its technical highlights include: Input Signal: 4-20 mA DC (300 Ohms internal resistance) Supply Pressure: Maximum of 50 psi Ambient Temperature: -40° to 150°F (-40° to 65°C) Classification: Class I, Groups B, C, and D (hazardous area certified) Product Status & Maintenance Obsolescence:

These products are no longer manufactured. Recommended spare parts were guaranteed for 10 years after production ended, meaning original parts are now largely sourced through second-hand or specialized industrial surplus retailers Modern Replacement:

For current applications requiring similar functionality, Emerson typically recommends the Fisher DVC6200 series of digital valve controllers or to find a compatible replacement for an existing unit?

The Fisher 3590 Go to product viewer dialog for this item. is a legacy electro-pneumatic (I/P) valve positioner designed to convert electrical input signals into proportional pneumatic output pressure to control valve stem position. While the manufacturer has discontinued this specific series, it remains available through specialized retailers and the secondary market. Key Features and Specifications

Input Signal Options: Accepts standard 4-20 mA DC or 10-50 mA DC signals, with split-range capabilities available. fisher 3590 valve positioner manual

Operational Versatility: Supports both Direct and Reverse action, which can be configured in the field.

Physical Range: Capable of producing valve plug travel ranging from 7/16 to 4-1/8 inches.

Internal Characteristics: Features an internal resistance of 300 Ohms.

Environmental Limits: Designed for ambient temperatures between -40°F and 150°F (-40°C to 65°C).

Hazardous Area Rating: Complies with Class I, Groups B, C, and D requirements for use in potentially explosive environments.

Supply Pressure: Requires a supply pressure generally 5 psi higher than the upper range limit of the input signal, with a maximum rated supply of 50 psi. Product Options and Availability

Various configurations and related components are available through retailers like Aeliya Marine Tech, Radwell International, and NRI Industrial Sales. Model Variant Key Details Approx. Price Fisher 3590ST Go to product viewer dialog for this item. Electro-pneumatic, 4-20 mA, 0-160 psi capability $308 - $314 Fisher 3590S Standard I/P positioner, 4-20 mA input ~$252 (Repair) Fisher 3590 with 667 Actuator Go to product viewer dialog for this item. Combined assembly with EZ body and 1/2" NPT ports

Manuals and supplemental instruction forms (such as Form 2403) provide critical details for qualified personnel regarding installation and maintenance to ensure proper grounding and safety.

The Fisher 3590 series consists of electro-pneumatic valve positioners designed to accurately throttle control valves by converting an electrical signal into a proportional pneumatic output. Although the series is largely discontinued by the manufacturer, technical documentation and units remain available through secondary suppliers and archives. General Specifications

The 3590 series typically includes the standard 3590, 3590S, and 3590ST models. Input Signal: 4 to 20 mA DC. Internal Resistance: Approximately 300 Ohms. Supply Pressure: Maximum 50 psig.

Ambient Temperature Limits: -40° to 150°F (-40° to 66°C).

Pressure Connections: Typically 1/4 NPT for supply and output; 3/8 NPT for vent. Manual & Maintenance Resources

Detailed instruction manuals for installation, calibration, and parts can be accessed through the following sources:

Digital Archives: A supplemental instruction manual for Types 3590, S, and ST is available on Scribd.

Product Listings: Detailed technical snapshots and warranty information for the 3590S model can be found at Radwell International.

Discontinued Support: Official documentation for discontinued Fisher products is often archived on the Emerson Discontinued Products Page. Installation & Safety The Fisher Type 3590 series (including S and

The Fisher 3590 (including S and ST variants) is a legacy electro-pneumatic valve positioner series widely regarded for its ruggedness and reliability in harsh industrial environments. While Emerson officially classifies the 3590 as an obsolete product, it remains a staple in secondary markets due to its straightforward mechanical design and high compatibility with existing Fisher control technology. Performance Review

Precision & Speed: This series is praised for providing an output signal directly proportional to the valve stem position, significantly increasing the speed of response compared to using an I/P transducer alone.

Mechanical Feedback: It uses a mechanical feedback linkage (cam-and-beam) that effectively minimizes hysteresis and negates flow-induced reactions, ensuring the valve maintains its setpoint even under high pressure drops.

Operating Range: The 3590ST typically handles a standard 4-20mA input signal with internal resistance around 300 Ohms and can manage supply pressures up to 50 PSI. Pros & Cons

The Comprehensive Guide to Fisher 3590 Valve Positioner Manual

The Fisher 3590 valve positioner is a highly reliable and versatile device used in various industrial applications to control the position of valves. As a crucial component in process control systems, understanding the operation, maintenance, and troubleshooting of the Fisher 3590 valve positioner is essential for ensuring optimal performance and safety. In this article, we will provide an in-depth look at the Fisher 3590 valve positioner manual, covering its features, installation, operation, maintenance, and troubleshooting procedures.

Introduction to Fisher 3590 Valve Positioner

The Fisher 3590 valve positioner is a pneumatic device designed to accurately position valves in response to a control signal. It is widely used in various industries, including oil and gas, chemical processing, power generation, and water treatment. The device is known for its high accuracy, reliability, and durability, making it a popular choice among process control professionals.

Key Features of Fisher 3590 Valve Positioner

The Fisher 3590 valve positioner has several key features that make it an ideal choice for industrial applications:

• High accuracy: The device provides precise control over valve position, ensuring accurate regulation of process fluids.
• Reliability: The Fisher 3590 valve positioner is designed to operate in harsh environments, with a rugged construction that withstands extreme temperatures, vibrations, and corrosive substances.
• Versatility: The device can be used with various types of valves, including linear and rotary valves.
• Easy maintenance: The Fisher 3590 valve positioner has a modular design, making it easy to maintain and repair.

Installation of Fisher 3590 Valve Positioner

Proper installation of the Fisher 3590 valve positioner is crucial for ensuring optimal performance and safety. The following steps should be followed:

1. Mounting: The device should be mounted on a flat surface, with the valve stem or shaft aligned with the positioner.
2. Air supply: The positioner requires a clean and dry air supply, which should be connected to the device.
3. Electrical connections: The positioner should be connected to the control system, following the manufacturer's instructions.
4. Calibration: The device should be calibrated according to the manufacturer's instructions, to ensure accurate operation.

Operation of Fisher 3590 Valve Positioner

The Fisher 3590 valve positioner operates by using a control signal to position the valve. The device has several operating modes, including:

• Automatic mode: The positioner responds to the control signal, adjusting the valve position to maintain the desired process variable.
• Manual mode: The positioner allows manual adjustment of the valve position, for maintenance or testing purposes.

Maintenance of Fisher 3590 Valve Positioner

Regular maintenance is essential to ensure optimal performance and extend the lifespan of the Fisher 3590 valve positioner. The following maintenance procedures should be performed: High accuracy : The device provides precise control

• Routine inspection: The device should be inspected regularly, to check for signs of wear or damage.
• Cleaning: The positioner should be cleaned regularly, to prevent dirt and debris from accumulating.
• Replacement of parts: Worn or damaged parts should be replaced promptly, to prevent downtime and ensure optimal performance.

Troubleshooting Fisher 3590 Valve Positioner

Troubleshooting the Fisher 3590 valve positioner requires a systematic approach, to identify and resolve issues quickly. The following troubleshooting procedures should be followed:

• Check the air supply: Ensure that the air supply is clean, dry, and at the correct pressure.
• Check electrical connections: Verify that electrical connections are secure and not damaged.
• Check valve position: Verify that the valve position is accurate, and adjust the positioner as needed.

Fisher 3590 Valve Positioner Manual

The Fisher 3590 valve positioner manual provides detailed information on the device's operation, maintenance, and troubleshooting procedures. The manual covers the following topics:

• Introduction: Overview of the device, its features, and applications.
• Installation: Step-by-step instructions for installing the device.
• Operation: Description of the device's operating modes and procedures.
• Maintenance: Schedule and procedures for routine maintenance.
• Troubleshooting: Guide to identifying and resolving common issues.

Conclusion

The Fisher 3590 valve positioner is a highly reliable and versatile device used in various industrial applications. Understanding the operation, maintenance, and troubleshooting procedures of the device is essential for ensuring optimal performance and safety. The Fisher 3590 valve positioner manual provides detailed information on the device's operation, maintenance, and troubleshooting procedures, making it an essential resource for process control professionals.

Downloads

• Fisher 3590 Valve Positioner Manual (PDF)
• Fisher 3590 Valve Positioner Installation Guide (PDF)
• Fisher 3590 Valve Positioner Troubleshooting Guide (PDF)

Specifications

• Model: Fisher 3590
• Type: Pneumatic valve positioner
• Input signal: 4-20 mA
• Output signal: Pneumatic signal to valve actuator
• Operating temperature: -20°C to 70°C (-4°F to 158°F)
• Supply pressure: 1.4 to 6.9 bar (20 to 100 psig)

FAQs

• Q: What is the Fisher 3590 valve positioner used for? A: The Fisher 3590 valve positioner is used to control the position of valves in various industrial applications.
• Q: How do I install the Fisher 3590 valve positioner? A: The device should be mounted on a flat surface, with the valve stem or shaft aligned with the positioner. The air supply and electrical connections should be connected according to the manufacturer's instructions.
• Q: How do I troubleshoot the Fisher 3590 valve positioner? A: Troubleshooting the device requires a systematic approach, checking the air supply, electrical connections, and valve position. The manufacturer's instructions and troubleshooting guide should be consulted for detailed procedures.

Part 1: Overview of the Fisher 3590 Positioner

The Fisher 3590 is a pneumatic, force-balance, field-reversible positioner. Its primary function is to compare a pneumatic input signal (typically 3-15 psi or 3-27 psi) with the actual valve stem position. It then supplies or exhausts supply pressure to the actuator to maintain the exact position commanded.

The Definitive Guide to the Fisher 3590 Valve Positioner: Manual Insights, Operation, and Troubleshooting

Keywords: Fisher 3590 valve positioner manual, installation, calibration, troubleshooting, pneumatic positioner, Emerson

1. What is the Fisher 3590?

The Fisher 3590 is a pneumatic, force-balance valve positioner. It receives a 3–15 psig (0.2–1.0 bar) or split-range input signal and delivers an output pressure to the actuator to precisely position the valve stem. It is commonly used with sliding-stem valves and can be adapted for rotary actuators.

6. Troubleshooting Common Issues

| Problem | Likely Cause (per manual) | Suggested Fix | |---------|----------------------------|----------------| | Valve does not move at any signal | No supply air / blocked filter | Check supply pressure, clean filter | | Hysteresis or dead band >2% | Worn flapper or nozzle | Replace flapper/nozzle assembly | | Slow response | Relay orifice blocked | Clean relay (see manual Section 5) | | Positioner oscillates | Gain too high | Adjust damping restriction screw | | Zero shifts after calibration | Loose feedback arm clamp | Tighten clamp per torque spec in manual |

Step 2 – Zero Adjustment

• Apply minimum input signal (e.g., 3 psi).
• Loosen the lock nut on the zero adjustment screw.
• Turn the screw to move the flapper until the actuator just begins to move the valve from its seat.
• For spring-return actuators, set the valve exactly at its closed position.

Zero & Span Adjustment:

| Step | Action | |------|--------| | 1 | Apply lowest input signal (e.g., 3 psi for direct acting). | | 2 | Using zero screw, adjust until valve just starts to move or reaches its initial position (confirmed via stem travel indicator). | | 3 | Apply highest input signal (e.g., 15 psi). | | 4 | Using span screw, adjust until valve reaches full travel (e.g., 100% stroke). | | 5 | Repeat steps 1–4 until both low and high signal points are correct without interaction. |

Note: Changes to span will slightly affect zero; iterate 2–3 times for fine accuracy.

Special Case: Split-Range Operation

If two positioners share one input signal (e.g., one valve opens 3–9 psi, the other 9–15 psi), the manual specifies using different range springs and a precise zero/span adjustment. Failure to deadband properly will cause overlapping or gap.

Troubleshooting Guide (Manual’s Diagnostic Flow)

The manual organizes failures into four categories:

1. Hunting (Oscillation): Primary cause is excessive actuator volume or a missing volume booster. The manual recommends adding a pneumatic relay (Fisher 2625) for large actuators >10 gallons.
2. Slow Response: Usually the feedback spring is too stiff or the supply regulator is undersized. The manual includes a table of minimum tubing ID vs. actuator size.
3. Deadband >2%: Caused by friction in the feedback linkage. The manual shows how to inspect the nylon bushings on the feedback shaft—they wear after ~500k cycles.
4. No Movement on Signal Change: Check the internal filter screen (located under the inlet port). The manual provides a part number (filter 1A896429012) that must be replaced, not cleaned.