Fisher 3590 series , including the 3590S and 3590ST, are electro-pneumatic valve positioners that are now classified as obsolete products
. Manuals for these discontinued models are generally provided through archival files rather than current catalogs. Manual & Technical Resources Instruction Manual (Archived)
: The primary document for these units is Form 5370, which covers supplemental safety, installation, and maintenance for Types 3590, S, and ST. You can view or download an archived copy on Replacement & Parts
: While these are no longer manufactured, spare parts availability is typically guaranteed for 10 years after production ends for trim parts, and 5 years for die-cast and electronic components. Third-party refurbished units and data sheets can also be found at Stewart Instrument Key Specifications
The 3590 series is designed to convert an electrical input into a pneumatic output to control valve plug travel. Input Signals : 4–20 mA DC, 10–50 mA, or split-range signals. Supply Pressure
: Maximum of 50 psi (3.4 bar). It should typically be 5 psig higher than the upper range limit of the input signal. Internal Resistance : 300 Ohms (for 3590ST). : Can be configured for Direct or Reverse action. Travel Range : Supports valve plug travel from 7/16 to 4 1/8 inches. Stewart Instrument Safety and Maintenance Qualified Personnel
: Maintenance should only be performed by trained technicians. Depressurization
: Always isolate the control valve from process pressure and release all pressure from both sides of the valve body before maintenance. Hazardous Areas
: These units are often rated for Class I, Groups B, C, and D hazardous locations.
For further technical support or to request official legacy documentation, it is recommended to contact an Emerson Sales Office or your local business partner. replacement parts for a specific 3590 model, or are you looking for calibration steps
The Fisher 3590 manual is the essential roadmap for installing, calibrating, and maintaining one of the industry's most reliable pneumatic valve positioners. These electro-pneumatic positioners are the workhorses of control loops, ensuring that a valve stem moves exactly where the controller tells it to go. Overview of the Fisher 3590 Series
The Fisher 3590 series consists of pneumatic and electro-pneumatic positioners designed for use with diaphragm-actuated valves. They use a feedback linkage to sense the actual valve position and compare it to the input signal from the control system. Key Components Input Module: Receives the 4-20mA or pneumatic signal. fisher 3590 valve positioner manual
Beam and Flapper Assembly: The heart of the pneumatic amplification.
Feedback Linkage: Connects the valve stem to the positioner. Relay: Amplifies the air signal to move the actuator. Installation Procedures
Proper installation is critical to prevent "hunting" or sluggish response. According to the Fisher 3590 manual, these steps are foundational:
Mounting: Secure the positioner to the actuator yoke using the provided mounting bracket. Ensure the feedback pin is centered in the linkage slot.
Pneumatic Connections: Connect the supply air (typically 20 to 100 psi depending on the model) to the "Supply" port. Connect the "Output" port to the actuator diaphragm.
Venting: Ensure the exhaust vent is unobstructed. In corrosive environments, use a vent pipe to carry exhaust gases away. Calibration Steps
Calibration aligns the instrument's input signal with the valve's physical stroke. 1. Zero Adjustment Apply the low-end signal (e.g., 4mA or 3 psi).
Turn the zero adjustment screw until the valve just begins to move from its seat. 2. Span Adjustment Apply the high-end signal (e.g., 20mA or 15 psi).
Adjust the span ratio arm or screw until the valve reaches its full rated travel. 3. Iteration Zero and span adjustments are interactive.
Repeat the steps until both the 0% and 100% points are accurate. Maintenance and Troubleshooting
The Fisher 3590 is known for its durability, but environmental factors like "wet" instrument air can cause issues. Common Issues Fisher 3590 series , including the 3590S and
Constant Bleeding: Usually indicates a dirty relay or a torn diaphragm.
Sluggish Response: Often caused by a clogged primary orifice or low supply pressure.
Valve Hunting: Check for loose feedback linkages or excessive friction in the valve packing. Cleaning the Orifice
The manual recommends cleaning the primary orifice periodically. Use a small wire or cleaning tool to clear debris without enlarging the hole, as this can change the gain of the positioner. Safety Warnings
⚠️ Depressurize the Line: Never work on a positioner while the process line is under pressure.⚠️ Supply Air Quality: Use only clean, dry, oil-free instrument air (ISA Standard S7.3) to prevent internal clogging.⚠️ Intrinsic Safety: If using the electro-pneumatic version in a hazardous area, ensure all barriers and seals meet local electrical codes.
📍 Pro Tip: Always record the final calibration settings in your maintenance log for future reference. AI responses may include mistakes. Learn more
You're looking for a solid paper covering or a comprehensive manual for the Fisher 3590 Valve Positioner. Here's some information that might be helpful:
Fisher 3590 Valve Positioner Manual
The Fisher 3590 valve positioner is a popular device used to control the position of a valve in various industrial applications. The manual for this device typically includes detailed information on installation, operation, maintenance, and troubleshooting.
Contents of the Manual
A comprehensive manual for the Fisher 3590 Valve Positioner may cover the following topics: Types of Manuals There are different types of
Types of Manuals
There are different types of manuals available for the Fisher 3590 Valve Positioner, including:
Sources for the Manual
You can obtain a manual for the Fisher 3590 Valve Positioner from the following sources:
If you're unable to find a manual online, you can also try contacting Emerson Electric Co. or Fisher Controls directly to request a copy of the manual.
The Fisher 3590 series is a family of heavy-duty, pneumatic valve positioners designed for precision stroke and angle positioning of rotary and sliding-stem control valves. The Fisher 3590 Positioner Manual serves as the definitive technical reference for installation, calibration, operation, and maintenance of this rugged, field-reversible instrument.
Before handling the device, you must identify the main components as listed in the Fisher 3590 manual:
| Component | Function | |-----------|----------| | Flopper (flapper) | Nozzle-flapper mechanism to convert small signal changes to pressure. | | Nozzle | Receives supply air; backpressure changes move the pilot relay. | | Range spring | Provides force balance against the input signal diaphragm. | | Feedback spring | Connects to the valve stem via a cam/arm; closes the loop. | | Pilot relay | Amplifies nozzle pressure to high flow output. | | Proportional cam | Defines the relationship between travel and feedback. | | Zero adjustment screw | Sets the starting point (signal vs. position). | | Span adjustment screw | Sets the travel range for a given input span. |
Manual Tip: Always verify the actuator type (diaphragm, piston, spring-return) and required output action before mounting. The manual provides separate piping diagrams for double-acting and single-acting actuators.
| 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 |
For 4–20 mA models with I/P: