Brand: Fisher

Fisher 3582 and 3582i Pneumatic and Electro-Pneumatic Positioner

Name: Fisher 3582 3582i Valve Positioner | Oman
Brand: Fisher
SKU: 3582

Description

Fisher 3582 and 3582i positioners with the 582i converter

The Fisher 3582 is a pneumatic valve positioner for diaphragm-actuated, sliding-stem control valves. It takes a pneumatic signal from a controller and adjusts the supply pressure going to the actuator until the stem position is proportional to that signal. Add the 582i electro-pneumatic converter and the same positioner becomes the 3582i, which accepts a 4 to 20 mA DC signal instead. The family also includes a nuclear-service version, the 3582NS, and several configurations that differ in bypass valve and gauge fitting. Seven Star LLC supplies Fisher 3582 and 3582i positioners in Oman and the GCC as an independent supplier in Muscat. This page follows the Fisher product bulletin 62.1:3582 (D200062X012, November 2019).

3582 and 3582i technical specifications

Parameter	Specification
Manufacturer / part number	Fisher (Emerson) / 3582, 3582i (582i converter)
Input signal	3582: 0.2 to 1.0 bar (3 to 15 psig), 0.4 to 2.0 bar (6 to 30 psig) or split range; 3582i: 4 to 20 mA DC, 30 V DC maximum compliance, split range possible
Output signal	Pneumatic, up to 95 percent of maximum supply; field-reversible direct or reverse action
Supply pressure	Recommended 0.3 bar (5 psi) above actuator requirement; maximum 3.4 bar (50 psig) or the actuator rating
Supply medium	Air or natural gas (the 3582i is not approved for natural gas)
Independent linearity	3582: ±1 % of output span; 3582i: ±2 %
Hysteresis	3582: 0.5 % of span; 3582i: 0.6 %
Open loop gain	100 for 3 to 15 psig range; 55 for 6 to 30 psig range
Air consumption (steady state, 2.0 bar supply)	3582: 0.48 normal m³/h; 3582i: 0.57 normal m³/h
Maximum supply air demand (2.0 bar)	6.7 normal m³/h
Valve stem travel	Up to 105 mm (4.125 in.), adjustable to lesser travel
Temperature limits	Standard −40 to 71 °C; 3582NS −40 to 82 °C; high-temperature 3582A and C −18 to 104 °C without gauges
Connections	1/4 NPT pressure; 1/2-14 NPT conduit for 3582i
Approximate weight	3582: 2.5 kg; 3582i: 3.6 kg

How the 3582 positioner works

Supply air feeds a relay and, through a fixed restriction, a nozzle that is covered or uncovered by a flapper. The input signal acts on a bellows. When the signal rises, the bellows moves a beam that brings the flapper closer to the nozzle, nozzle pressure builds, and the relay raises the output pressure to the diaphragm actuator, which drives the stem down. A cam on the feedback axis follows stem movement and tilts the beam back until the flapper reaches an equilibrium. When the signal falls, an internal range spring and the bellows move the flapper away, nozzle pressure drops and the relay exhausts actuator pressure. Changing from direct to reverse action is a field adjustment. Because the bleed air continually purges the internals, the instrument tolerates harsh atmospheres.

The 582i electro-pneumatic converter

The 582i is a modular nozzle-and-flapper unit that converts a DC current signal into a proportional pneumatic signal and feeds it to the positioner, so no remote transducer is needed. It can be factory fitted or retro-fitted in place of the gauge block on a 3582. Upgrading in the field may require a change of mounting and input range, so check this with the supplier first. The 582i housing is classified CSA Type 3, FM NEMA 3 / IP54, ATEX IP64 and IECEx IP54, with intrinsically safe, type n and flameproof classifications listed for CSA, FM, ATEX and IECEx.

3582 type numbers and what they mean

Type	Configuration
3582	Pneumatic positioner with bypass and instrument, supply and output gauges
3582A	Without bypass and without gauges
3582C	Without bypass, with automotive tire valves in place of gauges
3582D	With bypass and tire valves
3582G	Without bypass, with three gauges
3582NS	Nuclear service, with or without bypass, tire valves, EPDM parts
3582i	3582 with 582i converter for 4 to 20 mA input

Choosing a Fisher 3582 or 3582i

Control signal: pneumatic (3582) or 4 to 20 mA (3582i). The 3582i is not for natural gas supply.
Actuator: diaphragm-actuated sliding-stem valves up to 105 mm stem travel; a rotary valve needs a different positioner family such as the 3610J.
Bypass and gauges: choose the type letter to suit whether you want a bypass for manual operation, gauges or tire valves.
Range: 3 to 15 or 6 to 30 psig input, or a split range in two or three sections. Two-way split ranges are listed as 3 to 9 and 9 to 15 psig, or 4 to 12 and 12 to 20 mA on the 3582i.
Characterised cams B and C, connectors for diagnostic testing and a high-vibration option are offered.
Hazardous area: ATEX Group II Category 2 gas and dust classification is stated for the pneumatic positioner; electrical approvals apply to the 582i.

Installation, calibration and maintenance

Mount the instrument with the vent on the side or the bottom when weatherproofing matters. Zero and span adjustments are accessible with the cover removed and use a screwdriver or spanner. Supply medium should be clean, dry and oil-free, particularly on EPDM-equipped instruments. Common maintenance work is replacing the relay diaphragms and O-rings, cleaning the nozzle and checking the bellows connections. Because the 3582 family is common across plants, one set of spares covers many positioners. Pair it with a filter regulator and, for fast stroking of large actuators, a 2625 volume booster.

Where the 3582 is used in Oman and the GCC

Pneumatic positioners remain widespread on older diaphragm-actuated control valves in refineries, gas plants, power stations and desalination plants. Retaining a 3582 with a 582i converter allows a plant to move a valve from pneumatic to 4 to 20 mA control without replacing the valve or actuator. The corrosion-resistant case and bleed-air purge suit humid coastal sites, and the high-temperature construction suits valves located near hot piping.

Related Fisher instruments

For newer installations see the FIELDVUE DVC2000 and DVC6200, or the 3610J pneumatic positioner for rotary valves. Related accessories include the 2625 volume booster.

Information to send with an RFQ

Type letter wanted (3582, 3582A, 3582C, 3582D, 3582G or 3582NS) and whether it should be pneumatic or 3582i.
Valve and actuator model, stem travel and actuator pressure range.
Input signal range or split-range requirement and direct or reverse action.
Supply medium and pressure, ambient temperature and approval needed.
Cam option, diagnostic connectors and high-vibration option.

Documents and quotation

The Fisher 3582 and 3582i product bulletin is attached to this page as a datasheet. Send the details above and we will confirm the matching type and prepare a quotation.

Datasheets & Documents

Datasheet Fisher 3582 Product Bulletin Download

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About brand

Fisher is the control valve brand of Emerson. Its history starts in 1880 in Marshalltown, Iowa, where William Fisher, working at the town waterworks, invented a constant-pressure pump governor and founded a company to make it. Emerson bought Fisher Controls in 1992, and Marshalltown remains a main engineering and manufacturing site for Fisher valves. The brand covers control valves, actuators, FIELDVUE digital valve controllers, regulators and level controllers.

Seven Star LLC is an independent supplier listing Fisher control valves, actuators, positioners, regulators and spare parts for buyers in Oman and the GCC. Replacement valves and trim are matched from the serial number on the valve nameplate.

Fisher company profile

Origin	William Fisher's constant-pressure pump governor, Marshalltown, Iowa, USA (1880)
Ownership	Owned by Monsanto from 1969; sold to Emerson in 1992 and combined with Rosemount as Fisher-Rosemount, later Emerson Process Management. Today a brand of Emerson.
Main site	Marshalltown, Iowa, USA
Product families	Sliding-stem and rotary control valves, spring-diaphragm and piston actuators, FIELDVUE digital valve controllers, pressure regulators, displacer and digital level controllers
Typical duty	Throttling control of liquids, gas and steam, high-pressure and severe service, instrument supply and gas pressure reduction

Milestones

1880: William Fisher builds a constant-pressure pump governor in Marshalltown, Iowa.
1969: Monsanto acquires Fisher Controls.
1992: Emerson buys Fisher and combines it with Rosemount as Fisher-Rosemount, later Emerson Process Management.

Fisher valves, actuators and instruments

Series	Type	Typical use
easy-e ES, ET, EZ	Sliding-stem globe and angle valves	Cage-guided globe valves: ES with unbalanced plug, ET with balanced trim for higher pressure drop; EZ unbalanced with a seat ring retainer for viscous or dirty fluids
GX	Compact globe valve with integral actuator	Standard chemical and process duty where a compact valve package is preferred
HPT, HPAT	High-pressure globe and angle valves	Pressure classes up to ASME CL2500, compressor recycle and high-pressure letdown
V150, V200, V300, V250	Vee-Ball segmented ball and full-bore ball control valves	High-capacity control of liquids, gas and fibrous or slurry service
CV500	Eccentric rotating plug valve	Erosive, coking and dirty service
8560, 8580	High-performance butterfly valves	Large-line throttling and on-off control
657, 667, 1052, 1061, easy-Drive	Spring-diaphragm, piston and electric actuators	657 and 667 for sliding-stem valves; 1052 and 1061 for rotary valves; easy-Drive where no air is available
FIELDVUE DVC6200, DVC2000, 3610J	Digital valve controllers and positioners	HART positioning with valve diagnostics; 3610J pneumatic positioner for rotary actuators
627, 1098-EGR, 67C	Pressure regulators	Gas pressure reduction, pilot-operated regulation and instrument air supply
DLC3100, 2500	Digital and pneumatic level controllers	Displacer level and interface on separators and scrubbers

Where Fisher valves are used

Fisher control valves and regulators are standard equipment in oil and gas production, refineries, gas processing and LNG, petrochemicals, power plants and water systems. Typical loops are separator level and pressure, compressor anti-surge and recycle, fuel gas pressure reduction, feedwater and steam control, and chemical dosing. FIELDVUE controllers add diagnostics that help plan valve maintenance before a turnaround.

Ordering Fisher valves and spare parts: what we need

For spares, send the serial number from the valve nameplate together with the valve type, size, pressure class, trim and actuator type and size. Emerson keeps the build record behind the serial number, so plug, seat ring, cage, packing and diaphragm kits can be matched without guesswork. For a FIELDVUE or regulator, send the full model and type number and the mounting details. For a new valve add the process data: fluid, flow range, inlet and outlet pressure, temperature, leakage class, fail position, air supply and signal.

Facts checked against Emerson Fisher product information and published company histories, October 2026.

Browse Fisher products by category: Control Valves, Valve Actuator, Valve Positioner, Regulators, Level Transmitter.

FAQ

Questions about the Fisher 3582 and 3582i Pneumatic and

Answers from our engineering team on installation, compatibility and integration.

01What is the difference between the Fisher 3582 and 3582i?

The 3582 is a pneumatic positioner taking a 3 to 15 or 6 to 30 psig signal. The 3582i has a 582i electro-pneumatic converter fitted and accepts a 4 to 20 mA DC signal. The 3582i is not approved for natural gas supply.

02What stem travel does the 3582 support?

Maximum valve stem travel is 105 mm (4.125 in.), adjustable to lesser travel with the standard input signal. It is for diaphragm-actuated sliding-stem valves.

03Can a 3582 be upgraded to 4 to 20 mA?

Yes. A 582i converter can replace the gauge block to make a 3582i, but the bulletin warns that field upgrades may require changing the mounting and the input signal range, so plan with the supplier.

04What accuracy does the 3582 offer?

Independent linearity is plus or minus 1 percent of output span and hysteresis 0.5 percent for the 3582. The 3582i figures are plus or minus 2 percent and 0.6 percent.

05Is there a nuclear or high-temperature version?

The 3582NS uses EPDM parts for nuclear service with a limit of 82 degrees C, and the 3582A and 3582C are available in a high-temperature construction up to 104 degrees C without gauges.