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Fisher™ 8590 High Performance Butterfly Valve
The Fisher 8590 high performance Butterfly valve maintains tight shutoff and can be specified for a wide range of pressure and temperature conditions.
The 8590 valve is available in a lugged body design. A splined shaft can combine with a variety of spring-and-diaphragm or pneumatic piston actuators and a square or keyed shaft can combine with a variety of handlevers, handwheels, or pneumatic piston diaphragm actuators.
Fisher™ 8590 High Performance Butterfly Valve


SIL capable, PED, CRN, Fugitive Emission, NACE, ATEX, CUTR, Fire Safe
Critical Service
General Service
Flow Characteristics
Carbon Steel, Stainless, Alloy
Operating Temperature
Standard Temperature, High Temperature
Power Source
Electric, Hydraulic, Pneumatic, Lever, Gear, Electro-Hydraulic
Pressure Class
Process Connection Type
Flanged, Single Flanged, Double Flanged, Lugged
Seat / Seal Type
Metal, Soft
Shutoff Class
Class IV (FCI 70-2), Class VI (FCI 70-2)
Live Loaded, Adjustable Packing
Valve Size
NPS 3, NPS 4, NPS 6, NPS 8, NPS 10, NPS 12, NPS 14, NPS 16, NPS 18, NPS 20, NPS 24
Valve Size Standard
Other Configurations
Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.


  • This valve will meet your actuator needs with a choice of splined, square, or keyed shaft connections.
  • The pressure-assisted seal design provides tight shutoff and permits the use of smaller, less expensive actuators in applications requiring full ASME B16.34 shutoff capabilities.
  • The optional ENVIRO-SEAL™ packing systems are designed with very smooth shaft surfaces and live-loading to provide improved sealing, guiding, and loading force transmission.
  • Trim and bolting materials are available for applications involving sour liquids and gases.
  • The valve body self-centers on the line flange bolts as a fast, accurate means of centering the valve in the pipeline.
  • Seal retainer screws are located so there is no interference with the sealing function.
  • The torque necessary to open and close the valves is the same, regardless of the direction in which the differential pressure is applied.