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Fisher™ A11 High Performance Butterfly Valve
The Fisher A11 valve is a reliable, high performance Butterfly valve for both throttling and on/off applications.
Available in either a wafer or single-flange design, it maintains tight shutoff, and can be specified for a wide range of pressure and temperature conditions, including cryogenic applications.
Fisher™ A11 High Performance Butterfly Valve


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, Cryogenic
Power Source
Electric, Hydraulic, Pneumatic, Electro-Hydraulic
Pressure Class
Process Connection Type
Flanged, Single Flanged, Double Flanged, Lugged, Wafer
Seat / Seal Type
Metal, Soft
Shutoff Class
Class IV (FCI 70-2), Class V (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, NPS 30, NPS 36, Custom inlet/outlet, Up to NPS 72
Valve Size Standard
Other Configurations
Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.


  • Choose from square, keyed, or splined shaft connections.
  • The pressure-assisted seal design provides tight shutoff.
  • 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 of either flat sheet or spiral-wound line flange gaskets.
  • A feature of the valve design is that the torque necessary to open and close the valve is the same, regardless of the direction in which the differential pressure is applied.
  • Interchangeability of all parts, including shafts and disks, simplifies service and reduces maintenance costs.