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Fisher Double Flange Butterfly Valve, A31D

A31D Double Flange Butterfly Valve

Brand: Fisher
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The Fisher A31D is a double-flange, high performance butterfly valve featuring either a splined drive shaft or a keyed drive shaft. 

The A31D is used in throttling or on/off service and is available in NPS 3 through 12, CL150 and CL300.
Features
  • The pressure-assisted seal design provides tight shutoff and permits the use of smaller actuators in applications requiring full ASME B16.34 shutoff capabilities.
  • The A31D valve design helps to ensure that the torque necessary to open and close the valve is the same, regardless of the direction in which the differential pressure is applied.
  • Shaft-blowout protection is designed into the A31D valve.
  • The optional ENVIRO-SEAL™ packing system is designed with improved sealing, guiding, and loading force transmission.
  • This valve will meet your actuator needs with a choice of splined or keyed shaft connections.
  • Trim and bolting materials are available for applications involving sour liquids and gases.
  • Seal retainer screws are located so there is no interference with the sealing function of either flat sheet or spiral-wound line flange gaskets.
  • The valve body self-centers on the line flange bolts as a fast, accurate means of centering the valve in the pipeline.

Specifications

Brand

Approvals & Certifications

  • PED, CRN, Fugitive Emission, NACE, ATEX, CUTR, Fire Safe

Critical Service

  • General Service

Flow Characteristics

  • Linear

Material

  • Carbon Steel, Stainless, Alloy

Operating Temperature

  • Standard Temperature, High Temperature

Other Configurations

  • Contact Your Local Emerson Business Partner or Sales Office to Learn About Additional Specifications or Options for This Product.

Pressure Class

  • ASME

Process Connection Type

  • Double Flanged

Shutoff Class

  • Class VI (FCI 70-2), MSS SP-61

Valve Size

  • NPS 3, NPS 4, NPS 6, NPS 8, NPS 10, NPS 12

Valve Size Standard

  • NPS

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