A31D | Fisher™ A31D Double-Flange Butterfly Valve | Fisher
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Brand: FisherSKU: A31D
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A31D | Fisher™ A31D Double-Flange Butterfly Valve | Fisher

Fisher | A31D
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Overview

Details for A31D

Fisher™ A31D Double-Flange Butterfly Valve

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.

  • 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

Item Number A31D
Brand Fisher
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
Pressure Class ASME
Process Connection Type Double Flanged
Series Fisher™ A31D Double-Flange Butterfly Valve
Shutoff Class Class VI (FCI 70-2); MSS SP-61
Type Control Valve
Valve Size Standard NPS
Valve Size NPS 3; NPS 4; NPS 6; NPS 8; NPS 10; NPS 12

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