A31D | Fisher™ A31D Double-Flange Butterfly Valve | Fisher

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.