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Fisher A31D Double-Flange Butterfly Valve

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Taneli Luhanko
Inside Sales Engineer
Phone. 0207 416 202
Mob. 040 757 4208

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.

Fisher HAPPI

Tekniset tiedot
Ominaisuudet

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
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

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.

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Fisher A31D Double-Flange Butterfly Valve

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