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Fisher A31A Cryogenic High Performance Butterfly Valve

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Pekka Immonen
Key Account Manager
Mob. 045 168 8355

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

The Fisher™ A31A cryogenic high performance butterfly valve is designed for extreme temperature, cryogenic services and features a valve body extension which positions the packing system and the actuator away from the extreme temperatures. The valve also features a metal NOVEX seal providing tight shutoff, low operating torques, and the rugged durability needed for cryogenic service.

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Certifications	PED, CRN, Fugitive Emission
Critical Service	General Service
Flow Characteristics	Linear
Material	Carbon Steel, Stainless, Alloy
Operating Temperature	Cryogenic, Standard Temperature, High Temperature
Power Source	Electric, Hydraulic, Pneumatic, Lever, Gear, Electro-Hydraulic
Pressure Class	ASME
Process Connection Type	Flanged, Single Flanged, Double Flanged, Lugged, Wafer
Seat / Seal Type	Metal, Soft
Shutoff Class	Class VI (FCI 70-2)
Standards	B16.34
Stem	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
Valve Size Standard	NPS

Developed as a valve/actuator packing with a double D drive shaft to allow easy, direct mounting to a rack and pinion actuator, eliminating the need for external coupling systems.
Concentric rotation ensures that the valve disk remains in the closed position, even in the event of line pressure surges or actuator failure.
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.
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.