Fisher A31D Valve Butterfly Valve – Rotary Valves

Product Overview

Fisher A31D Valve is a high performance butterfly valve with a double flange design featuring either a splined drive shaft or a keyed drive shaft for either throttling or on/off service in process industries.

The A31D valve is available with face-to-face dimensions conforming to ISO 5752 Butterfly Valve Short (CL150) or Long (CL300) Series.

The A31D valve provides outstanding performance under extreme pressure and temperature conditions.

Fisher A31A is available in NPS 14 through 24, CL 150 and CL 300 and is suitable for most industry applications thanks to having a wafer or lugged body with a variety of seals. The Cryogenic version of this valve is available in NPS 3 through 24.

Fisher A31D Valve Butterfly Valve – Product Features

• Excellent Shutoff Integrity – pressure-assisted seal design provides tight shutoff and permits the use of smaller actuators in applications requiring full ASME B16.34 shutoff capabilities
• True Bi-directional Shutoff Performance – 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
• Safety – shaft-blowout protection is designed into the A31D valve. For NPS 3 through 12 valves, the packing follower and an anti-blowout follower hold an anti-blowout gland securely around the valve shaft. Under the anti-blowout gland, a formed wire ring around the shaft completes the protection design. For NPS 14 through 24 valves, the anti-blowout gland fits securely over the valve shaft which has been turned down to form a circumferential shoulder that contacts the anti-blowout gland
• Excellent Emissions Capabilities– optional ENVIRO-SEAL™ packing system is designed with improved sealing, guiding, and loading force transmission. The ENVIRO-SEAL packing system can control emissions to below the EPA (Environmental Protection Agency) limit of 100 ppm (parts per million) for valves
• Shaft Versatility – valve will meet your actuator needs with a choice of splined or keyed shaft connections
• Sour Service Capability – trim and bolting materials are available for applications involving sour liquids and gases. These constructions comply with NACE MR0175-2002, MR0103, and MR0175/ISO 15156
• Reliable Flange Gasketing Surface – seal retainer screws are located so there is no interference with the sealing function of either flat sheet or spiral wound line flange gaskets
• Easy Installation – valve body self-centers on the line flange bolts as a fast, accurate means of centering the valve in the pipeline

PRODUCT Specification

See how Fisher Control Valves provide safe, efficient and intuitive flow control.

Installing Fisher A31D Butterfly Valve

Fisher A31D butterfly valves should be installed with the flow into the shaft side of the disk (retaining ring downstream from the high pressure side of the valve). The standard soft seal offers ANSI/FCI 70-2 Class VI, bidirectional shutoff.

Fisher Valves Typical Industries Include Power, Petrochem, Oil & Gas