Fisher High Performance Butterfly Valve A31A

Manufacturer: Fisher

The Fisher A31A High Performance Butterfly Valve provides outstanding performance under extreme pressure and temperature conditions. The A31A valve maintains tight shutoff and is available in a fire-tested Version. The A31A valve is available as either a flangeless (wafer style) design or as a single-flange (lugged) design. A keyed drive shaft combines with a variety of handlevers, handwheels, or pneumatic piston diaphragm actuators to make the A31A a reliable, high-performance butterfly valve for a variety of on-off applications in the various process industries. The A31A valve can be supplied with one of several dynamic seals (figure 1) that can be used in a variety of demanding applications. With the appropriate seal selection and materials of construction, the pressure-assisted seal provides excellent shutoff against the full ASME class pressure range for the specific valve type.

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Features Model Document

Economical Tight Shutoff - The pressure-assisted seal design provides tight shutoff and permits the use of smaller, less expensive actuators in applications requiring full ASME B16.34 shutoff capabilities.
Excellent Shutoff Integrity - Concentric rotation helps to ensure that the valve disk remains in the closed position in spite of line pressure surges or actuator failure.
True Bi-directional Shutoff Performance - 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 A31A valve (figure 3). 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.

Mfr. Part No.	Description

Fisher High Performance Butterfly Valve A31A

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