POSI-SEAL Type A11 High Performance Butterfly Valve
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The Type A11 valve is available in either a flangeless (wafer) or a single-flange (lugged) style design. The valve combines with a variety of handlevers, handwheels, or pneumatic piston actuators to make the Type A11 a reliable, high-performance butterfly valve for a variety of on-off applications in the various process industries.
The Type A11 valve is supplied with one of several patented pressure-assisted dynamic seals that can be used in a variety of demanding applications. With the appropriate seal selection and materials of construction, the Type A11 valve can provide excellent shutoff against the full class pressures.
- Economical Tight Shutoff — The patented 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 enables the valve disk to remain in the closed position in spite of line pressure surges or actuator failure.
- True Bidirectional Shutoff Performance — A feature of the valve design is that the torque necessary to open and close the valve is the same regardless of the direction in which the differential pressure is applied.