How Posi-flate Butterfly Valves Work
Closed, unsealed
As the valve rotates into the closed position, the disc makes only casual contact with the seat, reducing friction, wear and torque requirements.
Closed, sealed
After the valve is closed, the seat inflates against the disc providing more sealing surface and an even pressure distribution against the disc.
Open, unsealed
Before the valve opens, the seat is first deflated. The disc is then free to rotate to the open position.
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12/22/2009
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