Butterfly valve having improved sealing characteristics
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United States of America Patent
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Jun 2, 1992
Grant Date -
N/A
app pub date -
May 16, 1991
filing date -
May 16, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A fully sealing butterfly valve throttles flow rates through a flow channel and completely ceases flow. A throttle plate rotates into a close position and then moves axially to seat against a seal. The axial movement directly corresponds to rotation of an actuator shaft to improve valve control for the entire range of throttle plate movement from a full open position to a seal position. Additionally, the present butterfly valve employs a self-centering throttle plate adapted to float within the valve central bore. The throttle plate adjusts its positioning about an annular seal to achieve an effective seal entirely around its circumference.
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