Butterfly valve
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United States of America Patent
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Jun 18, 2019
Grant Date -
Nov 16, 2017
app pub date -
May 10, 2017
filing date -
May 13, 2016
priority date (Note) -
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Abstract
A butterfly valve includes a valve element that turns with a shaft to control open/closed states of a passage or adjust an opening degree of the passage. The valve element includes a plate and an elastic member provided along an outer circumference of the plate. The elastic member has seal parts that touch and leave an inner surface of the passage to close and open the passage. The plate has specific shapes on both sides with respect to an axis of the shaft, the specific shapes narrowing gaps between the plate and the inner surface on lower-pressure sides of seal centers of the seal parts in a valve closed state.
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