Composite-action butterfly valve
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United States of America Patent
Stats
-
Sep 28, 1999
Grant Date -
N/A
app pub date -
Aug 12, 1998
filing date -
Nov 13, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the valve, a valve element (4) is supported on a valve element operating shaft (7) by a fixed-length support means (5) and a variable-length support means (6) connected to its back surface opposite the front surface facing a valve seat (3). The fixed-length support means (5) has an arm (5a) of a fixed length pivotally connected to the valve element (4) and mounted for turning on the valve element operating shaft (7), and the variable-length support means (6) of a variable length comprises an elastic member (6a) acting to reduce the distance between the opposite ends of the variable-length support means (6), a transmission mechanism for converting the torque of the valve element operating shaft (7) into a force to increase the distance between the opposite ends of the variable-length support means (6), and a stopper (6f) for limiting the range of variation of the distance between the opposite ends of the variable-length support means (6). An external torque is applied to the valve element operating shaft (7) to operate the valve element (4).
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Family
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Cited Art Landscape
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