Low friction ball valve
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United States of America Patent
Stats
-
Mar 16, 1993
Issued Date -
N/A
app pub date -
Jun 30, 1992
filing date -
Oct 3, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A low friction ball valve used for instance in an automatic shutoff valve system. The valve mechanism includes a spring loaded ball valve normally latched in the open position which is unlatched and hence closes in one version by the contraction of a BioMetal.TM. wire which activates a torsion spring to rotate the ball valve. When the valve is open, the ball inside the valve rests on rollers so that the ball is held slightly away from the seal of the valve located in the valve body. Closing the valve causes the rollers to snap into detents in the ball, and the ball then comes into firm contact with the seal.
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