Flapper valve for use in downhole applications
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United States of America Patent
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Sep 7, 2010
Issued Date -
N/A
app pub date -
May 22, 2007
filing date -
Jun 24, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A downhole valve comprises a body defining a through bore and a valve member for location in the body and movable between an open position and a closed position. The valve has a first configuration in which the valve member is normally closed, and will hold a pressure differential in a first direction, and a second configuration in which the valve member is closed and will maintain a pressure differential in the first direction and also in an opposite second direction and a third configuration in which the valve member is locked in the open position until it is deliberately closed.
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