Mud saver valve
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United States of America Patent
Stats
-
Feb 13, 1990
Issued Date -
N/A
app pub date -
Dec 4, 1987
filing date -
Jul 23, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mud valve assembly is disclosed having a valve member with a first sealing surface and a piston member with a second sealing surface which seals against the first sealing surface such that the piston and the first sealing surface move downward in response to pressure from above which exceeds a predetermined pressure level and the valve member and the second sealing surface move upward in response to pressure from below the valve assembly. The valve member with the second sealing surface can be retrieved from the bore of the drill pipe and reinstalled into the bore of the drill pipe without removing the mud valve assembly from the drill pipe.
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Family
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Cited Art Landscape
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