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U.S. Department of Energy
Office of Scientific and Technical Information

Mud saver valve with increased flow check valve

Patent ·
OSTI ID:6498701

This patent describes a closure plug. It is mounted in a mud saver valve for retaining fluids within a drill string. The mud saver valve includes a tubular body adapted to be disposed within the drill string and an axially movable piston having a fluid passageway and disposed within the tubular body.

Assignee:
Drilex Systems, Inc., Houston, TX (USA)
Patent Number(s):
US 4955949; A
Application Number:
PPN: US s 7-305319
OSTI ID:
6498701
Country of Publication:
United States
Language:
English

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