Drill string shutoff valve

Details Drill string shutoff valve Drill string shutoff valve

2005-07-19

2005-07-19

Walker, Zakiya (Department: 3672)

Boring or penetrating the earth

Boring without earth removal

Fluid passage to exterior of drive point

C175S318000, C175S324000, C166S334100

Reexamination Certificate

active

06918452

ABSTRACT:
A valve assembly connects into a drill string for opening and closing the inner passage within the drill string. The valve member moves between the open and closed positions in response to axial movement of the drill string. The valve member has an upper portion and a lower portion. A valve member and valve sleeve are located within an inner passage. Lifting the drill string causes the upper portion to move upward relative to the lower portion, bringing along with it the valve member, while the valve sleeve remains stationary with the lower portion, opening the valve.

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