Valve system for drilling systems

Details Valve system for drilling systems Valve system for drilling systems

2010-04-27

2011-10-04

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

C091S436000, C091S437000

Reexamination Certificate

active

08028613

ABSTRACT:
A valve system includes a load holding valve, a feed balancing valve, and a fast feed differential valve. The load holding valve may be in fluid communication with the load holding valve. The fast feed differential valve is configured to move between an engaged state and a disengaged state. In the engaged state the fast feed differential valve fluidly couples a ring side of a feed cylinder, the load holding valve, and a piston side of the feed cylinder to allow fluid to flow from the ring side to the piston side.

REFERENCES:
patent: 4205591 (1980-06-01), Mickelson
patent: 5826486 (1998-10-01), Shimada
patent: 5996465 (1999-12-01), Morikawa et al.
patent: 2004/0221714 (2004-11-01), Bitter et al.
patent: 2005/0247188 (2005-11-01), Jeon
patent: 2009/0077957 (2009-03-01), Noble et al.
International Search Report dated Dec. 17, 2010 as issued in connection with corresponding PCT Application No. PCT/US2010/032736, filed on Apr. 28, 2010.

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