Mud saver valve

Details Mud saver valve Mud saver valve

2006-05-23

2006-05-23

Bagnell, David (Department: 3672)

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With valve

C175S317000, C166S322000, C166S325000, C137S327000

Reexamination Certificate

active

07048079

ABSTRACT:
A three-part sub-assembly comprising a wire line retrievable spear. The spear having two fluid chambers. A diverter valve having a truncated, inverted cone valve seat is preferably threaded into the interior of the spear. A diverter valve stem, having back-to-back cones is located within the interior of the spear/diverter valve combination, with one of the cones having a linear extension which prevents the first cone from completely seating against the valve seat within the interior of the spear. The spear/diverter valve assembly and a spring-loaded piston is placed within the interior of the cylinder and utilizes an adjustable ring within the interior of the cylinder as an adjustment for varying mud weights.

REFERENCES:
patent: 4364407 (1982-12-01), Hilliard
patent: 4625755 (1986-12-01), Reddoch
patent: 4658905 (1987-04-01), Burge
patent: 4962819 (1990-10-01), Bailey et al.
patent: 5425397 (1995-06-01), Mackal
patent: 5499745 (1996-03-01), Derian et al.
patent: 5598974 (1997-02-01), Lewis et al.
patent: 6554022 (2003-04-01), Wakeman

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