Mud saver valve with magnetic latching

Details Mud saver valve with magnetic latching Mud saver valve with magnetic latching

2007-07-09

2010-06-29

Hepperle, Stephen (Department: 3753)

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

C166S319000, C166S321000, C166S322000, C251S065000, C137S493900

Reexamination Certificate

active

07743787

ABSTRACT:
A mud saver valve for retaining drilling fluid in the Kelly of a rotary drilling rig for insertion into a Kelly sub with an enlarged opening inside having a valve and hollow piston closing the flow in a first position and having flow through when the hollow piston is moved by flow against a spring to an open position compressing a spring to stack height, the spring being magnetized to provide magnetic latching to assist in holding the hollow piston in the open position at flow rates lower than it would otherwise be held open.

REFERENCES:
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patent: 4625755 (1986-12-01), Reddoch
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patent: 4899837 (1990-02-01), Baugh
patent: 5513395 (1996-05-01), Chlebek et al.
patent: 5584465 (1996-12-01), Ochsenreiter
patent: 6073904 (2000-06-01), Diller et al.
patent: 6460620 (2002-10-01), LaFleur

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