Mud saver valve

Details Mud saver valve Mud saver valve

1981-02-23

1982-12-21

Nilson, Robert G.

Fluid handling

Destructible or deformable element controlled

Destructible element

1374932, 1375155, 166317, 166325, 175218, E21B 700

Patent

active

043644074

ABSTRACT:
Disclosed is a mud saver valve which includes a tubular body connectable between a kelly and a drill string. An annular seat ring having a central opening is mounted within the body. A piston is axially movably mounted within the body for engagement with the seat ring. The piston includes a bore substantially coaxially aligned with the central opening and a flange that extends radially outwardly from the piston to slidingly engage the interior of the body. The piston has a plurality of ports above the piston to communicate the exterior of the piston with the bore. A plug is removably mounted in the piston. The plug includes a shear ring removably inserted in the bore and a spear axially movably mounted in the shear ring. The plug is movable between a first position wherein the spear sealingly engages the shear ring in a second position that allows fluid to flow upwardly between the spear and the shear ring. A spring is provided to urge the piston into engagement with the seat ring.

REFERENCES:
patent: 2673062 (1954-03-01), Cornelius
patent: 3331385 (1967-07-01), Taylor
patent: 3698411 (1972-10-01), Garrett
patent: 3738436 (1973-06-01), Litchfield
patent: 3965980 (1976-06-01), Williamson
patent: 3967679 (1976-07-01), Lihjestrand
patent: 4128108 (1978-12-01), Parker

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