Mud saver valve

Details Mud saver valve Mud saver valve

1986-07-23

1988-10-25

Novosad, Stephen J.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With valve

137493, 137508, 166325, E21B 2110

Patent

active

047796880

ABSTRACT:
A mud valve assembly with a valve means with a first sealing surface and a piston means with a second sealing surface which seals against the first sealing surface such that the piston and the first seal surface move downward in response to pressure from above which exceeds a predetermined pressure level and the valve means and the second sealing surface move upwards in response to pressure from below the valve assembly; and the valve means with the second sealing surface can be retrieved from the bore of the drill pipe and reinstalled into the bore of the drill pipe without removing the mud valve assembly from the drill pipe.

REFERENCES:
patent: 3698426 (1972-10-01), Litchfield et al.
patent: 3750749 (1973-08-01), Giroux
patent: 4128108 (1978-12-01), Parker et al.
patent: 4248264 (1981-02-01), Handsell et al.
patent: 4364407 (1982-12-01), Hillard
patent: 4625755 (1986-12-01), Reddoch

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