Kelly mud saver valve sub

Details Kelly mud saver valve sub Kelly mud saver valve sub

1984-08-07

1986-12-02

Schwadron, Martin P.

Fluid handling

With repair, tapping, assembly, or disassembly means

With disassembly tool engaging feature

1374932, 1374939, 13753331, 166325, E21B 2140

Patent

active

046257551

ABSTRACT:
A Kelly Mud Saver Valve Sub is provided having a tubular valve body with an annular seat fixed in the interior of the valve body. A tubular closure member is reciprocally mounted within the valve body, and is biased with a helical spring into a closing relationship with the annular seat. Unidirectional seals are provided around the closure member to form a chamber in which the spring is retained, the unidirectional seals permitting fluid only to leave the chamber but not enter it. Spacer rings are provided at the downhole end of the chamber to prevent downhole pressure from being communicated past the spacer rings. The closure member in the valve accordingly opens solidly under the force of hydraulic pressure since the pressure acts against a larger area of the uphole end of the closure member than of the downhole end. In especially preferred embodiments, the unidirectional seal around the uphole end of the closure member is carried by the walls of the valve body so that the body of the closure member is protected from the turbulent flow of drilling mud when the closure member is in an open position. The end of the closure member which seats against the annular seat can also be provided with a removable plate that selectively seals the end of the closure member which seats against the annular ring when the valve is in an open position. This plate can be selectively removed from the end of the closure member by exerting upward pressure against a spear on the plate to inwardly deform four depending legs which hold the plate within the closure member. The plate can easily be reinserted into the closure member by inwardly deforming the depending legs and pushing the plate downwardly into the closure member.

REFERENCES:
patent: 548834 (1895-10-01), Lafferty
patent: 2855952 (1958-10-01), Tausch et al.
patent: 2994280 (1961-08-01), Daffin
patent: 3965980 (1976-06-01), Williamson
patent: 3967679 (1976-07-01), Liljestrand
patent: 4128108 (1978-12-01), Parker et al.
patent: 4185655 (1980-01-01), Wilkes et al.
patent: 4364407 (1982-12-01), Hilliard

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