High pressure automatic kelly valve

Details High pressure automatic kelly valve High pressure automatic kelly valve

1989-09-22

1990-11-13

Neuder, William P.

Wells

Automatic

137493, 251 5, 166326, E21B 3402

Patent

active

049695134

ABSTRACT:
A mud saver valve for automatically closing to prevent loss and spilling of drilling mud. The valve contains a diaphragm, rigid backup means and diaphragm support means so that the valve can be used in high pressure wells.

REFERENCES:
patent: 3494588 (1970-02-01), Kisling, III
patent: 3552712 (1971-01-01), Whitlock
patent: 3566964 (1971-03-01), Livingston
patent: 3717203 (1973-02-01), Kirkpatrick et al.
patent: 3955594 (1976-05-01), Snow
patent: 4349204 (1982-09-01), Malone
patent: 4494345 (1985-01-01), Peterson
patent: 4628996 (1986-12-01), Arnold
patent: 4768590 (1988-09-01), Sanford et al.
patent: 4790344 (1988-12-01), Chauvier et al.
patent: 4832120 (1989-05-01), Coronado

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