Kelly valve

Details Kelly valve Kelly valve

1979-07-02

1981-04-21

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

166321, 175242, 251 56, 251 58, 251229, E21B 4312

Patent

active

042626935

ABSTRACT:
A valve adapted for installation at the lower end of a drilling kelly for closing the bore of the kelly when adding a section of drill pipe so that the mud content of the kelly is not discharged onto the derrick floor; the valve also being adapted with minimum change in parts, to be inverted and installed at the upper end of the kelly to serve as a safety valve, providing blow out protection.

REFERENCES:
patent: 2322064 (1943-06-01), Seweli
patent: 3035808 (1962-05-01), Knox
patent: 3583442 (1971-06-01), Dollison
patent: 3915228 (1975-10-01), Giebeler
patent: 3993136 (1976-11-01), Mott
patent: 4050512 (1977-09-01), Giebeler

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