Kelly valve

Details Kelly valve Kelly valve

1978-12-18

1981-12-01

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

175218, 175318, 251 5, F16K 1514

Patent

active

043031005

ABSTRACT:
An improved kelly valve of a type wherein a flexible inner valve body closes the valve passageway responsive to the pressure of a gaseous control fluid contained within a sealed chamber and opens the passageway responsive to exterior pressure of drilling fluid or of tools being passed through the valve. The improvements enhance the operating life of the flexible member and simplify the valve structure and assembly and disassembly procedures.

REFERENCES:
patent: 1861726 (1932-06-01), Trout
patent: 2247363 (1941-07-01), Dunn
patent: 3239100 (1966-03-01), Peterson
patent: 3292718 (1966-12-01), Stone
patent: 3349856 (1967-10-01), Richardson
patent: 3364533 (1968-01-01), Sibrava
patent: 3367422 (1968-02-01), Sims
patent: 3481610 (1969-12-01), Slator
patent: 3640354 (1972-02-01), Rassieur
patent: 3703213 (1972-11-01), Kammerer
patent: 3982723 (1976-09-01), Ford

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