Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1978-10-16
1981-06-02
Cline, William R.
Fluid handling
Line condition change responsive valves
Direct response valves
166325, F16K 1506, F16K 2110
Patent
active
042705690
ABSTRACT:
A downhole float valve is normally closed by a spring or other means of applying axial pressure until sufficient pressure of drilling fluid from the surface opens the valve. The valve stem includes a dashpot type housing secured thereto and moving within a fluid filled cylinder. When the valve opens, the movement is controlled by a one-way valve in the housing giving a relatively rapid opening. When pressure of the drilling fluid from the surface is removed, the pressure on the underside of the valve typically assisted by the spring, closes the valve. An adjustable bleed passage in the housing delays this closing for a pre-determined time thus allowing the pressure on the underside of the valve to balance with the pressure on the other side of the valve, but preventing an hydraulic lock or an hydraulic "stuck" situation from occurring.
REFERENCES:
patent: 956789 (1910-05-01), Allan
patent: 1379092 (1921-05-01), Fraccascia et al.
patent: 2142410 (1939-01-01), Quick
patent: 2927604 (1960-03-01), Johnson
patent: 3698411 (1972-10-01), Garrett
patent: 3698426 (1972-10-01), Litchfield et al.
Rachuk Ronald
Reay Robert G.
Ade Stanley G.
Christensen Inc.
Cline William R.
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