Method of making a subsurface well safety valve

Details Method of making a subsurface well safety valve Method of making a subsurface well safety valve

1989-12-11

1991-01-08

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

29890128, 51290, 219 6912, B23H 100, B23H 702, B23H 900, B24B 100

Patent

active

049838032

ABSTRACT:
A subsurface safety valve is made by the steps of coating a hard seat in the inside surface of a circular tubular member, honing the inside of the tubular member, drilling a hole in a circular plane perpendicular to the axis of the tubular member to form hinge holes in the future cut out valve closure members, and then cutting hinges out of circular sectors of the tubular member. Preferably the cutting is performed using a wire electrode of a wire cutting electric discharge machine, although cutting may be performed by a mill or a chemical machine.

REFERENCES:
patent: 2162578 (1939-06-01), Hacker
patent: 2295111 (1942-09-01), Hemmings
patent: 2381572 (1945-08-01), Caldwell
patent: 3052013 (1962-09-01), Kane
patent: 3271845 (1966-09-01), Breher
patent: 3833988 (1974-09-01), Tobias
patent: 4531587 (1985-07-01), Fineberg
patent: 4596501 (1986-06-01), Wu

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