Ball valve element and method of manufacturing a ball valve elem

Details Ball valve element and method of manufacturing a ball valve elem Ball valve element and method of manufacturing a ball valve elem

1996-08-01

1999-11-23

Fox, John

Valves and valve actuation

Rotary valves

Ball valve

25131516, F16K 506

Patent

active

059885904

ABSTRACT:
A method of manufacturing a ball valve element includes a recess forming step in which a press die is used to form two stem recesses in an outer peripheral surface of pipe material cut to a prescribed size, the stem recesses being formed at positions that are symmetrical with respect to the center axis of the pipe material, and a ball-shaped element forming step in which the pipe material in which the stem recesses have been formed is placed in a split die having substantially spherical forming surfaces, with the openings in the pipe material facing the spherical forming surfaces of the split die, and pressure is exerted by the split die to uniformly and symmetrically deform the pipe material into a sphere.

REFERENCES:
patent: 3246873 (1966-04-01), Johnson
patent: 3501128 (1970-03-01), Pool
patent: 3737145 (1973-06-01), Heller et al.
patent: 4568059 (1986-02-01), Kawase et al.
patent: 4678161 (1987-07-01), Bando et al.

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