Ball valve

Details Ball valve Ball valve

2000-11-16

2001-10-16

Shaver, Kevin (Department: 3754)

Valves and valve actuation

Rotary valves

Ball valve

C251S315140, C137S557000

Reexamination Certificate

active

06302373

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a valve, and more particularly to a ball valve.
2. Description of Related Art
As shown in
FIG. 1
, a prior art ball valve
40
is provided in the interior of a tubular body
41
thereof with a threaded portion
42
, a rotary shaft member
1
, a spherical body
2
, a washer
3
, and an annular locking member
43
. The prior art ball valve
40
is limited in design because it can only be joined with the pipeline in a limited direction, and because it cannot be easily maintained or repaired.
As shown in
FIG. 2
, another prior art ball valve
50
has a tubular body
51
which is provided in the interior with a threaded port
52
, a rotary shaft member
1
, a spherical body
2
, a washer
3
, and a threaded tubular member
53
. This prior art ball valve
50
cannot be easily maintained or repaired.
As shown in
FIG. 3
, a prior art French-type ball valve
60
has a main tubular body
61
which is provided in the interior thereof with a rotary shaft member
1
, a spherical body
2
, a washer
3
, and a secondary tubular body
62
. The prior art ball valve
60
cannot be easily maintained or replaced.
As shown in
FIG. 4
, a prior art ball valve
70
has a main valve body
71
, which is joined with the pipeline by means of two secondary valve tubes
72
. The prior art
70
is relatively complicated in construction and is therefore not cost-effective.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a ball valve which is free of the deficiencies of the prior art ball valves described above.
The features, functions, and advantages of the present invention will be readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.


REFERENCES:
patent: 1577900 (1926-03-01), Evans
patent: 3333813 (1967-08-01), Rabe
patent: 3985334 (1976-10-01), Domyan
patent: 4319734 (1982-03-01), Acar
patent: 4423749 (1984-01-01), Schmitt
patent: 4708158 (1987-11-01), Akamatsu
patent: 4718444 (1988-01-01), Boelte
patent: 4976403 (1990-12-01), Bramblet
patent: 5036883 (1991-08-01), McHugh
patent: 5152503 (1992-10-01), Conway
patent: 5313976 (1994-05-01), Beasley
patent: 5551479 (1996-09-01), Graves
patent: 5562116 (1996-10-01), Henwood
patent: 5873389 (1999-02-01), Cheng
patent: 5927685 (1999-07-01), Gosling
patent: 5941266 (1999-08-01), Henwood

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