Ball valve

Details Ball valve Ball valve

2002-03-11

2002-12-03

Yuen, Henry C. (Department: 3754)

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

C251S310000, C251S315110, C251S180000

Reexamination Certificate

active

06488261

ABSTRACT:

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
REFERENCE TO MICROFICHE APPENDIX
Not applicable.
FIELD OF THE INVENTION
The present invention relates generally to a valve, and more particularly to a ball valve.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, a prior art ball valve
60
includes a main body
61
and an auxiliary body
62
. The main body
61
is provided in the interior with a rotary shaft
1
, a spherical body
2
, and two washers
3
. The prior art ball valve
60
is defective in design because the auxiliary body
62
and the main body
61
must be separated to facilitate the repairing or maintaining of the ball valve
60
. The separation of the auxiliary body
62
from the main body
61
is a time-consuming chore. In addition, the washers
3
are susceptible to wear and deformation due to the mechanical friction between the washers
3
and the spherical body
2
. The wear or deformation of the washers
3
can result in leakage of the prior art ball valve
60
.
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 valve described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is achieved by a ball valve comprising a main body, a cap, a disk spring, a driven member, and a spherical body. The disk spring and the driven member are disposed in the cap such that the driven member is urged by the disk spring to displace, thereby causing two PTFE washers to come in contact with the spherical body.
The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.


REFERENCES:
patent: 2558260 (1951-06-01), Maky
patent: 3228652 (1966-01-01), Antrim
patent: 3266769 (1966-08-01), Shand
patent: 3387815 (1968-06-01), Richards
patent: 3838844 (1974-10-01), Arn
patent: 4428561 (1984-01-01), Thompson
patent: 4718444 (1988-01-01), Boelte
patent: 4809949 (1989-03-01), Rakieski
patent: 5562116 (1996-10-01), Henwood

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