Fluid sprinkling – spraying – and diffusing – Unitary injection nozzle and pump or accumulator plunger
Reexamination Certificate
1999-08-02
2001-05-08
Morris, Lesley D. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Unitary injection nozzle and pump or accumulator plunger
C239S096000, C239S533900, C239S585100
Reexamination Certificate
active
06227459
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to valves having guided valve members, and more particularly to valves having valve members trapped between opposing valve seats.
BACKGROUND ART
A number of valves have been developed which include a valve member movably positioned in a valve body. In all of these previous valves, three components have been necessary to define the four essential valve surfaces and valve seats. In these valves, a valve member, which defined the two valve surfaces, was trapped between a first valve seat defined by the main valve body, and a second valve seat which was located by its contact with the main valve body, such as a press fit or a sleeve. For proper valve performance, all of these valve surface and valve seats must be concentrically aligned. Past valves which have had some success concentrically aligning these surfaces and seats have included the second seat on a seat component which remained radially in contact with the main valve body. While some machining tolerance of the various valve features must always exist, engineers are always looking for a way to improve the concentricity of these components.
The present invention is directed to overcoming one or more of the problems described above and to improving opposing valve surface/seat alignments.
SUMMARY OF THE INVENTION
A valve comprises a valve body that includes an upper valve seat and a bore wall that defines a bore. A seat component is at least partially positioned in the bore and includes a lower valve seat. The seat component is radially out of contact with the bore wall. The upper valve seat and the lower valve seat are concentrically coupled via a valve member which is movable between the upper valve seat and the lower valve seat.
REFERENCES:
patent: 3802626 (1974-04-01), Regnealt et al.
patent: 5218999 (1993-06-01), Tanimoto
patent: 5463996 (1995-11-01), Maley et al.
patent: 5626326 (1997-05-01), Goossens
patent: 5628293 (1997-05-01), Gibson
patent: 5673669 (1997-10-01), Maley et al.
patent: 5697342 (1997-12-01), Anderson et al.
patent: 5947380 (1999-09-01), Coldren et al.
patent: 5961052 (1999-10-01), Coldren et al.
patent: 6059203 (2000-05-01), Streicher et al.
Coldren Dana R.
Martin David E.
Caterpillar Inc.
Ganey Steven J.
Liell & McNeil
Morris Lesley D.
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