Abrading – Machine – Sandblast
Reexamination Certificate
2007-11-27
2007-11-27
Nguyen, Dung Van (Department: 3723)
Abrading
Machine
Sandblast
C451S099000
Reexamination Certificate
active
11504407
ABSTRACT:
The present invention is related to valves for the controlling the flow of media. For example, the valves of the present invention may control the flow of solid media into a fluid stream. More, specifically, the valves of the present invention may be used to control the flow of a blasting media into an air stream as part of a blasting apparatus for treatment of a surface. The valve body houses a sleeve for accepting a plunger for opening and closing a media opening in the valve. The sleeve includes a hardened liner and a softer outer jacket. The plunger engaging portion of the jacket is of a larger diameter than the plunger engaging portion of the liner to create a gap between the plunger and the soft jacket portion of the sleeve.
REFERENCES:
patent: 5401205 (1995-03-01), Shank, Jr.
patent: 5421767 (1995-06-01), Spears et al.
patent: 5542873 (1996-08-01), Shank, Jr.
patent: 5810045 (1998-09-01), Evans
patent: 6607175 (2003-08-01), Nguyen et al.
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