Fluid handling – With means for separating solid material from the fluid – Planar strainer normal to flow path
Reexamination Certificate
1999-07-14
2001-02-06
Rivell, John (Department: 3753)
Fluid handling
With means for separating solid material from the fluid
Planar strainer normal to flow path
C251S040000
Reexamination Certificate
active
06182689
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to toilet room flush valves and more particularly to such flush valves in which a flexible diaphragm functions to separate the flush valve inlet and outlet. Conventionally, such diaphragm type flush valves have a pressure chamber located above the diaphragm to maintain the diaphragm on its seat to provide valve closure. There is a bypass orifice in the diaphragm which connects the flush valve inlet to the pressure chamber to provide the water necessary to move the diaphragm to the valve closing position. Frequently, the water system supplying flush valves for use in toilet rooms may contain particles which will clog the bypass orifice with the result that the valve becomes non-functional. The present invention provides a peripheral screen located at the upstream side of the valve orifice to filter particles from passing to the orifice and thereby preventing the valve from malfunctioning. Preferably the mesh size of the screen is such that no particle can pass through the screen unless it is smaller in diameter than the diameter of the bypass orifice.
SUMMARY OF THE INVENTION
The present invention relates to diaphragm type toilet room flush valves and more particularly to an improved filter for protecting the bypass orifice in such a valve.
A primary purpose of the invention is to provide a simply constructed, reliable, filter located at the upstream side of the bypass orifice for a diaphragm type flush valve.
Another purpose is to provide a filter of the type described which includes a peripherally extending screen, mounted in a screen carrier with the carrier being captured at its inner peripheral edge to the diaphragm assembly and at its outer peripheral edge to the flush valve body.
Another purpose is a flush valve with diaphragm assembly including a filter screen as described in which the size of the screen openings is smaller than the opening in the bypass orifice.
Other purposes will appear in the ensuing specification, drawings and claims.
REFERENCES:
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patent: 2916251 (1959-12-01), Butts
patent: 3279742 (1966-10-01), Billeter
patent: 3911796 (1975-10-01), Hull et al.
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patent: 4327891 (1982-05-01), Allen et al.
patent: 5213305 (1993-05-01), Whiteside et al.
patent: 5332192 (1994-07-01), Whiteside
patent: 5887848 (1999-03-01), Wilson
patent: 5967182 (1999-10-01), Wilson
Hall David C.
Lauer John W.
McEachran, Jambor, Keating, Bock & Kurtz
Rivell John
Sloan Valve Company
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