Self closing mixing cartridge for single handle cartridge...

Fluid handling – Systems – Multi-way valve unit

Reexamination Certificate

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Details

C137S625400, C251S324000

Reexamination Certificate

active

07108011

ABSTRACT:
A self closing cartridge for a single handle faucet includes a casing having a piston therein which is held in a normally closed, up position by water pressure. There are seal members positioned to form a seal between the sleeve and the casing. Further, a spring is incorporated to assist the hydraulic self closure of the cartridge by raising the piston to a normally closed position under low water pressure conditions and to mechanically shear and digest any deposited matter in the area of the spring.

REFERENCES:
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patent: 3958792 (1976-05-01), Barkelew
patent: 4165857 (1979-08-01), Morris et al.
patent: 4241759 (1980-12-01), Billeter
patent: 4457452 (1984-07-01), Symmons
patent: 4768553 (1988-09-01), Marx
patent: 4784368 (1988-11-01), Koch et al.
patent: 4973025 (1990-11-01), Iqbal
patent: 5103857 (1992-04-01), Kuhn et al.
patent: 5526845 (1996-06-01), Manos
patent: 5927328 (1999-07-01), Nelson et al.
patent: 2004/0144944 (2004-07-01), Roethel et al.

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