Fluid handling – With liquid valves or liquid trap seals – Liquid seal in liquid flow line; flow liquid forms seal
Patent
1975-10-31
1977-09-06
Schwadron, Martin P.
Fluid handling
With liquid valves or liquid trap seals
Liquid seal in liquid flow line; flow liquid forms seal
13724723, 137449, 1375195, 210123, 210131, F16K 900
Patent
active
040461610
ABSTRACT:
A non-return valve comprising: a pipe for waste waters having a passageway for draining the waters in a downstream direction, a circular seat having a given diameter transversely disposed in said pipe and a housing opening into the passageway directly downstream and laterally with respect to the seat. The housing has an upper wall provided with a guiding strip transversely disposed with respect to the pipe and leaning in the upstream direction. A shutting ball, having a specific gravity lower than the specific gravity of the sullage and a diameter larger than the diameter of the seat is connected with the guiding strip so that the shutting ball can be brought to seat on the seat by floating on the waters in the case of an inopportune upstream back flow and be held into the housing when the waters are flowing in the normal direction.
REFERENCES:
patent: 201758 (1878-03-01), Downey
patent: 1318545 (1919-10-01), Dehn
patent: 1700636 (1929-01-01), Kuhn
patent: 2616512 (1952-11-01), Coon
patent: 2638308 (1953-05-01), Kell
patent: 2770314 (1956-11-01), Powell
Francois Francis B.
Robic Raymond A.
Schwadron Martin P.
Schwartz Arthur
Walton G. L.
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