Anti-siphon device for sanitary appliance

Details Anti-siphon device for sanitary appliance Anti-siphon device for sanitary appliance

1993-01-21

1994-07-05

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

1375123, 137854, E03C 110

Patent

active

053258851

ABSTRACT:
A backflow preventing device located downstream of a water control member of a sanitary fitting comprises a casing defining a cavity which communicates with a water feeding pipe and with an air inlet. Two shutting members are serially mounted and displaceable under the effect of a depression in the water feeding pipe, thereby connecting the water feeding pipe with the open air through the cavity. The two shutting members are composed of deformable membranes having different characteristics. One membrane is thin, supple and is umbrella-shaped, the other is thick and has the shape of a disc.

REFERENCES:
patent: 1755993 (1930-04-01), Kelly et al.
patent: 3633613 (1972-01-01), Julow
patent: 4827538 (1989-05-01), Heimann et al.
patent: 4977920 (1990-12-01), Oberdorfer
patent: 5123437 (1992-06-01), Egli et al.
patent: 5213131 (1993-05-01), Gnauert et al.
patent: 5213268 (1993-05-01), Gnauert et al.

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