Siphon and backflow resistant valve

Details Siphon and backflow resistant valve Siphon and backflow resistant valve

2006-06-26

2009-06-09

Hepperle, Stephen M (Department: 3753)

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

C137S216200, C137S512400, C137S625400

Reexamination Certificate

active

07543599

ABSTRACT:
A valve assembly for preventing backflow and siphoning in a plumbing line, the valve assembly comprising a valve body including a first end having a first aperture for receiving liquid from a supply source, a second end having an exit port for releasing liquid to a demand source, and a second aperture for receiving air. The assembly further includes a variable thickness diaphragm located within a valve chamber having a first and a second portion, the first portion for influencing the flow of liquid in the first aperture and the second portion for influencing the flow of air in the second aperture, the second portion having a flex line for enhancing the amount of flexing provided by the second portion. The first portion further includes a protuberance for enhancing the strength of the diaphragm during low vacuum sealing conditions.

REFERENCES:
patent: 2033467 (1936-03-01), Groeniger
patent: 3857773 (1974-12-01), Du Bois et al.
patent: 3951164 (1976-04-01), Crist
patent: 4508136 (1985-04-01), Kah, Jr.
patent: 4953584 (1990-09-01), Vegso

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