Safeguard for a sanitary fitting

Details Safeguard for a sanitary fitting Safeguard for a sanitary fitting

1991-03-04

1993-06-08

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137801, E03C 110

Patent

active

052170403

ABSTRACT:
A first automatic valve of a safeguard is connected in the flow path of a sanitary fitting. The diaphragm, acting as the valve body of a second valve, interacts with the valve seat and the first valve is arranged on said diaphragm. Under normal operating conditions, the second valve is closed and the first valve is opened. Under conditions allowing backflow counter to the direction of the arrow S, the first valve closes automatically, by which action the diaphragm is deformed counter to the direction of the arrow S due to the suction on the input side, which results in the second valve being inevitably opened. By this construction, water is prevented from flowing back into the feedline and the outlet is connected to the ambient air through the opened second valve and the aeration path.

REFERENCES:
patent: 2270737 (1942-01-01), Langdon
patent: 2382427 (1945-08-01), Langdon
patent: 2675823 (1954-04-01), Langdon
patent: 3171423 (1965-03-01), Dillon
patent: 3636968 (1972-01-01), Tine
patent: 3818929 (1974-06-01), Braukmann
patent: 3862640 (1975-01-01), Hechler
patent: 4013088 (1977-03-01), Gocke et al.
patent: 4013089 (1977-03-01), Braukmann
patent: 4726390 (1988-02-01), Franklin
patent: 4977920 (1990-12-01), Oberdorfer

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