Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1991-09-20
1992-11-17
Nilson, Robert G.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137107, F16K 2400
Patent
active
051634651
ABSTRACT:
An improved vacuum breaker valve that uses a sliding shuttle that is held in a first closed position by a compression spring and in a fluid transmitting position by the fluid pressure from the fluid supply with a fluid diverter that directs fluid into a chamber and through a fluid resistor so that the fluid pressure in the chamber can generate forces to slide the shuttle along a fluid diverter until the fluid can flow through the valve with the valve including a resilient spring to force the sliding shuttle to a open vent condition where the valve provides both a physical barrier to backflow as well as a vent to quickly and effectively vent any fluid in the downstream pipes into the atmosphere to protect the fluid supply.
REFERENCES:
patent: 2610859 (1952-09-01), Wilcox
patent: 2939474 (1960-06-01), Simone
patent: 2953153 (1960-09-01), Gaul
patent: 3083723 (1963-04-01), Duchin
patent: 3747626 (1973-07-01), Valentino
patent: 3863665 (1975-02-01), Hechler
patent: 3905382 (1975-09-01), Waterston
patent: 4008732 (1977-02-01), Fichter
patent: 4013088 (1977-03-01), Gocke et al.
patent: 4332274 (1982-06-01), Frisquet
patent: 4518006 (1985-05-01), Hoffmann
patent: 4646775 (1987-03-01), Traylor
patent: 4712575 (1987-12-01), Lair et al.
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