Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1979-01-11
1980-11-04
Cline, William R.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137107, F16K 2402
Patent
active
042313872
ABSTRACT:
A backflow preventing valve has a body with two principal portions made of a glass-fiber reinforced plastic. One portion has an inlet port and an outlet port on a through axis, the ports opening to an inlet chamber and an outlet chamber respectively. An intermediate chamber merges with the inlet chamber at an inlet valve seat and also merges with the outlet chamber at an outlet valve seat, the valve axes and the through axis being coplanar. Inlet and outlet poppet valves are urged toward their respective seats by springs in the intermediate and the outlet chambers. There is a vent chamber open to the atmosphere and having a vent valve seat merging with the intermediate chamber. A poppet vent valve has a stem movable in a guide toward and away from the vent valve seat. The stem is abutted by a diaphragm disposed between an outer diaphragm chamber and an inner diaphragm chamber and is pressed by a diaphragm spring in the inner diaphragm chamber. There is a first passage extending through the two body portions between the inlet chamber and the outer diaphragm chamber and a second passage extending through the two body portions between the intermediate chamber and the inner diaphragm chamber.
REFERENCES:
patent: 2646064 (1953-07-01), Colton
patent: 3173439 (1965-03-01), Griswold et al.
patent: 3656711 (1972-04-01), Toelke
patent: 3724487 (1973-04-01), Hunter
patent: 3837358 (1974-09-01), Zieg et al.
patent: 3996962 (1976-12-01), Sutherland
patent: 4159025 (1979-06-01), Harthun
Chas. M. Bailey Co., Inc.
Cline William R.
Spiegel H. Jay
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