In line back flow preventer

Details In line back flow preventer In line back flow preventer

1978-03-28

1980-11-11

Cline, William R.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137512, 137541, F16K 1506, F16K 4500

Patent

active

042327040

ABSTRACT:
A back flow preventing device which prevents the reverse flow of water from a point of use into a water supply system. The device has a casting with coaxially aligned inlet and outlet openings, and containing coaxially aligned inlet and outlet check valves. The coaxial alignment of the inlet and outlet openings, and of the inlet and outlet check valves serves to minimize the pressure drop through the device. Between the inlet and outlet check valves is a diaphragm actuated relief valve which opens to drain the passage between the check valves if they should malfunction or if there is a drop in the supply line pressure sufficient to cause actual or potential reverse flow back toward the supply line.

REFERENCES:
patent: 2389413 (1945-11-01), Carlton
patent: 2503424 (1950-04-01), Snyder
patent: 2706488 (1955-04-01), Harrington
patent: 3448763 (1969-06-01), Curtiss
patent: 3636968 (1972-01-01), Tine
patent: 3747621 (1973-07-01), Tine
patent: 4054153 (1977-10-01), Guyton
patent: 4090527 (1978-05-01), Sutherland
patent: 4129144 (1978-12-01), Andersson

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