Sewer line relief valve

Details Sewer line relief valve Sewer line relief valve

1991-01-07

1991-07-16

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137360, 1375278, 4211, F16K 1503

Patent

active

050316591

ABSTRACT:
A backwater escape valve comprises a threaded shank received in the threaded opening of a clean out. A pivotally mounted valve body provides a frustoconical valve element and is biased by a spring or by gravity into a closed position against a mirror image frustoconical valve seat. Means are provided to limit opening movement of the valve body in a range of 20.degree.-60.degree. away from the valve seat. The valve seat member is configured to be fully opening and of maximum internal diameter.

REFERENCES:
patent: 3815629 (1974-06-01), Oberholtzer
patent: 4039004 (1977-08-01), Luthy
patent: 4917147 (1990-04-01), Jerkins

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