Backflow preventer for sewer system

Details Backflow preventer for sewer system Backflow preventer for sewer system

1978-03-17

1980-08-05

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1514

Patent

active

042157242

ABSTRACT:
A sewer backflow preventer is adapted to fit on the top of a sewer cleanout pipe. The sewer backflow preventer has an upstanding pipe which attaches to the upper most end of the sewer cleanout pipe. Projecting radially from the top of the upstanding pipe are a series of rigid spokes which terminate at and attach to a ring. A cap having an impervious side wall and a top integrally formed with the side wall is attached to the ring near the bottom of the cap. Within the interior of the cap and attached between the ring and the bottom of the cap are a series of flexible rubber straps which radiate inwardly toward the center of the cap. Integrally formed with and attached at the ends of the straps is a half sphere. The convex surface of the sphere faces downward and mates with and reversibly seals the opening of the upstanding pipe. When sewage is backed up in the sewer, the half sphere lifts off the top of the upstanding pipe and allows the sewage to discharge to the ambient environment.

REFERENCES:
patent: 2585863 (1952-02-01), Smith
patent: 3105507 (1963-10-01), Dunmire
patent: 3465786 (1969-09-01), Spisak
patent: 3508576 (1970-04-01), Gross

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