Sewer pest control check valve

Details Sewer pest control check valve Sewer pest control check valve

1973-09-10

1976-05-11

Schwadron, Martin P.

Fluid handling

Line condition change responsive valves

Direct response valves

137550, F16K 1503

Patent

active

039555968

ABSTRACT:
A sewer pipe valve section comprising a removable one-way check valve and a separate removable screen is provided to be interposed between the building sewer drain system and that of the city. A linkage retains the screen in a normally raised inoperative position when the one-way check valve is in a lowered operative position and permits the screen to be lowered into operative position when the check valve is raised and removed for cleaning the pipe.

REFERENCES:
patent: 891012 (1908-06-01), Shepard
patent: 1354879 (1920-10-01), Boland
patent: 1786597 (1930-12-01), Boosey
patent: 2718238 (1955-09-01), Simko, Sr.
patent: 2925825 (1960-02-01), Staiger
patent: 3720225 (1973-03-01), Wheatley, Jr.

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