Automatic antifreeze back-up valve for sewer

Details Automatic antifreeze back-up valve for sewer Automatic antifreeze back-up valve for sewer

1991-12-10

1992-09-08

Cohan, Alan

Fluid handling

Liquid level responsive or maintaining systems

Electrical characteristic sensing

13762412, 13762413, E03B 112

Patent

active

051449757

ABSTRACT:
A back-up butterfly valve installed in a sewer pipe which will automatically close when sewage water back flows due to heavy rains thereby preventing sewage-laden liquids in the lower levels of residential homes and commercial buildings. The valve is motor actuated and is controlled by a liquid sensor disposed downstream. A clock is utilized to actuate a system by which the valve is opened and closed periodically preventing the valve from sticking or freezing which would leave the valve inoperative.

REFERENCES:
patent: 3202165 (1965-08-01), Yavicoli
patent: 3675248 (1972-07-01), Gaj
patent: 4272640 (1981-06-01), Baumbach
patent: 4392128 (1983-07-01), Young
patent: 4624280 (1986-11-01), De Pirro

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