Device for preventing sewage backup in drain lines

Details Device for preventing sewage backup in drain lines Device for preventing sewage backup in drain lines

1982-01-07

1984-02-21

Cohan, Alan

Fluid handling

Liquid level responsive or maintaining systems

By weight of accumulated fluid

137362, 1374875, 138 93, F16K 31128

Patent

active

044323883

ABSTRACT:
A device for automatically preventing the backup of sewage in a gravity discharge drain line consisting of an expansible bladder in conjunction with a reverse flow detector, means for inserting said device to a remote section in said drain line, a pressure source for expanding said bladder to a predetermined pressure to block reverse flow upon signal from said reverse flow detector, electrical and mechanical means for remote automatic operation of said device, said electrical and mechanical means containing elements for return of said device to normal standby position when the backup condition is rectified.
In addition, the device contains a self cleaning feature and means for simulating a backup condition for checking the integrity of the device.

REFERENCES:
patent: 1109740 (1914-09-01), Dehn
patent: 2514040 (1950-07-01), Eksergian
patent: 2549204 (1951-04-01), Kaddatz
patent: 2793371 (1957-05-01), Vesconte
patent: 3086540 (1963-04-01), Anderson

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