Backwater escape valve

Details Backwater escape valve Backwater escape valve

1989-06-21

1990-04-17

Rivell, John

Fluid handling

Systems

System with plural openings, one a gas vent or access opening

1375276, 4211, F16L 5507

Patent

active

049171470

ABSTRACT:
A backwater escape valve for plumbing systems comprising a cylindrical body adapted to be coupled to a drainpipe system at the opening normally occupied by a sealing plug, and having a vertically disposed outflow opening covered with a hinged, spring-loaded cover which is adapted to be forced open when the associated sewer becomes blocked and water rises in the associated vertical drainpipe to or near the lowest sink or bathtub coupled thereto.

REFERENCES:
patent: 168517 (1875-10-01), Morrell
patent: 480374 (1892-08-01), Seeback
patent: 1553940 (1925-09-01), Kangieser
patent: 1763562 (1930-06-01), Mulder
patent: 1978507 (1934-10-01), Rand
patent: 2602168 (1952-07-01), Lally et al.
patent: 2766841 (1956-10-01), King
patent: 2908286 (1959-10-01), Hallstrom
patent: 3805826 (1974-04-01), Westerhoff
patent: 3815629 (1974-06-01), Oberholtzer
patent: 3852836 (1974-10-01), Oberholtzer
patent: 3941151 (1976-03-01), Biddle
patent: 4039004 (1977-08-01), Luthy
patent: 4261386 (1981-04-01), Young
patent: 4475571 (1984-10-01), Houston, Jr. et al.
patent: 4700732 (1987-10-01), Francisco

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