Back flow valve

Details Back flow valve Back flow valve

1982-08-12

1985-01-22

Cohan, Alan

Fluid handling

Liquid level responsive or maintaining systems

By float controlled valve

251 5, F16K 3134

Patent

active

044943458

ABSTRACT:
A sewer back flow valve having sensing means located at the top of the sewer line and an inflatable annular bladder responsive to a sensing means to permit passage of sewage through the annular bladder under normal water level conditions and operable to prevent back flow of sewage through the annular bladder under high water level conditions.

REFERENCES:
patent: 1991081 (1935-02-01), Charpier
patent: 2756959 (1956-07-01), Hill
patent: 3145967 (1964-08-01), Gardner
patent: 4268005 (1981-05-01), Raftis et al.

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