Vacuum breakers

Details Vacuum breakers Vacuum breakers

1976-01-19

1977-12-27

Cohan, Alan

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

F16K 1504

Patent

active

040648966

ABSTRACT:
A vacuum breaker, capable of preventing undesired reverse flow of water, includes a hermetically-sealable housing provided with inlet and outlet couplings at its respectively opposite ends. The housing defines a chamber within which is a first valve seat near the inlet coupling and a first valving member disposed in the path of flow between the couplings and cooperative with the first valve seat to block flow from outlet toward inlet. A second valve seat is disposed adjacent to the outlet opening and provides communication between the chamber and the housing exterior. A second valving member is in a position exclusive of the flow path between the inlet and outlet couplings through the first valve seat and serves to selectively block communication between the chamber and the exterior.

REFERENCES:
patent: 2174742 (1939-10-01), Groeniger
patent: 2608412 (1952-08-01), Bletcher et al.
patent: 2664261 (1953-12-01), Stephany
patent: 3083723 (1963-04-01), Duchin
patent: 3155107 (1964-11-01), Woodford
patent: 3171423 (1965-03-01), Dillon
patent: 3171424 (1965-03-01), Shames et al.
patent: 3183924 (1965-05-01), Duchin
patent: 3805828 (1974-04-01), Panagrossi
patent: 3951164 (1976-04-01), Crist

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