Back-flow preventer

Details Back-flow preventer Back-flow preventer

1995-03-10

1997-01-14

Rivell, John

Fluid handling

Line condition change responsive valves

Direct response valves

137515, 137518, 137849, F16K 2102, F16K 1514

Patent

active

055929664

ABSTRACT:
The present invention is directed to a multi-cuspid back-flow preventer in the nature of a check valve that has a generally annular body portion with axially spaced upstream and downstream ends. A substantially cylindrical passageway extends through the body portion, and a plurality of circumferentially adjacent valve cuspids are connected to the downstream end of the body portion for selectively opening and closing the passageway that extends therethrough. Each valve cuspid is marginated by a rib that extends into the passageway. Breather slots are provided between the successively adjacent valve cuspids, and a mounting flange may be provided at the upstream end of the body portion.

REFERENCES:
patent: 2347988 (1944-05-01), Burke
patent: 2524764 (1950-10-01), Burke
patent: 2670757 (1954-03-01), Delany
patent: 2850102 (1958-09-01), Brown
patent: 3174434 (1965-03-01), Schieve
patent: 3565106 (1971-02-01), Baumbach
patent: 3861416 (1975-01-01), Wichterle
patent: 4465102 (1984-08-01), Rupp
patent: 4993452 (1991-02-01), Hough
patent: 5324270 (1994-06-01), Kayan et al.

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