Backflow prevention device

Details Backflow prevention device Backflow prevention device

1987-12-28

1989-10-03

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137362, F16K 1514

Patent

active

048709921

ABSTRACT:
A backflow prevention device for use in wastelines and the like having a one piece yieldably deformable valving member which permits free flow of liquids in one direction but blocks the flow of liquids and gasses in the opposite direction. Fluid flow through the device is directly proportional to the fluid pressure exerted on the valving member.

REFERENCES:
patent: 194329 (1877-08-01), Buhrer
patent: 803979 (1905-11-01), Bonnell
patent: 2352642 (1944-07-01), Langdon
patent: 2371449 (1945-03-01), Langdon
patent: 3118468 (1964-01-01), Bochan
patent: 3707986 (1973-01-01), Breen

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