Backward flow prevention device

Details Backward flow prevention device Backward flow prevention device

1997-02-19

1998-05-26

Ferensic, Denise L.

Fluid handling

Line condition change responsive valves

Direct response valves

1374542, F16K 1514

Patent

active

057552630

ABSTRACT:
A backward flow prevention device includes a body through which a fluid passage extends, the fluid passage intersecting an outer periphery of the body to form a fluid port. A flexible tube includes a first end mounted on the outer periphery of the body to extend across the fluid port, and a second, open end. The body is adapted to be mounted in a fluid conducting tube. When fluid flows through the fluid passage and exits the fluid port, it forces the tube away from the fluid port, whereby the fluid can flow through the tube and out the open end thereof. When the fluid flows backwards in the pipe, the fluid pressure causes the tube to be pressed against, and close, the fluid port.

REFERENCES:
patent: 2941541 (1960-06-01), Peras
patent: 2948297 (1960-08-01), Langdon
patent: 2973230 (1961-02-01), Eastburg
patent: 3342208 (1967-09-01), Steffes
patent: 3417775 (1968-12-01), Smith
patent: 3448766 (1969-06-01), Schule
patent: 4134424 (1979-01-01), Zeyra et al.
patent: 5305786 (1994-04-01), Debush

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