Duckbill conservation vent valve

Details Duckbill conservation vent valve Duckbill conservation vent valve

1991-10-28

1993-03-16

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137847, F16K 1514

Patent

active

051935856

ABSTRACT:
The present invention relates to a duckbill conservation vent valve comprising an elastomeric tubular body having an axial fluid passageway with an inlet and an outlet. The tubular body progressively narrows in cross section from inlet to outlet, forming opposed sealing lips at the outlet. The lips define a closed slit therebetween. The slit is opened in response to pressure exerted from the inlet in the direction of the slit. The slit is kept closed by means such as applying either external or internal force on opposing ribs which extend radially from the tubular body or by draping a long lip over a slit and a short lip, or by stretching a short lip to equal the length of a long lip and attaching the short lip to the long lip. The duckbill conservation vent valve is capable of being opened by pressure heads of less than about 2 inches of water.

REFERENCES:
patent: 3133696 (1964-05-01), Mirando
patent: 3565106 (1971-02-01), Baumbach
patent: 3967645 (1976-07-01), Gregory
patent: 4341239 (1982-07-01), Atkinson

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