Automatic air valve device for ducts

Details Automatic air valve device for ducts Automatic air valve device for ducts

1983-11-21

1985-08-20

Cohan, Alan

Fluid handling

Line condition change responsive valves

Direct response valves

13753329, 137526, F16K 1508, F16K 1712

Patent

active

045358079

ABSTRACT:
The device includes a tubular body, an annular flap cooperating with the tubular body, and a cover cooperating with the tubular body to form a channel or peripheral air inlet beneath the annular flap, which channel is closed by the latter. When a partial vacuum occurs in the conduit connected to the device, the annular flap is raised by the incoming ambient air upwardly and into the internal space defined by the inner periphery of the cover. The annular flap is provided with external guiding lugs oriented downwardly and which cooperate with ribs integrally formed on the outside of the tubular body.

REFERENCES:
patent: 711304 (1902-10-01), George
patent: 1578766 (1926-03-01), Schwemlein
patent: 3092139 (1963-06-01), Rodgers et al.
patent: 3210056 (1965-10-01), Sant
patent: 3513875 (1970-05-01), Nelson
patent: 3862281 (1975-01-01), Uchiyama
patent: 4224044 (1980-09-01), King
patent: 4232706 (1980-11-01), Ericson
patent: 4436107 (1984-03-01), Persson

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