Automatic air valves for ducts

Details Automatic air valves for ducts Automatic air valves for ducts

1989-11-27

1991-02-12

Michalsky, Gerald A.

Fluid handling

Line condition change responsive valves

Direct response valves

4209FF, 4211, 1372162, 137217, 137545, 137549, 137550, F16K 1712, E03C 1295

Patent

active

049916238

ABSTRACT:
An automatic air valve for a conduit, through which passes fluids and/or solids, which valve prevents the discharge of contaminated air therefrom into the environment and which further permits the introduction of fresh air from the environment into the conduit when a negative pressure develops therein. The valves may be disposed at either the terminus of or interposed within the conduit flow line of a duct system. The valves include an interior filter that restrains foreign objects, such as insects and snakes, in the duct systems from operatively interfering with the proper operation of the valve.

REFERENCES:
patent: 2028581 (1936-01-01), Zinkil
patent: 2096844 (1937-10-01), Cekal
patent: 2216808 (1940-10-01), Delany
patent: 2405241 (1946-08-01), Smith
patent: 4232706 (1980-11-01), Ericson
patent: 4535807 (1985-08-01), Ericson

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