Vacuum relief door assembly

Details Vacuum relief door assembly Vacuum relief door assembly

1977-06-24

1979-02-20

Cline, William R.

Fluid handling

Line condition change responsive valves

Direct response valves

137559, F16K 1704

Patent

active

041401514

ABSTRACT:
A vacuum relief and access door assembly, for use on a duct downstream of a fire or control dampers, comprises a frame including a duct facing surface with a seal member thereon, a closure member having side edges in sealing engagement with the seal member, and removable retaining members mounted on the frame and resiliently urging the closure member into sealing engagement with the seal member, yielding to allow the closure member to displace toward the duct to allow air flow thereby for vacuum relief and returning into sealing engagement with the seal member.

REFERENCES:
patent: 1511610 (1924-10-01), Holmes
patent: 2224287 (1940-12-01), Busch
patent: 2452612 (1948-11-01), Swenberg
patent: 3782411 (1974-01-01), Turner

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