Pressure equalizing damper

Details Pressure equalizing damper Pressure equalizing damper

1991-05-06

1992-11-10

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137529, 137537, F16K 1704

Patent

active

051615738

ABSTRACT:
A self-adjusting damper device is provided for installation into an air-conveying duct to prevent the development of damaging low pressure within the duct. The device utilizes a panel adapted to occlude an aperture in the duct. Springs hold the panel in a position which normally occludes the aperture. The panel travels toward the interior of the duct in response to low pressure within the duct. The extent of travel of the panel is limited by a retaining member.

REFERENCES:
patent: 2452612 (1948-11-01), Swenberg
patent: 4017026 (1977-04-01), Felter
patent: 4140151 (1979-02-01), Van Becelaere
patent: 4181119 (1980-01-01), Lyles
patent: 4184509 (1980-01-01), Kasper
patent: 4262652 (1981-04-01), Butzen
patent: 4290552 (1981-09-01), Prikkel
patent: 4449512 (1984-05-01), Hebert

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