Isolating damper for closing a duct

Details Isolating damper for closing a duct Isolating damper for closing a duct

1973-11-14

1976-04-20

O'Dea, William F.

Stoves and furnaces

Dampers

Electric

98 41R, 251 58, 251 86, 251138, 251299, 251333, F23L 300, F23L 1102, F23L 1310

Patent

active

039511308

ABSTRACT:
An isolating valve or damper for the gas-tight closure of a flue or duct, comprising a frame or housing fitted in the flue or duct and a closure member operable between an open position and a closed position in which the member closes the flue or duct, wherein the closure member is a lightweight low inertia body, preferably a cone or a sphere, and wherein the closure member may be moved between its open and closed positions by means of a rapid-acting operator.

REFERENCES:
patent: 2033398 (1936-03-01), Rogers
patent: 2121707 (1938-06-01), McGee
patent: 2224705 (1940-12-01), Stringer
patent: 2660396 (1953-11-01), Haegerty
patent: 3010692 (1961-11-01), Jentoft
patent: 3035810 (1962-05-01), Lowe et al.
patent: 3290001 (1966-12-01), Taylor

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