Valves and valve actuation – Rotary valves – Butterfly
Patent
1998-08-12
1999-11-09
Douglas, Steven O.
Valves and valve actuation
Rotary valves
Butterfly
251306, 251367, 137375, F16K 122
Patent
active
059798726
ABSTRACT:
A corrosion-resistant volume damper apparatus for use in gas- and vapor-handling duct systems, installed between existing external duct flanges without having to custom cut or otherwise modify the duct system or the volume damper itself. The retrofittable volume damper has a housing or framework with an aperture extending therethrough and a corrosion-resistant damper blade having integral pivot arms. The aperture or bore is of a suitable size and shape to match the duct system within which the volume damper is to be installed. The housing preferably comprises a pair of corrosion-resistant plates of suitably rigid materials. The two plates have a series of through holes permitting the two plates to be bolted together with a damper blade to be rotatably sandwiched between the plates such that one of the pivot arms of the damper blade extends beyond the two plates on a plane perpendicular to, and away from, the axis of the bore. Each of the two plates has substantially semicircular ridges and, optionally, grooves adjacent to the inner edge of the aperture to provide sealing surfaces. The damper blade is rotatably adjustable to partially or completely occlude the bore and is preferably lockable in a desired rotatably adjusted angular position. The housing has standardized attachments allowing the apparatus to be installed between existing flanges on two sections of existing ductwork or against an existing flange on one end of existing ductwork.
REFERENCES:
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patent: 5029811 (1991-07-01), Yamamoto et al.
patent: 5236003 (1993-08-01), Habicht
patent: 5806830 (1998-09-01), Alvarez
Ruffner Shawn P. O.
Stearns David P.
Douglas Steven O.
GDS Manufacturing Co.
Huynh Khoa
Touw Theodore R.
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