Metal working – Method of mechanical manufacture – Valve or choke making
Patent
1997-12-22
1999-11-09
Cuda, Irene
Metal working
Method of mechanical manufacture
Valve or choke making
29890124, B23P 1500
Patent
active
059790539
ABSTRACT:
A butterfly damper for installation in duct work through which air and/or gases will be flowing either under a positive or negative pressure has: an outer cylindrical surface structure made of a strong material; an inner cylindrical surface structure made of a resilient material; a circumferential portion of compressible material, which is always tending to return to the non-compressed form thereof, which is initially compressed between the outer cylindrical surface structure and the inner cylindrical surface structure, whereby the inside diameter of the duct body portion, initially, is uniform throughout the length thereof, and, thereafter, when the initial compressive force becomes less effective, the compressive material expands causing radially inward movement of adjacent circumferential portions of the inner cylindrical surface structure; a blade to be moved across the flow of air and/or gases into sealing contact with the radially inwardly moved circumferential portions of the inner cylindrical surface structure, which have been so moved upon the expansion of the compressible material, to thereby stop the flow of air and/or gases; blade mounting components secured to the outer cylindrical surface; and controllable blade movement components movably secured to the blade mounting components. In a preferred embodiment, the blade is elliptical in shape and is mounted slightly offset on a diagonal about a full shaft positioned on a transverse axis. When the blade is closed in the offset diagonal position thereof, the air and/or gas flow is completely sealed, independent of shaft seals.
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Norris Butterfly Valves--6 Page Brochure-Currently Available in 1995.
Nelson Edgar H.
Nelson Kirk T.
Schaeffer J. Michael
Cuda Irene
Mattern Jr. Roy E.
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