The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 12, 1991
Filed:
Mar. 06, 1990
Gary L Goldberg, San Diego, CA (US);
Sam S Navidi, Poway, CA (US);
Wendell E Reed, Chula Vista, CA (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
In order to control fuel flow at a fuel delivery point for auxiliary power units, and for other low fuel flow applications, an altitude-sensitive fuel flow control device (10) includes a fuel inlet (12) in communication with a fuel source and a fuel outlet (14) in communication with a fuel combustor. The device (10) includes an axially extending rod (16) having a metering surface (22) intermediate the ends (24, 26) thereof which may be located in various positions relative to a fuel flow path (18a, 18b, 18c, 18d, 18e) extending from the fuel inlet (12) to the fuel outlet (14) by axial movement of the rod (16) which varies fuel flow within a preselected range of altitude-dependent fuel flow rates. In order to move the axially extending rod (16) to variously position the metering surface (22) relative to the fuel flow path (18a, 18b, 18c, 18d, 18e), an aneroid bellows (28) movable responsive to changes in ambient pressure is interconnected with the axially extending rod (16) and a differential pressure regulaator (52) is in communication with the fuel flow path (18a, 18b, 18c, 18d, 18e) upstream and downstream of the metering surface (22) for maintaining a constant pressure drop independently of altitude.