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:
Jul. 30, 1996
Filed:
Jul. 21, 1994
Eugene R Bruun, Simsbury, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A variable area inline valve receives a pressurized fluid and regulates the amount of pressurized fluid flowing through the valve. The valve includes a piston assembly which slides longitudinally along a center line of the valve to control a variable flow area through which the fluid passes to the outlet of the housing. To stabilize the valve, the valve includes an axial feedback passage through which outlet fluid enters and is fed back to a first cavity to provide a retarding force to the piston movement. This fluid feedback assembly allows a proportional amount of the outlet fluid pressure to act on the piston assembly and stabilize the valve by providing a positive spring rate to the valve (i.e., negative feedback). The size of both the feedback orifice and a vent orifice which vents the first cavity to ambient sets the gain of the feedback. The present invention provides a stable, controllable valve which can be used to regulate the amount of bleed air flow from a gas turbine engine to a aircraft thermal anti-ice system.