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:
Mar. 31, 2015
Filed:
Apr. 15, 2011
Bastien Dore, Paris, FR;
Loïc Pora, Champagne sur Seine, FR;
Bastien Dore, Paris, FR;
Loïc Pora, Champagne sur Seine, FR;
SNECMA, Paris, FR;
Abstract
A jet pump () is inserted between the low-pressure pump and a high-pressure fuel pump (). A fuel metering unit () includes a metering valve () which delivers a regulated fuel flow to a feed line (), and a bypass valve () which diverts to a primary intake () of the jet pump the excess fuel flow supplied by the high-pressure pump. An overspeed protection unit () includes a control element () of the bypass valve () which causes said to fully open in the event of an overspeed of the engine. A shutoff and pressurization checkvalve () is mounted on the feed line and controlled by a servo-valve () having a high-pressure port () brought to the high fuel pressure, a low-pressure port brought to the pressure of the primary intake () of the jet pump and an output setting the pressure in a control chamber () of the shutoff valve () to a value between those prevailing at the high pressure and low pressure ports. In the event of overspeed, the restriction imposed by the jet pump causes a pressure rise at the primary intake of the jet pump, hence a pressure rise in the control chamber of the shutoff valve (), favoring the closing thereof.