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:
May. 23, 1995
Filed:
Jun. 15, 1989
Clifford S Woodward, Bristol, GB;
Rolls-Royce plc, London, GB;
Abstract
This invention provides a valve for diverting fluid flow in a tandem fan type engine. The valve comprises an axially displaceable sleeve 38 which is provided with two circumferentially extending sealing lands 40, 42 which in operation cooperate with two locating surfaces 50, 52 provided on the duct 22 between the first and second compressors 20, 24 of said engine to seal an outlet opening 36. The free unsprung length between the sealing lands 40, 42 is greater than the length between the locating surfaces 50, 52. Gas pressure is used to compress a contractable portion 54 in said sleeve and hence ensure sealing takes place between both pairs of locating surfaces and sealing lands. This apparatus ensures centralisation of the upstream and downstream ends of the sleeve 38 is independently obtainable and accommodates thermal expansion differentials between the sleeve 38 and the duct 22.