Patent ID: 7472885

Claim:
A dual-wall flow passage assembly for a valve, the dual wall flow passage assembly comprising: a valve body constructed at least partially of a non-metallic material and having an outer surface and an inner surface, the valve body inner surface defining a flow passage having at least two flow ports; a sleeve disposed within the valve body flow passage, the sleeve constructed at least partially of a metallic material and having at a flow passage formed therein, the sleeve flow passage in fluid communication with the valve body flow passage flow ports; a plurality of brackets mounted on the valve body outer surface and coupled to the sleeve; and a plurality of ribs formed on the valve body inner surface and extending radially inwardly therefrom, each rib disposed at least proximate an outer surface of the sleeve; and a plurality of fasteners, each fastener coupled between one of the plurality of brackets and the sleeve and extending through the valve body and one of the plurality of ribs; wherein the ribs isolate the valve body from the sleeve and provide redundancy by preventing crack propagation from the valve body to the sleeve.