| 摘要 |
<p>A cam-operated valve mechanism for directing the flow in a fluid flow duct to alternative outlets comprises an annular array of segmented elements (86) which are each pivotally mounted to an axially translatable sleeve (50) disposed coaxially with the duct. In a first axial position the sleeve extends across port and starboard alternative flow outlets (28), and in a second axial position extends downstream thereof. Each valve element comprises a cam follower (90) which engages an axially extending cam track (92a) formed in the duct surface. The profile of the cam track is such that translation of the sleeve from its first to second axial position causes each of the valve elements to rotate from a stowed to a deployed position, and thereby obturate the duct. A second set of valve elements (74) may be provided to close the duct (fig 5), and a third set of valve elements may be provided, linked to a second sleeve (56) upstream of the first sleeve. The valve is used for thrust-vectoring in jet engines. <IMAGE></p> |
