| 摘要 |
A bladed rotor including blading adjustable by a valve-controlled fluid-operable actuator, the actuator and valve being rotatable with the rotor hub. The valve has one element adjustable with respect to the hub and a further element cooperable with the one element to control fluid supply to the actuator. Feedback means connected between the actuator and the further element produce relative movement of the actuator and further element, during which the latter follows up movement of said one element.
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