| http://www.w3.org/ns/prov#value | - A valve according to claim 5 wherein the valve is a check valve to permit the flow of exhausted fluid from at least one of the first and second sides of a movable member of an actuator of a hydraulic system which includes an actuator which is extendible and retractable to operate landing gear of an aircraft, the actuator including a casing, the movable member being moved relative to the casing in
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